Attachment 6 - SAE-AMS 3144.pdf

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.

Copyright © 2019 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerService@sae.org SAE WEB ADDRESS: http://www.sae.org

SAE values your input. To provide feedback on this Technical Report, please visit http://standards.sae.org/AMS3144A

AEROSPACE

MATERIAL SPECIFICATION

AMS3144™ REV. A

Issued 2012-11 Revised 2019-10

Superseding AMS3144

(R) Primer, Anodic Electrodeposition for Aircraft Applications

RATIONALE

Revision A constitutes the Five-Year Review and update of this standard. The table below details the technical changes to the specification.

TECHNICAL CHANGES

Section Change Reason for Change

1.3 Added Grades 1, 2, and 3 To allow for broader use over different pretreatments 2.1 4.7.5.4.1 4.7.5.4.2

Added AMS3721 Inclusion of new tape specification

3.4 Changed heading from Storage Stability to Shelf Life To conform to current template

3.4.1 Addition of definition of Storage Stability To conform to current template

3.5.3 Lowered DFT from 0.7 to 0.6 mil To better match industry specifications

4.4.1 Addition of template language To conform to current template

4.4.3 Added new section - shelf life extension tests New requirement

4.6.3 Added laboratory certification

Added recertification tests Adding requirement for qualified laboratory New requirement

4.7.3.1 Panels A & D - removed Class 1A

Panel B - removed MIL-A-8625 reference and replaced with Deoxidizer

To match new grade classification To allow for better consistency of surface treated panels

Downloaded from SAE International by Nicolas Castellanos, Wednesday, December 11, 2019 http://standards.sae.org/AMS3144A

SAE INTERNATIONAL AMS3144™A Page 2 of 17

1. SCOPE

1.1 Form

This specification establishes the requirements for a waterborne, corrosion inhibiting, chemical and solvent resistant, anodic electrodeposition epoxy primer capable of curing at 200 to 210 °F (93 to 99 °C).

1.2 Application

The primers covered by this specification are typically applied as base primers on military, general aviation, and commercial aircraft aluminum surfaces to protect against corrosion. They are suitable for use in a service temperature range from -65 to 250 °F (-54 to 121 °C).

1.3 Classification

The primers covered by this specification shall be classified as follows:

Type 1 - Standard pigments Type 2 - Low IR (Infrared) pigments

Class C - Chromated - contains chromium-based corrosion inhibitors Class N - Chrome-Free - contains no chromium-based corrosion inhibitors

Grade 1 - For use with hexavalent chrome conversion coating Grade 2 - For use with non-hexavalent chromate conversion coating Grade 3 - For use with cleaned and deoxidized only

1.4 Safety - Hazardous Materials

While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org.

AMS1640 Corrosion Removing Compound for Aircraft Surfaces

AMS2629 Fluid, Jet Reference

AMS3277 Sealing Compound, Polythioether Rubber, Fast Curing for Integral Fuel Tanks and General Purpose, Intermittent Use to 360 °F (182 °C)

AMS3721 Tape for Organic Coating Adhesion Testing http://www.sae.org/

SAE INTERNATIONAL AMS3144™A Page 3 of 17

AMS-QQ-A-250/4 Aluminum Alloy 2024, Plate and Sheet

AMS-QQ-A-250/5 Aluminum Alloy Alclad 2024, Plate and Sheet

AMS-S-8802 Sealing Compound, Fuel Resistant, Integral Fuel Tanks and Fuel Cell Cavities

AS1241 Fire Resistant Phosphate Ester Hydraulic Fluid for Aircraft

AS5127/1 Aerospace Standard Test Methods for Aerospace Sealants Two-Component Synthetic Rubber Compounds

AS9100 Quality Management System - Requirements for Aviation, Space and Defense Organizations

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610- 832-9585, www.astm.org.

ASTM B117 Standard Practice for Operating Salt Spray (Fog) Apparatus

ASTM D329 Standard Specification for Acetone1, 2

ASTM D522 Standard Test Methods for Mandrel Bend Test of Attached Organic Coatings

ASTM D740 Standard Specification for Methyl Ethyl Ketone1, 2

ASTM D1974 Standard Practice for Methods of Closing, Sealing, and Reinforcing Fiberboard Boxes

ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity

ASTM D2794 Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)

ASTM D3335 Standard Test Method for Low Concentrations of Lead, Cadmium, and Cobalt in Paint by Atomic Absorption Spectroscopy

ASTM D3359 Standard Test Methods for Rating Adhesion by Tape Test

ASTM D3363 Standard Test Method for Film Hardness by Pencil Test

ASTM D3960 Standard Practice for Determining Volatile Organic Compound (VOC) Content of Paints and Related Coatings

