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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (outside USA) 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/AMS2422F AEROSPACE MATERIAL SPECIFICATION AMS2422 REV. F Issued 1958-01 Reaffirme
5、d 2007-04 Revised 2014-02 Superseding AMS2422E Plating, Gold RATIONALE AMS2422F results from a Five Year Review and update of this specification. NOTICE ORDERING INFORMATION: The following information shall be provided to the plating processor by the purchaser. 1) Purchase order shall specify not le
6、ss than the following: AMS2422F Plating thickness desired. See 3.4.1. Minimum thickness on internal surfaces, if required. See 3.4.1.1. Basis metal to be plated Tensile strength or hardness of the basis metal this would not apply to Aluminum Pre-plate stress relief to be performed by plating process
7、or (time and temperature) if different from 3.1.2 Special features, geometry or processing present on parts that requires special attention by the plating processor Hydrogen embrittlement relief to be performed by plating processor (parameters or reference document) if different from 3.3. Solderabil
8、ity when required. See 3.4.3. Quantity of pieces to be plated 2) Parts manufacturing operations such as heat treating, forming, joining and media finishing can affect the condition of the substrate for plating, or if performed after plating, could adversely affect the plated part. The sequencing of
9、these types of operations should be specified by the cognizant engineering organization or purchaser and is not controlled by this specification. 1. SCOPE 1.1 Form This specification covers the requirements for electrodeposited gold plate. SAE INTERNATIONAL AMS2422F Page 2 of 8 1.2 Application This
10、plating has been used typically to improve the solderability, electrical conductivity, corrosion resistance, performance, and appearance of electronic and electrical parts, but usage is not limited to such applications. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and
11、 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 materi
12、als 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 wor
13、k 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 Co
14、mmonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2750 Pyrometry AMS2759/9 Hydrogen Embrittlement Relief (Baking) of Steel Parts AS2390 Chemical Process Test Specimen Material 2.2 ASTM Publications Available from AST
15、M International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 117 Operating Salt Spray (Fog) Testing Apparatus ASTM B 253 Preparation of Aluminum Alloys for Electroplating ASTM B 487 Measurement of Metal and Oxide Coating Thicknesses
16、 by Microscopical Examination of a Cross Section ASTM B 499 Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals ASTM B 504 Measurement of Thickness of Metallic Coatings by the Coulometric Method ASTM B 567 Measurement of Coating Thickness by the B
17、eta Backscatter Method ASTM B 568 Measurement of Coating Thickness by X-Ray Spectrometry ASTM B 571 Adhesion of Metallic Coatings ASTM E 376 Measuring Coating Thickness by Magnetic-Field or Eddy-current (Electromagnetic) Test Methods ASTM F 519 Mechanical Hydrogen Embrittlement Evaluation of Plating
18、 Processes and Service Environments SAE INTERNATIONAL AMS2422F Page 3 of 8 2.3 ANSI Publications Available from American National Standards Institute, 25 West 43rd Street, New York, NY 10036-8002, Tel: 212-642-4900, www.ansi.org. ANSI B46.1 Surface Texture 3. TECHNICAL REQUIREMENTS 3.1 Preparation 3
19、.1.1 Surfaces to be plated, prior to cleaning, shall be not rougher than 32 microinches (0.8 m), determined in accordance with ANSI B46.1. 3.1.2 All steel parts having a hardness of 40 HRC and above and that are machined, ground, cold formed or cold straightened after heat treatment shall be cleaned
20、 to remove surface contamination and thermally stress relieved before plating. (Residual tensile stresses have been found to be damaging during electroplating.) Furnaces used for stress relief shall be controlled per AMS2750. The minimum requirements shall be Class 5, with Type D Instrumentation. Te
