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: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS 2451/4B AEROSPACE MATERIAL SPECIFICATION Issued 1998-07 Revised 2007-10 Superseding AMS 2451/4A Plating, Brush, Cadmium Corrosion Protective, Low Hydrogen Embrittlement RATIONALE AMS 2451/4B results from a Five Ye
5、ar Review and update of this specification. 1. SCOPE 1.1 Purpose This specification establishes the requirements for brush plating of cadmium by electrodeposition. 1.2 Application This process has been used typically to apply a corrosion-protective coating and to repair damaged or worn parts. It is
6、particularly useful when prevention of hydrogen embrittlement of high-strength steel parts or assemblies is sought. 1.3 Safety - Hazardous Materials See AMS 2451. 1.4 Warning This document includes cadmium as a plating material. The use of cadmium has been restricted and/or banned for use in many co
7、untries due to environmental and health concerns. The user should consult with local officials on applicable health and environmental regulations regarding its use. 2. APPLICABLE DOCUMENTS See AMS 2451. 3. TECHNICAL REQUIREMENTS See AMS 2451. 3.1 Procedure 3.1.1 Cadmium shall be electrodeposited fro
8、m low-hydrogen-embrittlement brush plating solution in accordance with processing instructions from the solution manufacturer. 3.1.2 Steel parts, heat treated to 180 ksi (HRC 40) minimum or higher, shall be embrittlement relieved in accordance with AMS 2759/9 unless plated specimens have passed the
9、hydrogen embrittlement test of AMS 2451. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS 2451/4B - 2 - 3.2 Properties 3.2.1 Corrosion Resistance The requirements of AMS 2451 shall apply excep
10、t that salt spray exposure time shall be 250 hours 1. Specimens shall be plated to a thickness of 0.0003 to 0.0006 inches (8 to 16 m). Specimens shall not be heated before exposure to salt spray unless parts receive a hydrogen embrittlement relief treatment (see 3.1.2) in which case the specimens sh
11、all receive the same treatment. 4. QUALITY ASSURANCE PROVISIONS See AMS 2451. 5. PREPARATION FOR DELIVERY See AMS 2451. 6. ACKNOWLEDGMENT See AMS 2451. 7. REJECTIONS See AMS 2451. 8. NOTES See AMS 2451. 8.1 Plating meeting the requirements of this specification will exhibit equivalent properties to plating produced in accordance with QQ-P-416, AMS 2400, and AMS 2401. PREPARED BY AMS COMMITTEE “B” Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