ASTM D5402 Standard Practice for Assessing the Solvent Resistance of Organic Coatings Using Solvent Rubs

ASTM D7091 Standard Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals

ASTM E1613 Standard Test Method for Determination of Lead by Inductively Coupled Plasma Atomic Emission Spectrometry (FAAS), or Graphite Furnace Atomic Absorption Spectrometry (GFAAS) Techniques

ASTM F22-13 Standard Test Method for Hydrophobic Surface Films by the Water-Break Test

ASTM G85 Standard Practice for Modified Salt Spray (Fog) Testing http://www.astm.org/

SAE INTERNATIONAL AMS3144™A Page 4 of 17

2.3 U.S. Government Publications

Copies of these documents are available online at https://quicksearch.dla.mil.

MIL-DTL-5541 Chemical Conversion Coatings on Aluminum and Aluminum Alloys

MIL-PRF-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base

MIL-PRF-23377 Primer Coatings: Epoxy, High Solids

MIL-PRF-23699 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base, NATO Code Number O-152, O-154, O-156 and O-167

MIL-PRF-81733 Sealing and Coating Compound, Corrosion Inhibitive

MIL-PRF-83282 Hydraulic Fluid, Fire Resistant, Synthetic Hydrocarbon Base, Aircraft, Metric, NATO Code Number H-537

MIL-PRF-85285 Coating: Polyurethane, Aircraft and Support Equipment

MIL-PRF-85582 Primer Coatings, Epoxy, Waterborne

TT-R-2918 Remover, Paint, No Hazardous Air Pollutants (HAPS)

2.4 PRI Publications

Available from Performance Review Institute, 161 Thorn Hill Road, Warrendale, PA 15086-7527, Tel: 724-772-1616, www.pri-network.org.

PD2000 Governance and Administration of an Industry Managed Product Qualification Program

PD2001 Manufacturer Request for Product Approval and Qualification Process

PRI-QPL-AMS3144 Products Qualified Under AMS3144

2.5 ISO Publications

Copies of these documents are available online at http://webstore.ansi.org/.

ANSI Z400.1/Z129.1 Hazardous Workplace Chemicals - Hazard Evaluation and Safety Data Sheet and Precautionary Labeling Preparation

ISO/IEC 17025 General Requirements for the Competence of Testing and Calibration Laboratories

ISO 9001 Quality Management Systems - Requirements

ISO 11890-1 Paints and Varnishes - Determination of Volatile Organic Compound (VOC) Content - Part 1:

Difference Method

3. TECHNICAL REQUIREMENTS

3.1 Materials

The primer shall be formulated in accordance with the manufacturer’s material specification for anodic electrodeposition primer such that it meets the performance requirements set forth in this specification.

https://quicksearch.dla.mil/ http://www.pri-network.org/ http://webstore.ansi.org/

SAE INTERNATIONAL AMS3144™A Page 5 of 17

3.1.1 Composition

3.1.1.1 Resin Feed Component

The resin feed component shall consist of epoxy or epoxy-urethane resin combined with flow control agents and volatile solvents.

3.1.1.2 Pigment Paste Component

The pigment paste component shall consist of a resin combined with pigments, extenders, and volatile solvents.

3.1.1.3 Characteristics

The following characteristics (expressed as tolerance ranges) of the resin feed and pigment paste components shall be established and reported by the manufacturer at the time of initial process approval.

a. Total solids, percent by weight

b. Weight per gallon

c. pH range (resin feed only)

d. Viscosity, centipoise

e. Condition in container

3.1.1.4 Mixed Primer

The following characteristics (expressed as tolerance ranges) of the mixed primer shall be established and reported by the manufacturer at the time of initial process approval.

a. Total solids, percent by weight

b. Pigment/binder content

c. pH range

d. Conductivity, micromhos

e. Volatile organic compounds (VOC), lb/gal (g/l)

f. Cure time and temperature

g. Dry film thickness

3.1.2 Prohibited Materials

The primer shall contain no more than 10 ppm lead or cadmium when tested per ASTM D3335 or equipment referenced in ASTM E1613. Class N primer shall additionally contain no intentionally added chromium compounds.

3.1.3 Toxicity

The primer shall have no adverse effect on the health of personnel when used for its intended purpose in accordance with manufacturer's instructions and with appropriate handling procedures and precautions per the material safety data sheet (see 4.8.2).

SAE INTERNATIONAL AMS3144™A Page 6 of 17

3.2 Odor

The odor of the primer components and the mixed primer shall not be obnoxious nor cause discomfort to personnel during mixing or application.

