ATTACHMENT 4 Table 1 (Nickel) Chromium Piston Rod Coating Requirements.pdf

Table 1: (Nickel) Chromium Piston Rod Coating Requirements

No. Test Criterion Remarks

1. Manufacturing Procedure Specification (MPS) for the application of technical coatings

Manufacturer to be ISO 9001 certified and or have produced coatings of the type and application specified for a minimum of 5 years with a written quality documentation procedure in place during that period.

Implementation and certification performed by the manufacturer. The MPS to address such items as personnel qualification for coating application, calibration of equipment and service maintenance records, material certificates with chemical composition, process parameter specification thresholds, dimensional control, inspection/ acceptance.

2. Coating Thickness As indicated or specified. Conduct pre-and post-process diameter measurements.

Additional tests may be performed of test samples produced at time of fabrication may be submitted.

3. Hardness 900 - 1100 HV 0.1 Vickers in accordance with ISO 4516 and

ISO 6507.

Alternative testing and results in accordance with manufacturer's standard testing procedures may be submitted to the Government for approval.

Hardness testing on final product prohibited

4. Adhesion strength Per requirements of ASTM B254 or ASTM B650 as applicable or manufacturers equivalent test as approved.

Test in accordance with manufacturers approved procedure if different than specified.

5. Corrosion testing-Cr30 ISO 9227 or ASTM G85:

Minimum 96h, Base material corrosion observed is prohibited.

Neutral Salt Spray Test

No. Test Criterion Remarks

6. Corrosion testing1-Ni/Cr 60/40

Test in accordance with manufacturer's standard test procedure as approved.

Salt Droplet Corrosion

7. Surface finish Rmr - mr (-1.5, 2.0) => 80% Ra: (>0.1 micrometers or 3.93 micro inches <0.4 micrometers or 15.75 microinches)

All surface finish parameters in accordance with ISO 4287 and

ISO 4288

Cracks, blisters, holes, or discoloration visible with naked eye are prohibited.

Defects >0.2 micrometers or

7.87 microinches are prohibited.

Defects through coating and into base material are prohibited.

Surface finish measurements to be obtained by contact stylus in accordance with ISO 3274.

General visual inspection.

Indications to be assessed visually at 30-40x magnification.

8. Impact test Perform impact testing in accordance with ASTM D2794, or a similar test in accordance with Manufacturer's standard testing procedures as approved.

Radial cracking at or below 14 Joules is prohibited.

9. Dynamic bending (3-pt) Perform Dynamic Bending (3- Pt) in accordance with Manufacturer's standard testing procedures. Submit test results.