21、mperatures to which parts are heated shall be such that stress relief is obtained while still maintaining hardness of parts within drawing limits. Unless otherwise specified, the following treatment temperatures and times shall be used:. 3.1.2.1 For parts, excluding nitrided parts, having a hardness
22、 of 55 HRC and above, and for carburized and induction hardened parts, stress relieve at 275 F 25 (135 C 14) for 5 to 10 hours. 3.1.2.2 For parts having a hardness less than 55 HRC, and for nitrided parts, stress relieve at 375 F 25 (191 C 14) for a minimum of 4 hours. Higher temperatures shall be u
23、sed only when specified or approved by the cognizant engineering organization. 3.1.2.3 For peened parts: If stress relief temperatures above 375 F (191 C) are elected, the stress relieve shall be performed prior to peening or the cognizant engineering organization shall be consulted and shall approv
24、e the stress relief temperature. 3.1.3 The plating shall be applied over a surface free from water breaks. The cleaning procedure shall not produce pitting or intergranular attack of the basis metal and shall preserve dimensional requirements. 3.1.4 Except for barrel plating, electrical contact poin
25、ts shall be as follows. For parts that are to be plated all over, locations shall be acceptable to the cognizant engineering organization. For parts that are not to be plated all over, locations shall be in areas on which plating is not required. 3.2 Procedure Parts shall be plated in the following
26、sequence using the solution specified; parts shall be immersed in each plating solution with the current on. 3.2.1 Copper Flash or Copper Strike A copper flash or copper strike shall be electrodeposited from a suitable plating solution, except as exempted in 3.2.1.1. 3.2.1.1 When parts to be plated
27、are made of copper or copper alloy containing less than 15% zinc, the copper flash or copper strike may be omitted. 3.2.2 Nickel Flash or Nickel Strike A nickel flash or nickel strike shall be electrodeposited from a suitable nickel plating solution over the copper, copper alloy containing less than
28、 15% zinc, copper flash, or copper strike as applicable. SAE INTERNATIONAL AMS2422F Page 4 of 8 3.2.3 Prior to plating, aluminum alloys shall be zincate or stannate treated in accordance with ASTM B 253 or other method acceptable to the cognizant engineering organization. 3.2.4 Gold Plating Parts sh
29、all be plated by electrodeposition of gold from a suitable solution directly onto the nickel strike. 3.2.5 Plated springs may be removed from the plating racks after rinsing provided they are not flexed prior to embrittlement relief. 3.2.6 Spotting-in is not permitted. 3.3 Hydrogen Embrittlement Rel
30、ief Treatment of steel parts shall be in accordance with AMS2759/9. 3.4 Properties The deposit shall conform to the following requirements: 3.4.1 Thickness Unless otherwise specified on the drawing, thickness of plating shall be as follows, determined in accordance with ASTM B 487, ASTM B 499, ASTM
31、B 504, ASTM B 567, ASTM B 568, ASTM E 376, or other method acceptable to the cognizant engineering organization. 3.4.1.1 All surfaces of the part, except those that cannot be touched by a sphere 0.75 inch (19 mm) in diameter, shall be plated to the specified thickness. Unless otherwise specified, su
32、rfaces such as holes, recesses, threads and other areas where a controlled deposit cannot be obtained under normal plating conditions, may be under the specified limit provided they show visual plating coverage. 3.4.1.2 Copper Flash or Strike Not less than 0.0001 inch (2.5 m). 3.4.1.3 Nickel Strike
33、Not less than 0.0001 inch (2.5 m). 3.4.1.4 Gold Plate Not less than 0.00005 inch (1.27 m) on all surfaces on which gold plating is specified. See 8.2. 3.4.2 Adhesion Adhesion shall meet the requirements of ASTM B 571 when tested in accordance with the heat quench method described in ASTM B 571. 3.4.