3.3 VOC Content

The volatile organic compound (VOC) content of the mixed primer shall be reported in lb/gal and g/l on the qualification test report when tested in accordance with ASTM D3960 (calculate using Paragraph 10.2 and Appendices X2 and X3) and ISO 11890-1 (calculate using Method 3).

3.4 Shelf Life and Storage

3.4.1 Shelf Life

The primer components (resin feed and pigment paste), in its original packaged and unopened condition, shall meet all the requirements in this specification for a period of 12 months from date of manufacture when stored in a temperature range of 60 to 90 °F (15 to 32 °C). For shelf life extension requirements, see to 4.4.3.

3.4.2 Storage Stability

The primer components, after storage in the original, unopened containers for the required shelf life, shall conform to all requirements of this specification.

3.5 Properties

The primer, when prepared in accordance with the manufacturer’s instructions, shall conform to the requirements shown in Table 1, determined in accordance with the specified test methods.

Table 1 - Properties

Paragraph Property Test Requirement

3.5.1 Quality Visual

3.5.2 Color Visual

3.5.3 Thickness 4.7.5.1

3.5.4 Hardness 4.7.5.2

3.5.5.1 Flexibility - Impact Resistance 4.7.5.3.1

3.5.5.2 Flexibility - Low Temperature 4.7.5.3.2

3.5.5.3 Flexibility - Elongation 4.7.5.3.3

3.5.6.1 Adhesion - Wet Tape Test 4.7.5.4.1

3.5.6.2 Adhesion - Dry Tape Test 4.7.5.4.2

3.5.7.1 Compatibility - Topcoats 4.7.5.5.1

3.5.7.2 Compatibility - Repair Primer 4.7.5.5.2

3.5.7.3 Compatibility - Sealant Adhesion 4.7.5.5.3

3.5.8 Fluid Resistance 4.7.5.6

3.5.9 Humidity Resistance 4.7.5.7

3.5.10 Solvent Resistance 4.7.5.8

3.5.11.1 Corrosion Resistance - Neutral Salt Spray 4.7.5.9.1

3.5.11.2 Corrosion Resistance - Filiform 4.7.5.9.2

3.5.11.3 Corrosion Resistance - Sulfur Dioxide Salt

Spray 4.7.5.9.3

3.5.12 Infrared Reflectance (Type 2 only) 4.7.5.10

3.5.13 Rain Erosion Resistance 4.7.5.11

3.5.14 Strippability 4.7.5.12

SAE INTERNATIONAL AMS3144™A Page 7 of 17

3.5.1 Quality

The primer components (resin feed and pigment paste) shall be uniform in quality and condition, free of grit, seeds, lumps, abnormal thickening or livering. The components shall not show pigment flotation nor excessive settling, and shall mix to a smooth, homogeneous, and pourable condition.

3.5.2 Color

The mixed primer shall exhibit the colors per Type as follows:

3.5.2.1 Type 1 shall be the natural color of the final mixed material.

3.5.2.2 Type 2 shall be dark green, dark grey, or black in color determined by the low infrared pigments used.

3.5.3 Thickness

The dry film thickness of the thermally cured primer (as defined in 4.7.5.1) shall be in the range of 0.6 to 1.2 mils when tested in accordance with 4.7.5.1.

3.5.4 Hardness

The scratch hardness shall be a minimum pencil hardness of F when tested in accordance with 4.7.5.2.

3.5.5 Flexibility

3.5.5.1 Impact Resistance

The primer shall exhibit no cracking or loss of adhesion at 50 in-lb forward and 40 in-lb reverse when tested in accordance with 4.7.5.3.1.

3.5.5.2 Low Temperature Flexibility

The primer shall exhibit no cracking or delamination under visual examination when bent over a mandrel in accordance with 4.7.5.3.2.

3.5.5.3 Elongation

The primer shall exhibit an elongation of not less than 10% when tested in accordance with 4.7.5.3.3.

3.5.6 Adhesion

3.5.6.1 Wet Tape Test

The primer must have a rating of no less than 4B when tested in accordance with 4.7.5.4.1.

3.5.6.2 Dry Tape Test

The primer must have a rating of no less than 4B when tested in accordance with 4.7.5.4.2.

3.5.7 Compatibility

3.5.7.1 Topcoats

The top coated primer shall pass the adhesion requirements of 3.5.6 when tested in accordance with 4.7.5.5.1, using MIL-PRF-85285, Type I or IV Class H polyurethane topcoat.

