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 there
2、from, 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 2011 SAE International All rights reserved. No part of this publication m
3、ay 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 U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMSC81562 AEROSPACE MATERIAL SPECIFICATION AMS-C-81562 Issued 1998-08 Reaffirmed 2011-10 Coat
5、ings, Cadmium, Tin-Cadmium and Zinc (Mechanically Deposited) NOTICEThis document has been taken directly from U.S. Military Specification MIL-C-81562B and contains only minor editorial and format changes required to bring it into conformance with the publishing requirements of SAE technical standard
6、s. The initial release of this document is intended to replace MIL-C-81562B. 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 Standards Board (TSB) Rules and Regula
7、tions (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) the use of the existing government sp
8、ecification 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 adopted by SAE and is not part of this
9、technical report.SAE AMS-C-81562 Page 2 of 16 1. SCOPE:1.1 Scope: This specification covers the requirements for three types and three classes of mechanically deposited cadmium, tin-cadmium or zinc coatings on metallic surfaces by impacting (peen plating).1.2 Classification: The coatings, cadmium, t
10、in-cadmium and zinc shall be of the following types and classes, as specified (see 6.2.1).1.2 Types: Type I - As coatedType II - With supplementary chromate treatment (see 3.2.9 and 6.1.2)Type III - With supplementary phosphate treatment (see 3.2.10)1.2.1 Materials and classes: 2. APPLICABLE DOCUMEN
11、TS: The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall be the issue in effect on the date of the purchase order.2.1 ASTM Publications: Available from 100 Barr
12、Harbor Drive, West Conshohocken, PA 19428-2959.ASTM B 117 Salt Spray (Fog) Testing.ASTM B 244 Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metal with Eddy-Current Instruments, Measurement of.ASTM B 487 Metal and Oxide Coating Thicknesses by Micros
13、copic Examination of a Cross Section, Measurement of.ASTM B 499 Coating Thickness by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metal, Measurement of.ASTM B 567 Coating Thickness by the Beta-Backscatter Method, Measurement of.ASTM B 568 Coating Thickness by X-Ray Spectrometry, Measu
14、rement of.Material ofcoatingClasses (thickness - inch)123456C - cadmium 0.0005 0.0003 0.0002 - - -T - tin-cadmium 0.0005 0.0003 0.0002 - - -Z - zinc 0.003 0.002 0.0017 0.001 0.0005 0.0003SAE AMS-C-81562 Page 3 of 16 2.2 U.S. Government Publications: Available from DODSSP, Subscription Services Desk,
15、 Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.TT-C-490 Cleaning Method and Pretreatment of Ferrous Surfaces for Organic Coatings.ZZ-E-661 Eraser, Rubber and Rubber Substitute.NNN-P-40 Paper, Lens.MIL-S-5000 Steel, Chrome-Nickel-Molybdenum (E4340), Bars and Reforging Stock.MIL-S-5002
16、Surface Treatments and Inorganic Coatings for Metal Surfaces of Weapons Systems.MIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base.FED-STD-141 Paint, Varnish, Lacquer and Related Materials, Methods of Inspection, Sampling and Testing.FED-STD-151 Metals; Test Methods.MIL-STD-105 Samp
17、ling, Procedures and Tables for Inspection by Attributes.MIL-STD-1312 Fasteners, Test Methods.3. REQUIREMENTS: 3.1 Materials: The materials used shall be such as to produce coatings of cadmium, tin-cadmium or zinc, as specified (see 6.2.1), which meet the requirements of this specification.3.1.1 Tin
18、-cadmium composition: The composition of the material for the tin-cadmium coating shall contain 25 to 55 percent tin by weight and the remainder shall be cadmium (see 6.10).3.2 General requirements: 3.2.1 Stress relief treatment: All steel parts having an ultimate tensile strength of 180,000 pounds
19、per square inch (psi) and above, which are machined, ground, cold formed or cold straightened, shall be given a heat treatment at a minimum of 191 14C (375 25F) for three hours or more, prior to cleaning and coating for the relief of damaging residual tensile stresses. Carburized parts shall be bake
20、d at 135 14C (275 25F) for five to eight hours.3.2.2 Cleaning: All ferrous parts shall be cleaned in accordance with MIL-S-5002. Those parts having a Rockwell hardness of C 33 and higher shall be cleaned using materials which have no damaging effects on the metal, such as pitting, intergranual attac
