SAE-AMS-2406L-2007.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 2007 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: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org AMS 2406L AEROSPACE MATERIAL SPECIFICATION Issued NOV 1946 Revised MAY 2007 Superseding AMS 2406K Plating, Chromium Hard Deposit RATIONALE AMS 2406L results from a Five Year Review and update of this specification. NOTICE ORD
5、ERING INFORMATION: The following information shall be provided to the plating processor by the purchaser. 1) Purchase order shall specify not less than the following: AMS 2406L Plating thickness desired (see 3.4.1) Basis metal to be plated Tensile strength or hardness of the basis metal Pre-plate st
6、ress 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 by the plating processor Hydrogen embrittlement relief to be performed by plating processor (parameters or referen
7、ce document) if different from 3.3. Minimum thickness on internal surfaces, if required (see 3.4.1.1) Optional: Sample quantity and frequency of periodic testing (see 4.2.2 and 4.3.2) Whether approval is based on approval of process/control factors or sample part or both (see 4.4.1) Quantity of piec
8、es 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 these types of operations should be specified
9、by the cognizant engineering organization or purchaser and is not controlled by this specification. SAE AMS 2406L - 2 - 1. SCOPE 1.1 Purpose This specification covers the requirements for electrodeposited hard chromium plate. 1.2 Application This plating has been used typically on parts for increasi
10、ng abrasion resistance, increasing tool and die life, maintaining accuracy of gauges, and reconditioning worn or undersized parts, but usage is not limited to such applications. 1.3 Safety-Hazardous Materials While the materials, methods, applications, and processes described or referenced in this s
11、pecification 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 materials and to take necessary precautionary meas
12、ures 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 work to a subsequent revision of a document unl
13、ess a specific document issue is specified. When the referenced document has been canceled 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,
14、Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS 2759/9 Hydrogen Embrittlement Relief (Baking) of Steel 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.ast
15、m.org. ASTM B 253 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
16、 504 Measurement of Thickness of Metallic Coatings by the Coulometric Method ASTM B 567 Method for Measurement of Coating Thickness by the Beta Backscatter Method ASTM B 568 Measurement of Coating Thickness by X-Ray Spectrometry ASTM B 571 Qualitative Adhesion of Metallic Coatings ASTM B 578 Microha
17、rdness of Electroplated Coatings ASTM F 519 Mechanical Hydrogen Embrittlement Evaluation of Plating Processes and Service Environments ASTM B 748 Measurement of Thickness of Metallic Coatings by Measurement of Cross Section with a Scanning Electron Microscope -,-,- SAE AMS 2406L - 3 - 3. TECHNICAL R
18、EQUIREMENTS 3.1 Preparation 3.1.1 Steel parts having hardness over 40 HRC and which have been ground, machined, cold formed, or cold straightened after heat treatment shall be cleaned to remove surface contamination and stress-relieved before preparation for plating. Temperatures to which parts are
19、heated shall be such that maximum stress relief is obtained without reducing hardness of parts below drawing limits, but, unless otherwise specified, the stress relief shall be not less than 275 F (135 C) for five hours for parts with hardness of 55 HRC or higher or not less than 375 F (191 C) for f
20、our hours for other parts. 3.1.2 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. 3.1.3 Except for barrel plating, electrical contact points sha
21、ll be as follows. For parts which are to be plated all over, location shall be acceptable to the cognizant engineering organization; for parts which are not to be plated all over, location shall be in areas where plating is optional. 3.1.4 Aluminum alloys shall be zincate treated in accordance with
22、ASTM B 253 or other method acceptable to the cognizant engineering organization prior to plating. 3.2 Procedure 3.2.1 The chromium shall be deposited directly over a surface free from water breaks without a coating of other metal underneath, except in the case of parts made of maraging steels, corro
23、sion-resistant steels, or aluminum alloys, on which a preliminary deposit of nickel or other suitable metal 0.0002 inch (5 m) thickness maximum is permissible. 3.3 Hydrogen Embrittlement Relief Treatment of steel parts 36 HRC and above shall be in accordance with AMS 2759/9. 3.4 Properties: 3.4.1 Th
24、ickness Thickness of the plate shall be as specified on the drawing, determined in accordance with any of the following methods as applicable: ASTM B 487, ASTM B 499, ASTM B 567, ASTM B 568, ASTM B 748, or by other method acceptable to the cognizant engineering organization. 3.4.1.1 The plate shall
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