SAE INTERNATIONAL AMS3144™A Page 8 of 17

3.5.7.2 Repair Primer

The repair primer shall pass the adhesion requirements of 3.5.6 when tested in accordance with 4.7.5.5.2, using MIL-PRF- 23377, Type I, Class C2 or MIL-PRF-85582, Type I, Class C2 primer.

3.5.7.3 Sealant Adhesion

The sealant shall have an average peel strength of at least 20 lb-in of width with no value lower than 15 lb-in of width. The separation during peel shall be at least 95% cohesive in sealant. Tests shall be in accordance with 4.7.5.5.3 using AMS-S- 8802 sealant, MIL-PRF-81733 Type II sealant, and AMS3277 sealant.

3.5.8 Fluid Resistance

When tested in accordance with 4.7.5.6, the primer shall withstand immersion in the fluids and conditions listed below with a pencil hardness no softer than HB and without any failures such as blistering, cracking, or peeling.

1. Hydraulic Fluid MIL-PRF-83282: 30 days 75 °F ± 5 °F (24 °C ± 3 °C)

2. Lubricating Oil MIL-PRF-7808: 14 days at 75 °F ± 5 °F (24 °C ± 3 °C)

3. Lubricating Oil MIL-PRF-23699: 14 days at 75 °F ± 5 °F (24 °C ± 3 °C)

4. Hydraulic Fluid MIL-H-5606: 14 days at 75 °F ± 5 °F (24 °C ± 3 °C)

5. Fluid, Jet Reference, AMS2629 Type 1: 14 days at 75 °F ± 5 °F (24 °C ± 3 °C)

6. Fire Resistant Phosphate Ester Hydraulic Fluid, AS1241: 14 days at 75 °F ± 5 °F (24 °C ± 3 °C)

3.5.9 Humidity Resistance

The primer shall not blister, soften, or peel after exposure for 30 days in a humidity chamber at 95% ± 5% relative humidity and 120 °F ± 5 °F (49 °C ± 3 °C) when tested in accordance with 4.7.5.7.

3.5.10 Solvent Resistance (Cure)

The primer shall withstand 200 passes (100 back and forth rubs) by a cloth rag soaked in ASTM D740 methyl ethyl ketone (MEK) or ASTM D329 acetone when tested in accordance with 4.7.5.8. Rubbing through to bare substrate constitutes failure of the primer.

3.5.11 Corrosion Resistance

3.5.11.1 Neutral Salt Spray

The primer, with and without a topcoat, shall exhibit no blistering or loss of adhesion beyond 0.125 inches from scribe line after exposure to a 5% salt spray for 3000 hours when tested in accordance with 4.7.5.9.1. There shall be no corrosion products or pitting in the scribe for Class C. There shall be no pitting in the scribe for Class N, but some discoloration and corrosion products are acceptable.

3.5.11.2 Filiform

The primer, with and without topcoat, shall exhibit no filiform corrosion extending beyond 0.25 inches from the scribe (outside of the upper edge of the grid), and no more than a rating of 60 squares in the outer grid after exposure for 1000 hours when tested in accordance with 4.7.5.9.2.

SAE INTERNATIONAL AMS3144™A Page 9 of 17

3.5.11.3 Sulfur Dioxide Salt Spray

The primer shall exhibit no blistering or loss of adhesion beyond 0.125 inches from the scribe line after exposure to sulfur dioxide salt spray for 500 hours when tested in accordance with 4.7.5.9.3. There shall be no corrosion or pitting in the scribe for Class C. There shall be no pitting in the scribe for Class N but some discoloration and corrosion products are acceptable.

3.5.12 Infrared Reflectance (Type 2 only)

The total reflectance (specular and diffuse) of the Type 2 primer, relative to barium sulfate, shall be no greater than 10% throughout the range of 700 to 2600 nm when tested in accordance with 4.7.5.10.

3.5.13 Rain Erosion Resistance

The top coated primer shall have maximum peel of 0.25 inches from the edge and shall have no erosion to substrate when tested in accordance with 4.7.5.11.

3.5.14 Strippability

A minimum of 90% of the primer shall be stripped when tested in accordance with 4.7.5.12.

4. QUALITY ASSURANCE PROVISIONS

4.1 Qualification of Primer

Qualification is the process by which material properties of a primer are verified through testing at a certified laboratory prior to inclusion on a qualified products list (QPL). All primers sold to this specification shall be listed, or approved for listing, on an approved QPL in accordance with PD2000 and PD2001.

4.1.1 Qualified Products Lists

PRI-QPL-AMS3144 is the approved QPL managed by the Performance Review Institute (PRI), 161 Thorn Hill Road, Warrendale, PA 15086-7527, phone (724) 772-1616, fax (724) 772-1699. Information pertaining to qualification of primer may be obtained from PRI.

