Attachment_3_MIL-DTL-26074D_Revision_D.pdf

MIL-C-26074C

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MILITARY SPECIFICATION

This specification ie approved for we by all Departfmnta and Agencie8 of the Oapartmmt of Defense.

1. SCQPS

1.1 -. This specification covers the raquira!mnta for elactreless (autecat.dytic chemical mxhxtion) deposition of nickel or nickel coatings on smtal eurfaces.

1.2 Claasif icatio~

1.2.1 Classes The nickel seatings shall be classified in accordance with the the=hatuent appl id subsequent to plating.

Claas 1 - Ae plated, no subsequent heat treatrmnt. A We for hydrogen eubrittlenmnt relief is not considered a heat treatnmnt.

class 2 - Neat treated ta obtain required hardness. May be used on al1 nstals not affected by heating ta S00% and above.

Cleas 3 - Aluminum alloys nonheat-treatable, and beryllium alloys processed to irqmwve adhesion of the nickel deposit.

Claas 4 - Aluminm alloys, heat-treatable, processed to isprove adhesion of the nickel deposit.

Sanef icial commnte (recormsindatione, additions, deletions) and any pertinent data +ich say be of use in inproving this docum nt aheuld be addressed t.e: ASD/=, Wight-Patterson AFS OH 45433-6503, by wing the self -addressed Standard ization Osctmmnt Iuproveremt proposal (DD Form 1426) appearing at the end of this documnt or by letter.

Arlsc N/A ARSAWFT gIS1’RISUl’IONS1’ATEhEtW A : Approved for public rele=e, distribution is lmlimited.

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MIL-C-26074D

1.2.2 Grades. The nickel coatings shall be of the following grades:

(lrade A - O.0010-inch minimum thickness

Grade B - 0.0005-inch minimum thickness

Grade C - 0.0015-inch minimum thickness

2. APPLICABLE DOCUklENTS

2.1 Government documents

2.1.1 Specifications and standards. The fol lowing specifications and standards form a part of this documant to the extent specified herein.

Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (ace 6.2)

SPECIFICATIONS

MILITABY

MIL-I-13165 Shot Peening of Metal Parts

STANDABDS

MILITARY

MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes

MIL-STD- 1949 Inspection, Magnetic Particle

(Unless otherwise indicated, copies of the military specifications and standards are avai lable from the Naval Publications and Forma Center, (ATTN: NPODS) , 5801 Tabor Avanue, Philadelphia, PA 19120-5099.

2.2 pJon-Government Dubl ications. The fol lowing documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS specified in the solicitation. Unless otherwise specif iad, the issues of documents not 1isted in the DODISS are the issues of the documents cited in the solicitation (see 6.2) .

AMSRICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM B487 Measurement of Metal and Oxide Coatings Thickness by kfiCrOSCODiCal Examination of a Cross Section, Method for (DoD adopted)

ASTM B499 Standard Test Method for Measurement of Coating Thickness by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals (DoD adopted) hfIL-C-26074D

ASl%fB568

SIBf E18

Asru E384-84 Asm FS19

X-REV SpSctreuetry (DoD 13dOptSd) Reckwll Nerdness and RocIns311 Superficial Nsrdness of hbtallic Materials, Test8 for (DsD adopted) Microhardness of Materials, Test t&thod for Nhchanical I&iragen Fnbrittlement Testing of Plating processes and Aircraft !bintaance Chemi&ale (DoD adopted)

(Application for cepies should be addressed to the Ameriaan Socioty for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1137.)

2.3 Order of Dracad ence. In the event of a conf 1ict betmmen the text of this decumnt end the references cited herein. the text of tbie dosumnt takes precedence. Nothing in this d—nt, h-ver, etpersedes appl iaable la= end regulations unlees a specific exemption hsa been obtained.

3. REQUIRRQ71’S

3.1 *terials

3.1.1 &lsis Setal. The coating fmy h used on iron, ceppar, alisninum, nickel, cobalt, beryllium end titanitns Wad alloys.

3.1.2 ‘J’ensile stranxth. Al 1 steel parts having en ultimate tensile strength of

220.000 pei, or abeve, shal 1 not be ceated vdthout approval of the procuring activity.

