1、_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 theref
2、rom, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2013 SAE InternationalAll rights reserved. No part of this publication may b
3、e 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
4、: 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMSC26074DAEROSPACEMATERIALSPECIFICATIONAMS-C-26074 REV. DIssued 1998-08Noncurrent 2005-10Cancelled 2011-
5、07Revised 2013-06Stabilized 2013-06Superseding AMS-C-26074CElectroless Nickel CoatingsRATIONALEAMS-C-26074D rescinds the previous cancellation and supersession, and at the same time stabilizes the document for legacy use requested by the electronic parts industry.STABILIZATION NOTICEAMS-C-26074D has
6、 been declared “STABILIZED“ by AMS Committee B and will no longer be subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of technical requirements. Newer technology may exist. The last technical update of this document occurred in Augu
7、st, 1998. Users of this document should refer any certification issues (e.g. exceptions listed on the certification report) to the cognizant engineering organization for their disposition. CAUTION: In many cases the purchaser is not the cognizant engineering organization (i.e. purchaser may be a sub
8、 tier supplier).AMS Committee B recommends that the following technically equivalent (e.g. properties, fit, form, function) specification be used for future procurement. This listing does not constitute authority to substitute AMS2404 for the “STABILIZED” specification. Authority for substitution sh
9、ould be granted by, or approved by, the cognizant engineering organization.AMS2404, Electroless Nickel PlatingCorrelation Information:ClassAMS-C-26074 AMS2404 RequirementClass 1 Class 1Class 2 Class 2Class 3 Class 3Class 4 Class 4ThicknessAMS-C-26074 AMS2404 RequirementGrade A 0.0010 inch (25 g80m)
10、minimumGrade B 0.0005 inch (13 g80m) minimumGrade C 0.0015 inch (38 g80m) minimumCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-C-26074D Page 2 of 9NOTE: A prior version of this document, AM
11、S-C-26074A, was cancelled in favor of the reinstated MIL-C-26074E. MIL-C-26074E was superseded by MIL-DTL-26074F. MIL-DTL-26074F is available only to NAVSEA Nuclear personnel and has been superseded by AMS-C-26074 for the prior users of MIL-C-26074. AMS-C-26074B was therefore reinstated and designat
12、ed as a noncurrent document. Subsequently, AMS2404 was updated for technical equivalency to allow supersedure of AMS-C-26074B by AMS2404. The cancellation and supersession of AMS-C-26074C was rescinded in favor of the stabilized status for this document, reflected by AMS-C-26074D. New designs should
13、 consider AMS2404, AMS2433, or other applicable specifications.NOTICEThe original issue of this document, AMS-C-26074, was taken directly from U.S. Military Specification MIL-C-26074E, and contained only minor editorial and format changes required to bring it into conformance with the publishing req
14、uirements of SAE technical standards. The initial release of this document was intended to replace MIL-C-26074E. Any part numbers established by the original specification remain unchanged.The original Military Specification was adopted as an SAE standard under the provisions of the SAE Technical St
15、andards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated adoption of government specifications and standards. TSB rules provide for (a) the publication of portions of unrevised government specifications and standards without consensus voting at the SAE Committee level, and (b) t
16、he use of the existing government specification or standard format.Under Department of Defense policies and procedures, any qualifications requirements and associated qualified products lists are mandatory to DOD contracts. Any requirement relating to qualified products lists (QPLs) has not been ado
17、pted by SAE and is not part of this specification.1. SCOPE1.1 ScopeThis specification covers the requirements for electroless (autocatalytic chemical reduction) deposition of nickel-phosphorous alloy coatings on metal and composite surfaces.1.2 Classification1.2.1 ClassesThe nickel coatings shall be
18、 classified in accordance with the thermal treatment applied subsequent to plating.Class 1 - As plated, no subsequent heat treatment: A bake for hydrogen embrittlement relief is not considered a heat treatment.Class 2 - Heat treated to obtain required hardness: May be used on all metals not affected
19、 by heating to 500 F and above.Class 3 - Aluminum alloys non-heat treatable, and beryllium alloys processed to improve adhesion of the nickel deposit.Class 4 - Aluminum alloys, heat-treatable, processed to improve adhesion of the nickel deposit.1.2.2 GradesThe nickel coatings shall be of the followi
20、ng grades:Grade A - 0.0010-inch minimum thickness.Grade B - 0.0005-inch minimum thickness.Grade C - 0.0015-inch minimum thickness.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-C-26074D Page
21、 3 of 92. APPLICABLE DOCUMENTSThe 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 refer
22、enced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.2.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (
23、outside USA), www.sae.org.AMS2430 Shot Peening, Automatic2.2 U.S. Government PublicationsAvailable from DLA Document Services, Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: (215) 697-6396,http:/quicksearch.dla.mil/.MIL-STD-1916 DoD Preferred Methods for Acceptance of Product2.3
24、 ANSI PublicationsAvailable from American National Standards Institute, 25 West 43rdStreet, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org.ANSI/ASQ Z1.4 Sampling Procedures and Tables for Inspection by Attributes2.4 ASTM PublicationsAvailable from ASTM International, 100 Barr Harbor Drive,
25、 P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM B 117 Method of Salt Spray (Fog) TestingASTM B 487 Measurement of Metal and Oxide Coatings Thickness by Microscopical Examination of a Cross Section, Method for (DOD adopted)ASTM B 499 Standard Test Method for Mea
26、surement of Coating Thickness by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals (DOD adopted)ASTM B 567 Method for Measurement of Coating Thickness by the Beta Backscatter MethodASTM B 568 X-Ray Spectrometry (DOD adopted)ASTM B 571 Test Methods for Adhesion of Metallic CoatingsAS