34、3 Solderability When specified, the plate shall demonstrate acceptable solderability after being fluxed with a suitable noncorrosive rosin flux (RA), immersed for 3 to 5 seconds in a molten solder bath containing 60Sn-40Pb solder at 550 F 10 (288 C 6), removed and shaken lightly. The solder coating
35、shall be uniform and free from lumps, and dewetted areas, and shall not flake or peel when tested in accordance with 3.4.2. 3.4.4 Purity Gold, as plated, shall be not less than 99.0% pure, determined by a method acceptable to the cognizant engineering organization. SAE INTERNATIONAL AMS2422F Page 5
36、of 8 3.4.5 Corrosion Resistance Plated parts or representative test panels as in 4.3.2 shall show no visual evidence of corrosion of the basis metal after being subjected for 24 hours to continuous salt spray corrosion test conducted in accordance with ASTM B 117. 3.4.6 Hydrogen Embrittlement The pl
37、ating process after baking shall not cause hydrogen embrittlement in steel parts 36 HRC and over determined in accordance with 4.3.2.3. For test purposes, plating thickness shall be 0.0005 to 0.0007 inch (13 to 18 m), measured on the smooth section of the specimen, but with visual plating in the roo
38、t of the notch. 3.5 Quality Plating shall be smooth, continuous, free of delaminations within the plating, uniform in appearance, and free of imperfections detrimental to usage of the plating. Plating shall be visually free from frosty areas, pinholes, porosity, blisters nodules, and pits. 4. QUALIT
39、Y ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The processor shall supply all samples and shall be responsible for the performance of all required tests. When parts are to be tested, such parts shall be supplied by purchaser. The cognizant engineering organization reserves the right to sam
40、ple and to perform any confirmatory testing deemed necessary to ensure that processing conforms to the requirements of this specification. 4.2 Classification of Tests 4.2.1 Acceptance Tests Thickness (3.4.1), adhesion (3.4.2), solderability, when specified (3.4.3), and quality (3.5) are acceptance t
41、ests and shall be performed on parts, or specimens representing parts when permitted herein from each lot. See 4.3.2. 4.2.2 Periodic Tests Purity (3.4.4), and corrosion resistance (3.4.5) are periodic tests and shall be performed monthly Tests of cleaning and processing solutions are periodic tests
42、and shall be performed at a frequency established by the processor unless frequency of testing is specified by the cognizant engineering organization. See 8.6 and 4.4.3. Hydrogen embrittlement (3.4.6) is a periodic test and shall be performed in accordance with 4.3.2.3 at least once in each month th
43、at steel parts 36 HRC and over are plated unless frequency of testing is specified by the cognizant engineering organization. 4.2.2.1 Periodic testing may be suspended in any test period when parts are not processed; however, preproduction testing may be required by the cognizant quality organizatio
44、n upon resumption of processing. 4.2.3 Preproduction Tests All property verification tests (section 3.4) are preproduction tests and shall be performed prior to production and when the cognizant engineering organization requires confirmatory testing. 4.3 Sampling for Testing Test samples shall be ra
45、ndomly selected from all parts in the lot. A lot shall be all parts of the same part number, processed in a continuous series of operations (3.2), in not longer than 24 consecutive hours, and presented for processors inspection at one time. Unless the cognizant engineering organization provides a sa
46、mpling plan, the minimum number of samples shall be as shown in Table 1. SAE INTERNATIONAL AMS2422F Page 6 of 8 TABLE 1 - SAMPLING FOR ACCEPTANCE TESTING Number of Parts in Lot Quality Thickness and Adhesion Solderability, When Specified Up to 7 All 3 or all* 1 8 to 15 7 4 2 16 to 40 10 4 2 41 to 11
47、0 15 5 3 111 to 300 25 6 3 301 to 500 35 7 4 501 to 700 50 8 4 701 to 1200 75 6 *Whichever is less 4.3.1 Periodic Tests Sample quantity shall be at the discretion of the processor unless specified by the cognizant engineering organization. 4.3.2 Sample Configuration 4.3.2.1 Nondestructive testing sh
48、all be performed wherever practical. Except as noted, actual parts shall be selected as samples for tests. When representative specimens are used for acceptance testing, values so obtained shall be correlated with those of parts since properties, such as thickness, may differ between parts and repre
49、sentative test specimens. Representative test specimens may be used in lieu of parts under any one of the following circumstances: The plated parts are of such configuration or size as to be not readily adaptable to specified tests, nondestructive testing is not practical on actual parts, or it is not economically acceptable to perform destructive tests on actual parts. Except as spec