3.2 p-acoatina srocedwes

3.2.1 Qenera 1 raau irements.

3.2.1.1 Unless otherwise specified, parts shall be cleaned, pickled, or otherwise preheated se necessary.

3.2.1.1.1 bless approved by the procuring activity, high strength steels abcwe Rockwell C40 hardness shal 1 not be subjected ta acid pickling.

3.2.1.2 Unless otherwise specified, the coating shel 1 be applied after al 1 basis metal haat treatmnts and umhanical operations * as machining, brazing, wlding, forming and perforating of the part hava been cenpletad.

3.2.1.3 Xardnese Imasure nmnt. Frior to coating, eteel perta ahal 1 be

-~- for ~eSS in accordance with ASPfd E- 18.

3.2.2 ~trase relief heat treatfmmt. Prior ta cleaning and coating, al 1 steal parta having a hardness greater than Rockwml 1 C40 shal 1 be given a etress-relief heat traatmant at a terqmrature that sd 11 produce mxsisun stress rel lef withc.ut reducing the hardness ta less than the specified minim.m

3.2.3 Shot seenin~. Prior to coating, all steel ~te having a hardness of

Reckl 1 C40, or above, and are designed for unlimited life tier dynamic loada, shal 1 be shot peanad in acordance with MIL-S-13165. Unless otherwiea

3Source: https://assist.dla.mil -- Downloaded: 2016-12-15T12:44Z specified, the shot peening shal 1 be acconpl ished on al 1 surfaces for which the mating is required and al 1 i-iately adjacent surfaces when they contain notches, fi1lets, or other abrupt changes of section size tiere stresses wi11 be concentrated.

3.3 Coating nrooarties

3.3.1 General rao-uirermnt.a

3.3.1.1 Manufacturers are given latitde in the selection of raw ~terials for forrmlating the coating bath provided the finish mets the requireumnts of this specification.

3.3.1.2 F@fpmnt, solutions end process procedures shal 1 be subject t.cthe approval of the procuring activity.

3.3.2 Thickness. Unless otherwise specified, minins.nnthickness of the nickel coating shal 1 be 0.0010 (Grade A) for altnninum based al 10YS; 0.005 (Qrade B) for copper, nicke 1, cobalt, titanium and berylliun alloys; and

0.0015 (Grade C) for iron based alloys.

3.3.3 Adhesion. The edhes ion shal 1 be such that *en examined at a magnification of approximately four dienaters, the nickel coating shal 1 not show separation from the baeis mtal at the interface *en tested a.especified in 4.5.2. The interface betuaen the nickel end the basis I&Al is the surface of the basis uetal before coating. Occtmrence of any defect in the coating ahich could lead to failure of the coating shal 1 be considered as nonconformance to this specification. Coating should not be acconpl ished on parts tiich contain defects that muld lead to failure of the pert, or coating, in service.

3.4 Postcoatiru! procedures

3.4.1 Hydrogen etiritt lermnt relief bake. W thin 4 hours after coating, coated class 1 end claas 2 steel parts v.hichhave a hardness of Rockml 1 C40 or above sha 11 require a hydrogen embritt1enmnt re 1ief bake at 375°F ~ 25°F for not less then 3 hours. V&en tested in accordance with section 4, the baked parts shal 1 not crack or fracture.

3.4.2 Haat treatmnts

3.4.2.1 Class 2iWdn 8ss coatinfis. Clam 2 coatings shal 1 have a ndninum hardness of 700 Vickers or equivalent. The mess can be achieved by heating the ~t per the schedule given in 6.3.

3.4.2.2 CIWS 3 coat itis. Coated nonheat-treatable aluminum parts shal 1 be heated for 1 to 1 1/2 hours at 375’% L 15% (191°C ~ E°C) tO i~rOve *esiOn of nickel deposit.

3.4.2.3 Claas 4 coatinus. Coated heat-treatable aluminum al 10YS shal 1 km heatad betvaen 240°F to 260°F (116°C to 12@C) for 1 to 1 1/2 hours to inprove adhesion of nickel deposit. (NOTE: These al 10Y types end grades may undergo ticrostructural changes &en heated to 375%.)