21、k, significant etching and hydrogen embrittlement. Oxides on steel used for parts shall be removed by mechanical means such as glass bead blasting or vapor blasting, or by electrolytical alkali cleaning. Acid pickling or cathodic cleaning shall not be used. Other basis metals shall be cleaned by met
22、hods which shall not damage the substrate and shall not interfere with adhesion of the coating.SAE AMS-C-81562 Page 4 of 16 3.2.3 Coating application: The coating shall be applied after all basis metal heat treatments and mechanical operation, such as machining, brazing, welding, forming and perfora
23、ting of the article, have been completed.3.2.4 Undercoating: The coating may be deposited directly on the basis metal without a preliminary coating except that a flash undercoat of copper or other suitable metal may be applied mechanically or by immersion to improve adhesion.3.2.5 Coverage: Unless o
24、therwise specified, the coating shall cover all surfaces as stated in 3.3.1, 3.3.1.1 and 3.3.1.2 including roots of threads, thread peaks, corners and recesses (see 6.2.1).3.2.6 Finish: Unless otherwise specified, either a light matte or semi-satin finish will be acceptable (see 6.2.1).3.2.7 Embritt
25、lement relief: Before application of any load or being used, all steel parts shall be held for a minimum of forty-eight (48) hours at room temperature after coating. Such conditioned parts, when tested in accordance with 4.5.6, shall not crack or fail by fracture.3.2.8 Supplementary treatments: The
26、chromate treatment (see 3.2.9) or the phosphate treatment (see 3.2.10) shall be applied directly after the coating operation to parts specified to be supplementary treated.3.2.9 Chromate treatment (Type II): Unless otherwise specified (see 6.2.1), the chromate treatment required for conversion to Ty
27、pe II shall be a treatment in or with an aqueous solution of salts, acids or both, to produce a continuous smooth, distinct protective film, distinctly colored iridescent bronze to brown including olive drab and yellow with the cadmium and zinc materials. The tin-cadmium material shall be acceptable
28、 even if the typical yellow or iridescent color is not evident. The articles so treated shall be thoroughly rinsed and dried in accordance with the process used. Type II coating shall be similar in appearance and adhesion to coatings on separate specimens which are capable of passing the saltspray t
29、est (see 3.3.5.1, 4.4.3.3, 4.4.4.2 and 4.5.4). Usual chromic acid and nitric acid bright dips are not chromate treatments.3.2.10 Phosphate treatment (Type III): Unless otherwise specified (see 6.2.1), the phosphate treatment required for conversion to Type III shall produce a tightly adherent film c
30、onforming to Type I of TT-C-490.3.3 Detail requirements: 3.3.1 Thickness: Unless otherwise specified (see 6.2.1), the coating thickness, as specified in the contract, purchase order or applicable drawing, on significant surfaces for each class of coating shall be as detailed in Table I. Significant
31、surfaces shall be all visible surfaces of the article which can be touched by a sphere 0.75 (19 mm) in diameter plus additional functional surfaces specified (see 6.2.1). Where Class 1 is specified, all other visible surfaces shall be Class 2 minimum thickness. If the maximum thickness for Class 1 i
32、s not specified in the contract, order or applicable drawing, the thickness for C and T coatings shall not exceed 0.0008 inch (20 microns). Where Class 2 is specified, all other visible surfaces shall be Class 3 minimum thickness, and for Z coatings, the minimum thickness for all other visible surfa
33、ces of Class 4 coatings shall be Class 5. The minimum thickness for all other visible surfaces of Class 3 C and T coatings shall be 0.00015 inch (4 microns) and 0.0002 inch (5 microns) for Class 5 Z coatings.SAE AMS-C-81562 Page 5 of 16 3.3.1.1 The coatings shall be Class 1 thickness, unless otherwi
34、se specified in the contract, order or controlled by the following exception (see 6.2.1):a. Bolts, studs, washers and articles with portions externally threaded shall have a minimum of Class 2 thickness on the threaded portions except for fine-threaded zinc coated parts which shall have a minimum of
