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 2017 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:/standards.sae.org/AMS2451/4D AEROSPACE MATERIAL SPECIFICATION AMS2451/4 REV. D Issued 1998-07 Revised 2017-12 Sup
5、erseding AMS2451/4C Plating, Brush, Cadmium Corrosion Protective, Low Hydrogen Embrittlement RATIONALE AMS2451/4D results from a Five-Year Review and update of this specification with changes to hydrogen embrittlement paragraphs 3.1.2 and 3.2.2. 1. SCOPE 1.1 Purpose This specification establishes th
6、e 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 particularly useful when prevention of hydrogen embrittlement of high-strength steel parts or asse
7、mblies is sought. 1.3 Safety - Hazardous Materials Shall be in accordance with AMS2451. 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 countries due to environmental and health concerns. The user should consult w
8、ith local officials on applicable health and environmental regulations regarding its use. 2. APPLICABLE DOCUMENTS In addition to those listed in AMS2451, 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
9、. The supplier may work 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. SAE INTERNATIONAL AMS2451/4D Page 2 of
10、3 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2400 Plating, Cadmium AMS2401 Plating, Cadmium, Low Hydrogen Content Deposit AMS-QQ-P-416 Plating, C
11、admium (Electrodeposited) 3. TECHNICAL REQUIREMENTS Shall be in accordance with AMS2451 and as follows. 3.1 Procedure 3.1.1 Cadmium shall be electrodeposited from low-hydrogen-embrittlement brush plating solution in accordance with processing instructions from the solution manufacturer. 3.1.2 Hydrog
12、en embrittlement relief shall be in accordance with AMS2451. 3.2 Properties 3.2.1 Corrosion Resistance The requirements of AMS2451 shall apply except that salt spray exposure time shall be 250 hours 1 hour. Specimens shall be plated to a thickness of 0.0003 to 0.0006 inches (8 to 16 m). Specimens sh
13、all 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 shall receive the same treatment. 3.2.2 Hydrogen Embrittlement The plating process shall not cause hydrogen embrittlement in steel parts 36 HRC and o
14、ver, determined in accordance with 4.1. When specified by the cognizant engineering organization, this requirement may be waived (see 8.3). 4. QUALITY ASSURANCE PROVISIONS Shall be in accordance with AMS2451. 5. PREPARATION FOR DELIVERY Shall be in accordance with AMS2451. 6. ACKNOWLEDGMENT Shall be
15、 in accordance with AMS2451. 7. REJECTIONS Shall be in accordance with AMS2451. SAE INTERNATIONAL AMS2451/4D Page 3 of 3 8. NOTES See AMS2451 and as follows. 8.1 Plating meeting the requirements of this specification will exhibit equivalent properties to plating produced in accordance with AMS-QQ-P-
16、416, AMS2400, and AMS2401. 8.2 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title
17、indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.3 An acceptable rationale for exempting the processor from performance of hydrogen embrittlement relief baking and testing is for the processor to demonstrate that unbaked test specimens pass the hydrogen embrittlement relief test requirements of 3.2.2. PREPARED BY AMS COMMITTEE “B”