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MIL-C-2607UI

3.5 Identification nark i~. Vhen specified, the coated parte shal 1 b marked with a fluid not affected by water and which dial 1 not rub off or mar during shipxmnt .or storage, end shal 1 carry a tag giving the following information:

a. Sasis mtul

b. Nmtier of this Specification

c. Clas and grade of coating

3.6 ‘+brlmunehip

3.6.1 Bssie mta~. The basis mtal ehall be free frem defects that will be detrismntel to the utility, appearance or serviceability of the finished pr.xhsst or part and coating.

‘3.6.2 ~ickel coatin& The nickel coating shal 1 be sfwoth, adherent, and free from vieible blisters, pita, nodules, porosity, cracks and other defects. Al 1 detaile of workmanship ehal 1 conform to the best practices for high quality coating.

4. QUALITY KLSWVWS PXWISIONS

4.1 %- nsibilitv for in Srlect iOr& Unless otherwise specified in the contract or purchase order, the contractor ie reaponeibl e for the performance of al 1 inspection requirenmts (examinations end tests) as specified herein. Wcept ae otherwise specified in the contract or purchaae order, the contractor w use his om or w other faci 1ities suitable for the perfo-ce of the inspection requirements specified herein, unless disapproved by the Gcvernuent. The Cfovernnrmt reserves the right to perform any of the inepectione set forth in the npeci fication vhere such inspections are deesmd necessary to ensure euppl ies end aerv ices conform to prescribed requirenmnts.

4.1.1 Resuena ibilitv for coml ie.nce. All iterm shall met all raquireunnts of sections 3 and 5. The inspection set forth in this

.ep=ifi=tion ehd 1 becOM3 a part of the contractor’s overal 1 inspection system or quality program The absence of any inspection requ.irennnte in the epecif ication ehal 1 not relieve the contractor of the reepeneibil ity of ensuring that al 1 produte or auppl ies eubmitted h the @vernumt for acceptance ccmply with al 1 requirermnte of the contract. Sanpling inspection, as pert of mrwfactwing operations. is an acceptable practice ta ascertain confo-ce h requiresant.s, houmver, thie does not autberize submission of Imovm defective material, either indicated or actuml, nor does it conmiit the Gsve-nt b accept defactive enterial.

4.2 Classification of ineueCtiona. The inspection requirenmnte specified herein are classified es quality conformance inspection (8ee 4.4) .

4.3 Inem ction conditions. Unless otherwise pified, al 1 inspections shal 1 be perfomsxf in accordance with the mthods of inspection specified in 4.5.

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4.3.1 In.elJection lot. A lot shal 1 consist of coated parts of the aanm type and class, sam basis nmtal, and of approxirmtel y the S- size end shape, coated under the ssua conditions and by maria of the sam coating process, and submitted for acceptance at one tium.

4.3.2 Semr ate sueCimm. When the coated pWtB - of such form as tO be.

not readily adaptable to a test specified herein, or at the discretion of the inepacter for destrwtive tests for the sanpl ing of emal 1 lot sizes, the test may be tie by the uae of separate specinkma coated concurrent 1y with the parts represented. The separate ~iimne Ehal 1 k of a -is Imtal equivalent to that of the parts represented. “Equivalent” basis mtal incluies chemical conpowition and finish of surface prior to coating. For eale. a cold-rol lad steel surface shal 1 not be used ta represent a hot-rol led steel surface; owing to the iupracticabi 1ity of forging or aaating separate test spscirmnc, hot-rol led steel specimna mey be ueed to represent forged and cast steel parte. The separate specimene shal 1 be stripe aPproxirmtely l-inch wide, 4 inches long, and 0.04-inch thick except those r-red fOr detertimtion of enbritt lemant relief (see 4.5.4).

These specimna shal 1 be intrcdwsd into a lot at regular intervals prior to the cleaning operation prel iminery to coating and shal 1 not be separated therefrom umti 1 after completion of the processing.

