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 reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2012 SAE International All rights reserved. No part of this publication m
3、ay 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: +1 724-776-4970 (outside U
4、SA) 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/AMS2451/9B AEROSPACE MATERIAL SPECIFICATION AMS2451/9 REV. B Issued 2002-01 Reaffirmed 2011-0
5、4 Revised 2012-09 Superseding AMS2451/9A Plating, Brush, Zinc-Nickel Low Hydrogen Embrittlement RATIONALE This revision allows use of Type 1a.2 notched specimens as an alternative to Type 1a.1 for testing per ASTM F 519, and also adds a provision for batch control of plating solution. 1. SCOPE 1.1 P
6、urpose This specification covers the requirements for brush plating of zinc-nickel by electrodeposition. 1.2 Application This process has been used typically to improve corrosion resistance of steel parts operating under 500 F (260 C) as-plated or under 250 F (121 C) when chromate treated, to repair
7、 zinc-nickel deposits and to repair damaged or worn parts, but usage is not limited to such applications. 1.3 Classification Type 1 - As-plated Type 2 - With supplementary surface treatment 1.3.1 Unless a specific type is specified, Type 1 shall be supplied. 1.4 Safety - Hazardous Materials See AMS2
8、451. 2. APPLICABLE DOCUMENTS See AMS2451. 3. TECHNICAL REQUIREMENTS See AMS2451. SAE AMS2451/9B Page 2 of 3 3.1 Procedure 3.1.1 Zinc-nickel alloy plate shall be electrodeposited from low-hydrogen-embrittlement brush plating solution in accordance with processing instructions from the solution manufa
9、cturer. When Type 2 plating is specified, the supplementary coating shall be applied using brush, spray or dip. 3.1.2 When specified by the cognizant engineering organization, the hydrogen embrittlement relief baking requirement of AMS2451 may be waived. See 8.4. 3.2 Properties 3.2.1 Composition The
10、 zinc-nickel alloy deposit shall contain 6 to 20% nickel and the balance essentially zinc, determined by a method agreed upon by purchaser and processor. 3.2.2 Nickel Strike When applied, shall be not less than 0.00005 inch (1.3 m) thick. 3.2.3 Corrosion Resistance The requirements of AMS2451 shall
11、apply except that salt spray exposure time shall be 500 hours 1. Specimens shall be plated to a thickness of 0.0004 to 0.0007 inch (10 to 18 m). 3.2.3.1 Type 2 parts shall show no evidence of corrosion products after 96 hours and no evidence of basis metal corrosion after 500 hours exposure to salt
12、spray corrosion test in accordance with ASTM B 117. 3.2.4 The hardness, stress, and heat resistance tests of AMS2451 section 3.4.2 are not applicable to this deposit. 3.2.5 Hydrogen Embrittlement The plating process shall not cause hydrogen embrittlement in steel parts, determined in accordance with
13、 4.2. 4. QUALITY ASSURANCE PROVISIONS See AMS2451. 4.1 When specified by the cognizant engineering organization, the hydrogen embrittlement relief testing of 4.2 may be waived. See 8.4. 4.2 Hydrogen Embrittlement Test Test shall be in accordance with the requirements of ASTM F 519 using three Type 1
14、a.1 or Type 1a.2 notched specimens stressed in tension under constant load, unless a different specimen is specified by the purchaser. For test purposes, the plating thickness shall be 0.0003 to 0.0006 inch (8 to 15 m) measured on the smooth section of the specimen, but with visual plating at the ro
15、ot of the notch. 4.3 Periodic Tests Hydrogen embrittlement (4.2) is a periodic test and shall be performed at least once each month that parts are processed, unless the solution is batch controlled and the batch has been previously tested and passed the hydrogen embrittlement test of AMS2451 section
16、 4.3.3.3. Each individual batch shall be tested in accordance with AMS2451 section 4.3.3.3 and given an expiration date or shelf-life from date of testing and be so noted on the solution bottle label. Tests of cleaning and plating solutions are periodic tests and shall be performed at a frequency es
17、tablished by the processor unless frequency of testing is specified by cognizant engineering organization. SAE AMS2451/9B Page 3 of 3 5. PREPARATION FOR DELIVERY See AMS2451. 6. ACKNOWLEDGMENT See AMS2451. 7. REJECTIONS See AMS2451. 8. NOTES 8.1 A change bar (l) located in the left margin is for the
18、 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 indicates a complete revision of the document, including technical revisions. Change bars and (R) are no
19、t used in original publications, nor in documents that contain editorial changes only. 8.2 The Notes of AMS2451 shall apply as herein modified, deleted, or added to. 8.3 Plating meeting the requirements of this specification will meet the requirements of AMS2417. 8.4 An acceptable rationale for exem
20、pting 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 4.2. The cognizant engineering organization should specify the procedure by which the processor may qualify for such an exemption and any circumstances that may be cause for requalification. PREPARED BY AMS COMMITTEE “B”
