SAE-AMS-2408J-2008.pdf
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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 2008 SAE International All rights reserved. No part of this publication ma
3、y 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: 724-776-4970 (outside USA)
4、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/AMS2408J AMS2408J AEROSPACE MATERIAL SPECIFICATION Issued 1946-11 Revised 2008-11 Superseding AMS
5、2408H Plating, Tin RATIONALE AMS2408J 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 less than the following: ? AMS2408J ? Platin
6、g thickness (3.4.1) ? Basis metal to be plated ? Tensile strength or hardness of the basis metal ? Pre-plate stress relief to be performed by plating processor (time and temperature) if different from 3.1.1 ? Special features, geometry or processing present on parts that requires special attention b
7、y the plating processor ? Hydrogen embrittlement relief to be performed by plating processor (parameters or reference document) if different from 3.3.1 ? Minimum thickness on internal surfaces, if required (3.4.1.4) ? Optional: Reflow of plating (3.3.1.1) ? Optional: Solderability (3.4.3) ? Optional
8、: Porosity if required as an acceptance test (3.4.4) ? Optional: Periodic testing frequency (4.2.2) and sample quantity (4.3.2) ? Quantity of pieces to be plated * Optional: Requirements for the prevention of tin whiskers ( 3.1.5) 2) Parts manufacturing operations such as heat treating, forming, joi
9、ning 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 these types of operations should be specified by the cognizant engineering organization or purchaser and is not controlled by this
10、specification. SAE AMS2408J - 2 - 1. SCOPE 1.1 Purpose This specification covers the requirements for electrodeposition of tin on metals and the properties of the deposit. 1.2 Application This process has been used typically to prevent galling or seizing of metal surfaces, to provide a surface for s
11、oft soldering, or to improve corrosion resistance, but usage is not limited to such applications (See 8.6). 1.3 Safety Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of hazardous materials, this specific
12、ation 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 materials and to take necessary precautionary measures to ensure the health and safety of all personnel involved. 2. APP
13、LICABLE 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 work to a subsequent revision of a document unless a specific document issue is specified. When the referenced docume
14、nt 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 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside US
15、A), www.sae.org. AMS2759/9 Hydrogen Embrittlement Relief (Baking) of Steel Parts AS2390Chemical Process Test Specimen Material 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 253
16、Preparation of Aluminum Alloys for Electroplating ASTM B 487 Measurement of Metal and Oxide Coating Thicknesses 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 o
17、f Thickness of Metallic Coatings by the Coulometric Method ASTM B 545 Electrodeposited Coatings of Tin ASTM B 568 Measurement of Coating Thickness by X-Ray Spectrometry ASTM B 571 Qualitative Adhesion Testing of Metallic Coatings ASTM E 376 Measuring Coating Thickness by Magnetic-Field or Eddy-Curre
18、nt (Electromagnetic) Examination Methods -,-,- SAE AMS2408J - 3 - 3. TECHNICAL REQUIREMENTS 3.1 Preparation 3.1.1 Steel parts having a hardness of 40 HRC or higher and which have been ground after heat treatment shall be cleaned to remove surface contamination and stress relieved before preparation
19、for plating. Unless otherwise specified, the stress relief shall be 275 F 25 (135 C 14) for not less than 5 hours for parts with hardness of 55 HRC or greater and 375 F 25 (191 C 14) for not less than 4 hours for other parts. 3.1.2 The plating shall be applied over a surface free from water breaks.
20、The cleaning procedure shall not produce pitting or intergranular attack of the basis metal and shall preserve dimensional requirements. 3.1.3 Parts shall be within drawing limits before plating, except as specified in 3.1.3.1. 3.1.3.1 All engine and propeller utility parts, having part numbers with
21、 the prefix AN, MS, or AS, required to be plated in accordance with this specification shall be made to such dimensions that parts will be within drawing limits after plating. Undercutting before plating shall not be permitted, unless specifically authorized by the cognizant engineering organization
22、. 3.1.4 Except for barrel plating, electrical contact points shall be as follows. For parts which are to be plated all over, locations shall be acceptable to purchaser; for parts which are not to be plated all over, locations shall be in areas on which plating is not required. 3.1.5 For electronic p
23、arts where tin plate becomes the final coating, the plating process and control factors shall be controlled in accordance with 4.4 to minimize or eliminate the propensity for tin whisker formation and growth. See 8.6. 3.2 Procedure 3.2.1 Except as stated in 3.2.1.2 or 3.2.2, tin shall be electrodepo
24、sited directly on the basis metal from a suitable tin plating bath. 3.2.1.1 Spotting-in and double plating are prohibited. 3.2.1.2 Aluminum and aluminum alloys shall be zinc treated in accordance with ASTM B 253 or other method acceptable to the cognizant engineering organization prior to plating. 3
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