27、TM B 578 Test Method for Microhardness of Electroplated CoatingsASTM E 18 Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials, Tests for (DOD adopted)ASTM E 384 Microhardness of Materials, Test Method forASTM F 519 Mechanical Hydrogen Embrittlement Testing of Plating Processes
28、and Aircraft Maintenance Chemicals (DOD adopted)Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-C-26074D Page 4 of 93. REQUIREMENTS3.1 Materials3.1.1 Metals and composites: Iron, copper, alum
29、inum, nickel, cobalt, beryllium, titanium, and their alloys can be plated directly. Composites can be plated directly by using special pretreatments to prevent the basis material from contaminating the bath or to obtain adequate coating adhesion.3.1.2 Tensile strengthAll steel parts having an ultima
30、te tensile strength of 220 000 psi, or above, shall not be coated without approval of the procuring activity.3.2 Precoating procedures3.2.1 General requirements3.2.1.1 Unless otherwise specified, the coating shall be applied after all basis metal heat treatments and mechanical operations such as mac
31、hining, brazing, welding, forming, and perforating of the part have been completed.3.2.1.2 Parts, prior to plating, shall be degreased, abrasive and/or alkaline cleaned, and acid pickled as required to obtain maximum coating adhesion.3.2.1.3 Hardness measurementPrior to coating, steel parts shall be
32、 measured for hardness in accordance with ASTM E 18.3.2.2 Stress relief heat treatmentPrior to cleaning and coating, all steel parts having a hardness of Rockwell C40 or above, which have been machined, ground or surface hardened (includes cold worked but not shot peened surfaces), shall be given a
33、stress-relief heat treatment at a temperature that will produce maximum stress relief without reducing the hardness to less than the specified minimum.3.2.3 Shot peeningPrior to coating, all steel parts having a hardness of Rockwell C40 or above used in fatigue applications and/or subject to stress
34、corrosion shall be shot peened in accordance with AMS2430. Unless otherwise specified, the shot peening shall be accomplished on all surfaces for which the coating is required and all immediately adjacent surfaces when they contain notches, fillets or other abrupt changes of section size where stres
35、ses will be concentrated.3.3 Coating properties3.3.1 General requirements3.3.1.1 Manufacturers are given latitude in the selection of specific plating bath formulations used for the chemical deposition of an amorphous nickel-phosphorous metallic compound provided the coating obtained meets the requi
36、rements of this specification.3.3.1.2 Equipment, solutions, and process procedures shall be subject to the approval of the procuring activity.3.3.2 ThicknessUnless otherwise specified, minimum thickness of the nickel coating shall be 0.0010 inch (0.026 mm) (Grade A) for aluminum based alloys, 0.0005
37、 inch (0.013 mm) (grade B) for copper, nickel, cobalt, titanium and beryllium alloys, and 0.0015 inch (0.039 mm) (grade C) for iron-based alloys.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AM
38、S-C-26074D Page 5 of 93.3.3 Adhesion on metalsThe coating adhesion after completion of all processing and thermal treatments shall be such that when examined at a magnification of 4X, the coating shall not show separation from the basis metal when tested in accordance with ASTM B 571 as specified in
39、 4.5.2. It also shall be impossible to detach any area of the coating with a sharp instrument on the outside radius of the bent-test specimen. Formation of cracks that do not result in loss of plating adhesion is acceptable.3.3.4 Corrosion resistanceGrade A coatings on aluminum alloys and grade C co
40、atings on iron alloys after plating and all required thermal treatments shall show no visual evidence of corrosion of the basis metal when tested in accordance with 4.5.5.3.4 Postcoating procedures3.4.1 Hydrogen embrittlement relief bakeWithin 4 hours after coating, coated class 1 and class 2 steel
41、parts that have a hardness of Rockwell C40 or above shall require a hydrogen embrittlement relief bake at 375 F 25 for not less than 3 hours. Parts, including carburized parts, that will decrease in hardness by heating to 375 F 25 shall be heated to 275 F 15 for not less than 5 hours. When tested in
42、 accordance with 4.5.4, the baked parts shall not crack or fracture.3.4.2 Heat treatments3.4.2.1 Class 2 hardness coatingsClass 2 coatings shall have a minimum hardness of 800 knoop or equivalent vickers when tested in accordance with 4.5.3. Class 2 coatings on steel parts that have a hardness of Ro
43、ckwell C40 or above are required to be tested in accordance with 4.5.4 without cracking or fracture. The hardness can be achieved by heating the part (See 4.5.4 and 6.3) within 4 hours after coating.3.4.2.2 Class 3 coatingsCoated nonheat-treatable aluminum parts shall be heated for 1 to 1.5 hours at
44、 375 F 15 to improve adhesion of nickel deposit.3.4.2.3 Class 4 coatingsCoated heat-treatable aluminum alloys shall be heated between 240to 260 F for 1 to 1.5 hours to improve adhesion of nickel deposit.NOTEThese alloy types and grades may undergo microstructural changes when heated to 375 F.)3.5 Id
45、entification markingWhen specified, the coated parts shall be marked with a fluid not affected by water, or rub off, or smear during shipment or storage; and shall carry a tag giving the following information:a. Basis materialb. Number of this specification.c. Class and grade of coating.Copyright SA
46、E International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS-C-26074D Page 6 of 93.6 Workmanship3.6.1 Basis materialThe basis material shall be free from defects that will be detrimental to the utility, appearance, o
47、r serviceability of the finished product or part and coating.3.6.2 Nickel coatingThe nickel coating shall be smooth, adherent, and free from visible blisters, pits, nodules, porosity, cracks and other defects. All details of workmanship shall conform to the best practices for high quality coating.4.
48、 QUALITY ASSURANCE PROVISIONS4.1 Responsibility for inspectionUnless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in this specification