4.1.2 Contract Awards

Awards will be made only for primers which are, prior to the award of contract, QPL approved.

4.2 Quality System of Manufacturer

Before submitting a primer for qualification to this specification for the purpose of being listed on the QPL, the manufacturer shall have a quality system in place which holds a third-party accreditation to ISO 9001 or AS9100.

4.3 Responsibility for Testing

The manufacturer of the primer shall supply all samples needed and shall be responsible for the performance of all required tests of this specification

4.4 Classification of Tests

4.4.1 Qualification Tests

All technical requirements of this specification (see Section 3) are qualification tests. Conformance to these requirements shall be established prior to QPL approval. All qualification testing shall be carried out by a laboratory which is independent of the manufacturer and is accredited per ISO 17025 with a Scope of Accreditation that is approved by the G-8 Qualified Products Group (QPG).

SAE INTERNATIONAL AMS3144™A Page 10 of 17

4.4.2 Acceptance Tests

The technical requirements shown in Table 2 are acceptance tests. Conformance to these requirements shall be established on each batch of feed material (resin and paste). Unless otherwise specified herein, acceptance testing may be carried out by a laboratory of the manufacturer's choosing.

Table 2 - Acceptance tests

Paragraph Property Test Requirement

3.5.1 Quality Visual

3.5.2 Color Visual

4.4.3 Shelf Life Extension Tests

The technical requirements shown in Table 2 shall be used to extend the shelf life of the primer components by the manufacturer. If the primer components are stored within the requirements of 3.4.1, an additional 6 months extension can be granted. A maximum of two extensions can be issued for each primer component.

4.5 Sampling and Testing

Shall be as follows:

4.5.1 Qualification Tests

Manufacturer will supply primed panels from a single batch of mixed primer. Test panels will be prepared in accordance with 4.7.3 and 4.7.4. Samples shall be identified as follows and forwarded to the laboratory responsible for testing:

PRIMER, ANODIC ELECTRODEPOSITION FOR AIRCRAFT APPLICATIONS

FOR CORROSION INHIBITION, CHEMICAL AND SOLVENT RESISTANCE

AMS3144A, TYPE (1 OR 2) CLASS (C OR N) GRADE (1, 2, or 3)

MANUFACTURER’S IDENTIFICATION

NAME OF MANUFACTURER

BATCH NUMBER OF RESIN FEED AND PIGMENT PASTE

DATE OF MANUFACTURE OF MIXED PRIMER

SUBMITTED BY (NAME) (DATE) FOR QUALIFICATION TESTS IN ACCORDANCE WITH AMS3144A

4.5.2 Acceptance Tests

Samples shall consist of sufficient resin feed and pigment paste taken at random from each batch to perform the required tests. A batch shall be the quantity of material run through a mill or mixer at one time.

4.5.2.1 A statistical sampling plan, acceptable to purchaser, may be used in lieu of sampling as in 4.5.2.

4.6 Approval, Reapproval, and Recertification

Approval of qualification test results, reapproval, and recertification of qualification for QPL listing shall be in accordance with PD2000 and PD2001, unless otherwise specified herein. Data shall be reviewed by the G-8 Qualified Products Group

(QPG).

4.6.1 Approval

Manufacturer shall submit qualification test data to PRI for approval by the G-8 QPG. Qualification will be valid until such time that the conditions in 4.6.2 or 4.6.3 occur, or unless qualification is withdrawn per the conditions set forth in PD2000 and PD2001.

SAE INTERNATIONAL AMS3144™A Page 11 of 17

4.6.2 Reapproval

Manufacturer shall use ingredients of the same CAS #, manufacturing procedures, processes, and methods of inspection on production resin feed and pigment paste that is the same as those used on the qualification sample. If necessary to make any change in product formulation, raw materials, basic methods of processing, or plant site, manufacturer shall submit for reapproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample resin feed and pigment paste. Production resin feed or pigment paste made by the revised procedure shall not be shipped prior to receipt of reapproval by the G-8 QPG.

4.6.2.1 A review of the submitted changes may result in reapproval without testing, reapproval after partial requalification testing, or reapproval after full requalification testing.

4.6.3 Recertification

Recertification of qualification is required every 5 years. Recertification consists of a letter certifying that there have been no changes in the material ingredients, manufacturing processes, or site of production since qualification, and that the primer meets all of the requirements of this specification. In addition, a test report shall be provided from an ISO 17025 certified laboratory in accordance with 4.4.1, showing compliance with the recertification tests listed in Table 3.