35、 0.0003 inch (8 microns).b. Holes, other openings and articles with internal threads from which the external environment is completely excluded, shall not be subjected to a thickness requirement but shall show evidence of coating. There shall be no bare areas.3.3.1.2 Undercoat: When an undercoat is
36、used (see 3.2.4), the thickness of the copper or other suitable metal shall be less than 10 percent of the total coating thickness. The thickness of the undercoat shall not be included in the determination of the coating thickness.3.3.2 Types: Unless otherwise specified (see 6.2.1), coating shall be
37、 Type II. For use on surfaces to be painted, the coating shall be either Type II or Type III (see 6.1.1 and 6.1.2).3.3.3 Adhesion: The adhesion of the coating shall be such that when examined at a magnification of approximately 4X diameters, the coating shall not show separation from the basis metal
38、 or from any undercoating at the interface, nor shall any undercoat show separation from the basis metal at the interface when subjected to the tests described in 4.5.2. The interface between the coating and either the basis metal or the undercoat is the surface before coating. The interface between
39、 the undercoat and the basis metal is the surface before undercoating. The formation of cracks in the coating caused by rupture of the basis metal, the undercoat or combination of both which do not result in flaking, peeling or blistering of the coating shall not be considered as nonconformance to t
40、his requirement.3.3.4 Adhesion of Type II supplementary film: The adhesion of a Type II supplementary film to the coating shall be such that, when tested as detailed in 4.5.3, the supplementary chromate film shall not be removed or worn through to the underlying mechanically-deposited coating.3.3.5
41、Corrosion resistance: 3.3.5.1 Type II: Coatings with the Type II treatment shall show neither white corrosion products nor basis metal corrosion products at the end of the time periods shown in Table II, when tested by continuous exposure to the salt spray in accordance with 4.5.4. The appearance of
42、 corrosion products, visible to the unaided eye at normal reading distance, shall be cause for rejection, except that white corrosion products at the edges of specimens shall not constitute failure.3.3.5.2 Types I and III: When specified in the contract or order (see 6.2.1), coatings with either the
43、 Type I or Type III treatment shall show no corrosion products of the basis metal at the end of the time periods shown in Table II, when tested by continuous exposure to salt spray in accordance with 4.5.4. Any appearance of corrosion products of the basis metal shall be cause for rejection, except
44、that corrosion products at the edges of specimens shall not constitute failure.SAE AMS-C-81562 Page 6 of 16 3.3.6 Lubricating oil resistance (applicable to material T only): The material T coating shall withstand immersion in oil at a temperature of 121 3C (250 5F) for 24 hours without any wrinkling
45、, blistering, pitting or other surface defects. The adhesion of the coating shall be satisfactory. Upon cooling to room temperature, the coating shall not exhibit flaking when bent over a mandrel as described in 4.5.5.3.4 Workmanship: 3.4.1 Basis metal: The basis metal shall be free from visible def
46、ects that will be detrimental to the appearance or protective value of the coating. The basis metal shall be subject to such precleaning and mechanical coating procedures as necessary to yield coatings herein specified. All other visible surfaces shall have not less than the minimum thickness listed
47、 in the next higher class, except Class 6, which shall be not less than 0.00015 inch minimum thickness 3.4.1.1 Internally threaded parts: Internally threaded parts need not be retapped following the coating process, but should be oversized, prior to coating, to accommodate the coating mating part.3.
48、4.2 Coating: The coating shall be smooth, fine grained, adherent, uniform in appearance, free from blisters, pits, nodules, and other defects. Superficial staining, which has been demonstrated as resulting from rinsing, or slight discoloration resulting from any drying operation, shall not be cause
49、for rejection. All details of workmanship shall conform to the best practice for high quality coating.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for inspection: Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use