4.4 Qual itv conformance inspection. Oual ity conformance inspsctiona ahal 1 consist of ssnpling plans A, B, C and D.

4.4.1 Sanuling Dlen A - Saimling re’ocsdures for visual exandnat ion and nondestructive tests of coating thickness. Sanples shall be selected from each lot (see 4.3.1) and acceptance of the lot ahal 1 be determined in accordance with inspection level II and acceptable quality level (#@L) 1.5 of MIL-Sl’D-105. Periedic thickness and adhesion tests nay ta perforrmd te verify conpsrabl e nondestructive tests so aa to assure proper pr6cess contro 1.

4.4.I.1 Visuel insvsction. Ssch of the sanple parts selected in accordance with 4.4.1 shal 1 bs examined visuel lY for conformance to requirermnts of 3.6.2.

4.4.1.2 Thickness (nondestrwztive tests). Each of the se.nple ~ts selected in accordance with 4.4.1 shal 1 be inapectsd and the coating thickness rmasured in several locations on each part in accordance with 4.5.1.2. The part ahal 1 be cons idersd nonconforming if one or nmre nmacuremnt fai 1 to raet the specifisd mininum thickness.

4.4.2 E&wlinfi Dlan B - ~liti Drocsdures for evaluetin.e hvdrofien enkn.ittlemnt relief destructive tests - Classes 1 and 2. A hydrogen embrittlemnt relief test sh+l 1 be rm once per nmnth, es specified in 4.5.4.

4.4.3 .%nmling Dlarlc-sanQ linffDrecsdure for adhesion tests and destrwtive tests of coatinfi thickness. A random sanple of four parts shel 1 be selected from each inspection lot (see 4.3.1) or four separat.ely coated apecimans shsl 1 be prepared in accordance with 4.3.2 to represent each inspection lot. If the numbsr of parts in an inapaction lot is four or less, the nunber of parts in the sample shal 1 be determtnad by the procuring activity OF shal 1 be left to the discretion of the inspector.

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4.4.3.1 ‘J’hickne#s(destrwtive) teat. 2ach part shall be tistd in accordance with 4.5.1.1 in several locations. If the coating thickness at any place en any pert is less than the apacifiad thickness, the lot shall be rejected.

4.4.3.2 Pdh esiom. The parts used for the thickness tast (4.4.3.1)may be uead as epecinxme for the adhesion taste specified in 4.5.2 provided they ara of Suitable .eizeand form Failure of one or mra of the tat spacirmne shall constitute fai lu.a of the lot.

4.4.4 ~lind DltVlD - %nml inn orecedura for hardnees teet. All CISSS 2 coated parta selected from 4.3.1 ehal 1 be Subjected to a hardrmsa test in accordance with 4.5.3.

4.5 ~thoda of inepactiOQ

4.5.1 ~ickneaa teat

4.5.1.1 plicroscepic !mthed. The coating thickness shal 1 be determined in

=ccIti= with W17d B487 .

4.5.1.2 .Inatrunmnt mthod. The inatrwmnt used, its calibration, and its operation for testing given parts shal 1 be suh that the coating thickness shall be determined with I1O percent of ita t- thickness: or the inetrumnt shal 1 be of a type approved by the procuring activity (see 6.4).

The coating thickness ehal 1 be determined in accordance with ASTM B499.

4.5.2 Mhesion tist. The test spacitmn ehal 1 be bent 180 degreae over a mandrel diamter 4 tirms the thickness (1 cm minisx.anlof the apecinnn and examlnad at 4X pewar magnification for flaking or separation of the interface. It shal 1 then ti ispessible to detach any appreciable mae of the coating with a sharp inetrtare.nton the outside radius ‘of the bent test specinm. When the coated parts are not raadi ly adaptable to the bent test, adhesion may be determined on the coated part by cutting the coating from the -is met.sl at the interface in continuous path and examined aa above.

4.5.3 )f=mdnesa tests. Vickers hardness ue.aememnts shal 1 be in accordance with ASTM E384 for class 2 coating.e.