Table 3 - Recertification properties

Paragraph Property Test Requirement

3.5.5.1 Flexibility - Impact Resistance 4.7.5.3.1

3.5.6.1 Adhesion - Wet Tape Test 4.7.5.4.1

3.5.6.2 Adhesion - Dry Tape Test 4.7.5.4.2

3.5.11.1 Corrosion Resistance - Neutral Salt Spray 4.7.5.9.1

3.5.11.2 Corrosion Resistance - Filiform 4.7.5.9.2

4.7 Test Methods

Testing shall be as follows:

4.7.1 Standard Test Conditions

Standard laboratory conditions shall be 77 °F ± 2 °F (25 °C ± 1 °C) and 50% ± 5% relative humidity. Unless otherwise specified herein, all test specimens shall be cured and tested under these conditions.

4.7.2 Standard Tolerances

Unless otherwise specified herein, standard tolerances shown in Table 4 shall be applied throughout the test methods.

Table 4 - Standard tolerances

Measurement Units Tolerance Temperatures ±2 °F (±1 °C) Days ±2 hours Hours ±5 minutes Minutes ±10 seconds Inches (mm) ±0.010 inch (0.25 mm)

4.7.3 Preparation of Test Panels

4.7.3.1 Description of Test Panels

Unless otherwise specified herein, all test panels shall be 0.020 x 3 x 6 inches of the panel type conforming to Table 5.

Panels shall be cut to the required dimensions prior to chemical treatment.

SAE INTERNATIONAL AMS3144™A Page 12 of 17

Table 5 - Aluminum test panels

Panel Substrate Pretreatment A AMS-QQ-A-250/4 (T3) Grades 1 & 2 MIL-DTL-5541, Type I or

Type II, and Grade 3 Deoxidized 1/ B AMS-QQ-A-250/4 (TO) Deoxidized 1/ C AMS-QQ-A-250/5 (T3) Deoxidized 1/ D AMS-QQ-A-250/5 (T3) Grades 1 & 2 MIL-DTL-5541, Type I or

Type II, & Grade 3 Deoxidized 1/

1/ Clean test panel in accordance with 4.7.3.2, following cleaning immerse test panel in a corrosion removing compound conforming to AMS1640, then remove test panel and rinse with distilled water. Apply the primer within 1 hour.

4.7.3.2 Cleaning of Test Panels

Unless otherwise specified herein, all test panels shall be mechanically or chemically cleaned such that a water break-free surface as described ASTM F22-13 is obtained after rinsing.

4.7.4 Preparation of Test Specimens

Unless otherwise specified herein, all materials utilized in test specimen preparation shall be prepared and cured according to manufacturer’s instructions. The MIL-PRF-85285, Type I or IV Class H polyurethane topcoat (when needed) shall be applied to a dry film thickness of 1.7 to 2.3 mils.

4.7.4.1 Scribing

Test specimens that require an X scribe shall be machined to the dimensions below utilizing a New Hermes IS 6000 or equivalent engraving machine and cutter as described in Figure 1. The scribe must penetrate all coatings, pretreatment, and clad layer (if Alclad), as indicated by Figure 1 dimensions.

Figure 1 - Panel scribe requirements

4.7.5 Test Procedures

4.7.5.1 Thickness

The test panels shall be prepared in accordance with 4.7.3 and 4.7.4 using Panel A specimens as in Table 5. The thickness shall be tested in accordance with ASTM D7091.

4.7.5.2 Hardness

The test panels shall be prepared in accordance with 4.7.3 and 4.7.4 using Panel A specimens as in Table 5. The primer hardness shall be tested in accordance with ASTM D3363.

SUBSTRATE

TOPCOAT

PRIMER

CUTTER

.020 + .005

86o to 90o

SUBSTRATE

TOPCOAT

PRIMER

CUTTER

.020 + .005

86o to 90o in

SAE INTERNATIONAL AMS3144™A Page 13 of 17

4.7.5.3 Flexibility

4.7.5.3.1 Impact Resistance

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel C specimens per Table 5. The test panels shall be tested in accordance with ASTM D2794.

4.7.5.3.2 Low Temperature Flexibility

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel C specimens per Table 5. The test panels shall be tested in accordance with ASTM D522, Test Method B at a temperature of -65 °F ± 5 °F (-51 °C ± 3 °C) using a 4-inch diameter mandrel.

