SAE-AMS-2427D-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: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS 2427D AEROSPACE MATERIAL SPECIFICATION Issued JAN 1981 Revised JUL 2007 Superseding AMS 2427C Aluminum Coating Ion Vapor Deposition RATIONALE AMS 2427D results from a Five Year Review and update. NOTICE ORDERING I
5、NFORMATION: The following information shall be provided to the coating processor by the purchaser. 1) Purchase order shall specify not less than the following: AMS 2427D Coating thickness desired. See 3.4.1. If more than one thickness is required. See 3.2.2. If internal surfaces need coating. See 3.
6、4.1.2.1. Optional: Acceptance standards. See 3.5. Optional: Sample quantity and frequency of periodic testing. See 4.2.2 and 4.3.2. Optional: Statistical sampling plan. See 4.3.1.1. Optional: Corrosion test panel alloy. See 4.3.3.2. Whether approval is based on approval of process/control factors or
7、 sample part or both. See 4.4.1. Quantity of pieces to be coated 2) Parts manufacturing operations such as heat treating, forming, joining and media finishing can adversely affect the coated part. The sequencing of these types of operations should be specified by the cognizant engineering organizati
8、on or purchaser and is not controlled by this specification. Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:27:33 MSTNo reproduction or networking permitted without license from IHS -,-,- SAE AMS 2427D - 2 - 1. S
9、COPE 1.1 Purpose This specification covers the requirements for ion vapor deposited (IVD) aluminum on steel, titanium, and aluminum alloys. 1.2 Application This process has been used typically to improve corrosion resistance of ferrous parts operating at service temperatures up to 925 F (496 C) with
10、out the risk of hydrogen embrittlement and solid metal embrittlement, 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 specification may involve the use of hazardous materials, th
11、is 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 measures to ensure the health and safety of all personnel invol
12、ved. 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 unless a specific document issue is specified. When the refere
13、nced 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, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (
14、outside USA), www.sae.org. AMS 2473 Chemical Film Treatment for Aluminum Alloys, General Purpose Coating AS2390 Chemical 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,
15、www.astm.org. ASTM B 117 Operating Salt Spray (Fog) Testing Apparatus 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
16、 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 748 Measurement of Thickness of Metallic Coatings by Measurement of Cross Section with a Sca
17、nning Electron Microscope ASTM E 376 Measuring Coating Thickness by Magnetic-Field or Eddy Current (Electromagnetic) Test Methods Copyright SAE International Provided by IHS under license with SAELicensee=Defense Supply Ctr/5913977001 Not for Resale, 12/04/2007 18:27:33 MSTNo reproduction or network
18、ing permitted without license from IHS -,-,- SAE AMS 2427D - 3 - 3. TECHNICAL REQUIREMENTS 3.1 Preparation 3.1.1 Ferrous parts having a tensile strength of 220 ksi (1517 MPa) or greater shall not be subjected to any hydrogen embrittling process, such as exposure to an acid, cathodic cleaning, etchin
19、g, or to a corrosive environment. 3.1.2 Aluminum or corrosion-resistant steel foil or specially configured aluminum or corrosion-resistant steel masking or plugs shall be used to mask areas where the coating is not desired. Aluminum tape may be used where it is not practical to use foil. The quantit
20、y of aluminum tape used shall be minimized. 3.1.3 The coating shall be deposited over a dry surface free from water breaks. 3.2 Procedure 3.2.1 The coating shall be applied directly to the basis metal by the deposition of vaporized metallic aluminum, from wire of 99.0% minimum purity, on parts which
21、 are made the cathode of a high voltage system within a suitable low pressure gas (vacuum) environment. 3.2.2 When more than one coating thickness is required on a part, the application procedure shall be acceptable to the cognizant engineering organization. 3.2.3 The temperature of the parts during
22、 deposition of the coating shall be controlled so as not to reduce hardness of titanium and aluminum alloy parts by more than two HRBs and of steel parts to below the minimum of the specified hardness. See 8.2. 3.2.4 The IVD coating shall be compacted by glass or ceramic bead peening to obtain a coa
23、ting essentially free from porosity. Interconnected porosity results from under-peening while over-peening can reduce the thickness or remove the IVD coating from the substrate. Process controls shall ensure a coherent coating is produced with no cuts or gouges or embedded media from broken or shatt
24、ered beads. See 8.5. 3.2.5 Application of IVD aluminum coating over IVD aluminum coating is prohibited. 3.2.6 Proper glass or ceramic bead size, blast pressure, and nozzle working distance shall be established prior to production. Special blasting controls shall be instituted as required to ensure a
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