4.5.4 ~ittlenmnt relief. Cespliance wfth 3.4.1 shal 1 be determined with aanples of plated parts. Parte such ae spring pina, leek rings, etc.

vMch are installed in holes or rede, shall be similarly assembled wing the applicable parts apacif ications or drawing tolerances vhich ispose the .

rmxisus auatainad tensile load on the plated part. The #elected aasples shal 1 be subjected to a sustained tensile load equal to 115 percent of the maxim.un design yield load for uhich the part - designed. Testing ahal 1 cenform to AS1’MFS19. Parts edIichrequire special fisturas, ●xtranm loads b conply with the abeve raqulremmts, or vdierathe nuximm design yield load is net lmovm, may be represented by eeparate apecisnna. The notched roles s~l 1 ~ aWected to a sustained tensile load equal to 75 percent of the U1 timte notch tenai le strength of the satarial. The articles, 7Source: https://assist.dla.mil -- Downloaded: 2016-12-15T12:44Z parts or specimens shal 1 be held under load for at least 200 hours and then examined for cracks or fracture. Inspection of parts for cracks in the basis metal and the coating shal 1 be in accordance with MIL-STD-1949 using the fluorescent magnetic particle method. The lot shal 1 be rejected if any coated part develops cracks.

5. PACKAGING

5.1 Coated surfaces shal 1 be protected from damage during shipment and storage.

6. MOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory. )

6.1 Intended uses. The coating is intended for uce when hard and smooth surfaces are required on coated parts. Excel lent uniform deposits are produced on irregular parts. Coated parts, such as used in air compresaorso missi le fuel injector plates, pumps. reciprocating surfaces.

etc., are protected from oxidation, corrosion and waar. With aluminum electronic devices, not only is product contamination prevented, but the coated parts faci1itate soldering. Coated parts of stainless steel similarly facilitate brazing.

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number and date of the specification.

b. Class and grade, and heat treatment or condition (see 1.2 and 3.5).

c. Issue of DODISS to be the specific issue of 2.2).

d. Method of determining

6.3 Coating hardness

cited in the solicitation, and if required, individual documents reference (see 2.1.1 and compliance with 4.3.

6.3.1 Required hardness on class 2 coating on steel al 10YS may be achieved by heating per the following baking schedule:

‘F, Temperature W

500 4 or more 550 2 or more 650 1 or more 750 0.5 or more

6.3.2 Coating hardness on nickel , copper, cobal t and titanium based al 10YS can be achieved hy heating at 650°F i 10°F (343°C i 6°C) fOr 1 to 1-1/2 hours.

s

MfL-C-260740

6.4 W@ estrut ive thickness mwwrenwn ts. Thickness rmaclnwnmnts of electroless nickel coatings containing nrxw than 8 percent phocphoroue are sufficiently nonmagnetic to be fmesured for thickness in accordance with Whf 6499, Methed of Measurermnt of Coating Thickness by the Magnetic hlethed: Norms.gnetic Coatings on Wgnetic %eia Metals, if deposited on a ~etic baeis metal. When emesuring heat-treated coatinge containing axme than 8 percent phosphorous, the inetrumnt should be oal ibrated againet heat-treated atan&mdc of boem coatinge thickn*ss er equivalent calibration foils. Heat treatrmnt increases coating nagnotiunb b43asurenx3ntof electroless nickel coatings containing less than 8 percent phoaphoroue by a nagnetic IU3thed ia not reoonmmnded.

I

6.5 Subject term (kev vnrd) 11stin~.

nickel electmless (aut4xatalytic chemioal redution)

6.6 &+cvcled material. It is encouraged that recycled nnterial be wed ahen practical ea long ea it mete the requiram?mte of the docum nt 4aee 3.1) .

6.7 Changes fmm me vioue issl.leq.Aateriske (or vertical 1ines) are not uced in this revision to identify issue du to the extensiveness of custodians :

Air Force - 11

W-MR

Navy-s

&W&tie: recpect ta the previous

%elnlri~ activity:

Air Force - 11

Pm ject No. WFP-0407

Reviewers:

Air Force - 63, 84, 99 Navy-sN At-q+-MI, AR

Utters:

NaVy-os hqf-bE

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DEPARTMENT OF lHE AIRFORCE ASDjENES Wright-Patterson APB OH 45433-6503 111111nRo POSTAGE

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IF MAILED

IN THE

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POSTAGEWILLBEPAIDBYTHE OEPARIWCNTOF THEAIRFORCE

ASDtENES Wright-Patterson APS OH 45433-6503