4.7.5.3.3 Elongation

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel B specimens per Table 5 and tested using a Gardco GE Universal Impact Tester, Model #172 or equivalent as approved by the qualifying activity using a specialized impacter that weighs 3.6 pounds and has formed four convex spherical segments on each end, each of different radii and extension. Place the coated panel, film side downward, on the rubber pad at the bottom of the impacter guide. Drop the impacter on the panel through the impacter guide, ensuring that the impression of the entire rim of the impacter is made in the panel. Reverse the impacter ends and drop it through the guide on the panel adjacent to the first area of impact. Using power 10 magnification, observe the percent elongation corresponding to the largest spherical impression at which no cracking occurs.

4.7.5.4 Adhesion

4.7.5.4.1 Wet Tape Test

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5. The test panels shall be immersed in distilled water for 7 days at room temperature. Remove the test panels from the water, wipe dry with a soft cloth and conduct adhesion test in accordance with ASTM D3359 test method B using 3M 250 tape or tape meeting the requirements of AMS3721, within 10 minutes of removal from water.

4.7.5.4.2 Dry Tape Test

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5. Conduct adhesion test in accordance with ASTM D3359 test method B using 3M 250 tape or tape meeting the requirements of AMS3721.

4.7.5.5 Compatibility

4.7.5.5.1 Topcoats

The primer and topcoat shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5.

4.7.5.5.2 Repair Primer

The primer and repair primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5.

4.7.5.5.3 Sealants

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using six Panel C specimens per Table 5, except that the thickness of the panel shall be 0.040 inch. The sealant (3.5.7.3) shall be mixed and cured per manufacturer’s instructions.

The sealant shall be applied and tested in accordance with AS5127/1.

4.7.5.6 Fluid Resistance

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5. Panels shall be immersed in the fluids at the specified conditions, removed, and examined.

SAE INTERNATIONAL AMS3144™A Page 14 of 17

4.7.5.7 Humidity Resistance

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5 and tested in accordance with ASTM D2247.

4.7.5.8 Solvent Resistance (Cure)

The primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5 and tested in accordance with ASTM D5402.

4.7.5.9 Corrosion Resistance

4.7.5.9.1 Salt Spray

The primer coatings with and without topcoat shall be applied as in 4.7.3 and 4.7.4 using five Panel A specimens per Table 5. Panels shall be scribed per 4.7.4.1. The machined scribes should stop 1 inch from each corner. The coating shall be tested in accordance with ASTM B117.

4.7.5.9.2 Filiform

The primer coatings with and without topcoat shall be applied as in 4.7.3 and 4.7.4 over five Panel A specimens per Table 5.

Panels shall be scribed per 4.7.4.1. The machined scribes should stop 1 inch from each corner. The specimens shall be placed vertically in a desiccator containing 12 Normal hydrochloric acid (HCl) for 1 hour at 75 °F ± 5 °F (24 °C ± 3 °C).

Within 5 minutes after removal from the desiccator, the panels shall be placed in a humidity chamber at 104 °F ± 5 °F (40 °C ± 3 °C) and 80% ± 5 RH for 1000 hours.

Evaluate specimens using a 4 x 15 transparent grid of 1/8 inch squares as shown in Figure 2.

Figure 2 - Filiform corrosion evaluation grid

Place the centerline over each leg of the scribe and count the number of squares with filiform growth. Add the totals of the inner rows together from each scribe leg and record results. Do the same for the outer rows. The highest (best) rating that can be achieved would be 0 (inner), 0 (outer).

4.7.5.9.3 Sulfur Dioxide/Salt Spray

The primer coating shall be applied as in 4.7.3 and 4.7.4 over five Panel A specimens per Table 5. Panels shall be scribed per 4.7.4.1. The machined scribes should stop 1 inch from each corner. The specimens shall be tested per ASTM G85, Annex A4.

4.7.5.10 Infrared Reflectance (Type 2 only)

Type 2 primer shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5. The total reflectance (specular and diffuse) of the primer coatings relative to barium sulfate shall be measured using a near infrared spectrophotometer over a range of 700 to 2600 nm.

SAE INTERNATIONAL AMS3144™A Page 15 of 17

4.7.5.11 Rain Erosion

Prepare four air foils per Figure 3 using Panel D specimens per Table 5. Air foils shall be made using 0.063 inch substrate to fit whirling arm fixture. Mask off leading edge nose at the tangent point between the radius and flat surfaces using 1-inch vinyl tape. Apply primer and topcoat in accordance with 4.7.3 and 4.7.4. Immerse the test specimens in water at 75 °F ± 5 °F (24 °C ± 3 °C) for 24 hours prior to testing. Start the test within 1 hour after removal from water.

A water ring, mounted above the rotation blade, shall be used to simulate a natural rainfall of 0.5 in/h and 2.0 mm droplet size. The test shall be run at greater than 400 mph at the sample’s center for 30 minutes.

Figure 3 - Rain erosion test coupon

4.7.5.12 Strippability

The primer and topcoat shall be applied in accordance with 4.7.3 and 4.7.4 using Panel A specimens per Table 5. Coating remover conforming to the control formulation of TT-R-2918, Type I shall be brushed or poured over the entire test panel to completely cover the coating surface. After no less than 6 hours of exposure, the panel shall then be scraped with a rubber scraper to remove loosened coating. The test panels shall then be rinsed with cool tap water and brushed with a soft, nylon bristle brush. If the removal procedure has not achieved minimum stripping requirement, coating remover shall be reapplied for an additional 6 hours. Paint removal shall be determined for each test panel by estimating the percentage of the substrate revealed by the stripping process. The result shall be the average of the two panels tested.

4.8 Reports

4.8.1 The supplier of primer shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test requirements and stating that the primer conforms to the other technical requirements. This report shall include the purchase order number, batch number, AMS3144A classification, manufacturer’s designation, and quantity.

4.8.2 A safety data sheet, conforming to an acceptable format for the purchaser, shall be supplied to the purchaser prior to, or concurrent with, the first shipment of the product. ANSI Z400.1/Z129.1 is one possible safety data sheet format.

4.9 Resampling and Retesting

If any specimen used in the above tests fails to meet specified requirements, disposition of the primer may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to meet specified requirements shall be cause for rejection of the primer represented. Results of all tests shall be reported.

SAE INTERNATIONAL AMS3144™A Page 16 of 17

5. PREPARATION FOR DELIVERY

5.1 Packaging

5.1.1 Unit Package

The primer shall be delivered as the resin feed component and the pigment paste component.

5.1.2 Containers

The resin feed component and the pigment paste component shall be packaged separately and furnished in sizes for customer convenience using industry acceptable containers.

5.1.3 Exterior Shipping Containers

Exterior shipping containers shall conform to ASTM D1974.

5.1.4 Preparation for Shipment

5.1.4.1 Packaging shall be accomplished to ensure that the resin feed component and the pigment paste component will be protected against damage from exposure to weather and any other normal hazard during shipment or storage.

5.1.4.2 Packaging shall be accomplished in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the resin feed component and the pigment paste component to ensure carrier acceptance and safe delivery.

5.2 Identification

5.2.1 Resin Feed and Pigment Paste

Each container of the resin feed component and the pigment paste component shall be permanently and legibly marked with not less than the following:

PRIMER, ANODIC ELECTRODEPOSITION FOR AIRCRAFT APPLICATIONS

FOR CORROSION INHIBITION, CHEMICAL AND SOLVENT RESISTANCE

AMS3144A, TYPE (1 OR 2) CLASS (C OR N)

MANUFACTURER’S IDENTIFICATION

NAME OF MANUFACTURER

BATCH NUMBER OF RESIN FEED AND PIGMENT PASTE

DATE OF MANUFACTURE

DATE OF EXPIRATION OR SHELF LIFE

5.2.2 Shipping Containers

Each exterior shipping container shall be marked with not less than the following:

PRIMER, ANODIC ELECTRODEPOSITION FOR AIRCRAFT APPLICATIONS

FOR CORROSION INHIBITION, CHEMICAL AND SOLVENT RESISTANCE

AMS3144A, TYPE (1 OR 2) CLASS (C OR N)

MANUFACTURER’S IDENTIFICATION

NAME OF MANUFACTURER

BATCH NUMBER OF RESIN FEED AND PIGMENT PASTE

DATE OF MANUFACTURE

DATE OF EXPIRATION OR SHELF LIFE

NET WEIGHT

SAE INTERNATIONAL AMS3144™A Page 17 of 17

6. ACKNOWLEDGMENT

A manufacturer shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.

7. REJECTIONS

Primer not conforming to this specification, will be subject to rejection.

8. NOTES

NOTICE

This specification may reference the use of substances, products or procedures that are restricted or banned by local (regional) chemical substance regulations. Users of this specification should consider the implications of local legislation on the products, substances, and processes referred to within the document.

8.1 Revision Indicator

A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.

8.2 Dimensions and properties in inch/pound units and Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.

8.3 Purchase documents should specify not less than the following:

AMS3144A Type, Class Type and size of containers desired Quantity of containers desired Special packaging, if required

PREPARED BY AMS COMMITTEE “G-8”

4.4.3 Shelf Life Extension Tests

4.7.3.2 Cleaning of Test Panels

4.7.5.9.3 Sulfur Dioxide/Salt Spray

4.7.5.12 Strippability

4.9 Resampling and Retesting