1、AEROSPACE MATERIAL SPECIFICATIONAMS 2409GIssued 1948-05Revised 2001-02Superseding AMS 2409FPlating, Immersion TinFor Aluminum Alloys1. SCOPE:1.1 Purpose:This specification covers the engineering requirements for producing a thin tin coating on aluminum alloys by an immersion process.1.2 Application:
2、This process has been used typically to prevent scuffing and galling of aluminum alloy 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 specification may involve the use of
3、 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 measures to ensure the health and safet
4、y 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 unless a specific document issue is sp
5、ecified. When the referenced document has been canceled and no superseding document has been specified, the last published issue of that document shall apply.Reaffirmed 2009-06 SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and en
6、gineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it m
7、ay be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2009 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopy
8、ing, 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) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedbac
9、kon this Technical Report, please visit http:/www.sae.org/technical/standards/AMS2409G Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 2409G SAE AMS 2409G- 2 -2.1 ASTM Publications: Available fro
10、m ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM B 487 Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of a Cross SectionASTM B 567 Measurement of Coating Thickness by the Beta Backscatter MethodASTM B 568 Measurement of Coating Thickness by X-Ray Sp
11、ectrometry3. TECHNICAL REQUIREMENTS: 3.1 Plating Bath: Shall consist of an aqueous solution of stannate salts.3.2 Operating Parameters: Temperature of bath, pH, solution concentration, and immersion time shall be controlled to provide a deposit meeting the requirements of 3.5.3.3 Preparation:Parts s
12、hall have clean surfaces free of waterbreak prior to immersion in the plating solution. Parts shall be transferred to plating solution without drying after rinsing.3.4 Procedure:3.4.1 Parts shall be immersed in the plating bath and shall remain in the bath until reaction is essentially complete, as
13、indicated by virtual cessation of evolution of hydrogen.3.4.1.1 Parts shall not be allowed to dry during the entire sequence of operations until completion of the final rinse.3.4.1.2 After plating, parts shall be thoroughly rinsed and dried.3.5 Properties:Plated tin shall conform to the following re
14、quirements:3.5.1 Thickness: The plate thickness shall be approximately 0.0001 inch (2.5 m), determined in accordance with ASTM B 487, ASTM B 567, ASTM B 568, or other method acceptable to purchaser.3.5.2 Adhesion: Plated parts shall show no blisters after being heated in a circulating-air oven to 30
15、0 F 15 (149 C 8) and held at heat for not less than three hours.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 2409G SAE AMS 2409G- 3 -3.5.2.1 When acceptable to purchaser, adhesion may be deter
16、mined by scratching the plated surface with a sharp point. When examined at 4 to 6X magnification, there shall be no evidence of flaking of the plating (See 4.3.3).3.6 Quality:Plated tin, as received by purchaser, shall be smooth, continuous, adherent to basis metal, uniform bright gray in appearanc
17、e, and free from blisters and other imperfections detrimental to usage of the plating. Slight staining or discoloration is permissible.4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The processor shall supply all samples for processors tests and shall be responsible for the perf
18、ormance of all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that processing conforms to the specified requirements.4.2 Classification of Tests: 4.2.1 Acceptance Tests: Adhesion (3.5.2 or 3.5.2.1, as applicable) and quality
19、(3.6) are acceptance tests and shall be performed to represent each lot.4.2.2 Periodic Tests: Thickness (3.5.1) and tests of cleaning and plating solutions (See 8.4) are periodic tests and shall be performed at a frequency selected by the vendor unless frequency of testing is specified by purchaser.
20、4.2.3 Preproduction Tests: All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of plated parts to a purchaser, when a change in material and/or processing requires approval by the cognizant engineering organization (See 4.4.2), and when purch
21、aser deems confirmatory testing to be required.4.3 Sampling and Testing: Shall be not less than the following; a lot shall be all plated parts made of the same aluminum alloy of the same part number plated in the same solution(s) in not longer than eight consecutive hours and presented for processor
22、s inspection at one time:4.3.1 For Acceptance Tests: As shown in Table 1.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 2409G SAE AMS 2409G- 4 -4.3.2 For Periodic Tests and Preproduction Tests:
23、Sample quantity shall be at the discretion of the processor unless otherwise specified by purchaser.4.3.3 When plated parts are of such configuration or size as to be not readily adaptable to the specified tests or when nondestructive testing is not practical on actual parts, or it is not economical
24、ly acceptable to perform destructive tests on actual parts, separate test specimens of the same generic class of alloy as the parts represented, cleaned and plated with the parts represented may be used.4.4 Approval:4.4.1 The process and control factors, a preproduction sample, or both, whichever is
25、 specified by purchaser, shall be approved by the cognizant engineering organization before production parts are supplied.4.4.2 The processor shall make no significant change to materials, processes, or control factors from those on which the approval was based, unless the change is approved by the
26、cognizant engineering organization. A significant change is one which, in the judgement of the cognizant engineering organization, could affect the properties or performance of the parts.4.4.3 Control factors shall include, but not be limited to, the following:Precleaning procedureBath composition l
27、imitsBath temperature limitsBath pH limitsMethod used for adhesion tests Periodic test plan.TABLE 1 - Sampling for Acceptance TestsNumber of Parts in Lot Quality AdhesionUp to 7 All 38 to 15 2 416 to 40 10 441 to 110 15 5111 to 300 25 6301 to 500 35 7Over 500 50 8Copyright SAE International Provided
28、 by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 2409G SAE AMS 2409G- 5 -4.5 Reports:Processor of plated parts shall furnish with each shipment a report stating that the parts have been processed and tested in accordance with the sp
29、ecified requirements and that they conform to the other technical requirements. This report shall include the purchase order number, lot number, AMS 2409G, part number, and quantity.4.6 Resampling and Retesting: 4.6.1 If the results of any acceptance test fails to meet specified requirements, the pa
30、rts represented may be stripped by a method acceptable to the purchaser that does not roughen, pit, or adversely affect part dimensions, pretreated, coated, supplementary treated, if specified, as defined herein, and tested. Alternatively, all parts in the lot may be inspected for the nonconforming
31、attribute, and the nonconforming parts may be stripped by a method acceptable to purchaser that does not roughen, pit, or adversely affect part dimensions and treated as above.4.6.2 If the results of any periodic test fail to meet the specified requirements, the process is nonconforming. No addition
32、al part shall be coated until the process is corrected and new specimens are coated and tested. Results of all tests shall be recorded and, when requested, reported. Purchaser shall be notified of all parts coated since the last acceptable test.5. PREPARATION FOR DELIVERY: 5.1 Packaging and Identifi
33、cation: 5.1.1 Plated parts shall be handled and packaged to ensure that the required physical characteristics and properties of the plating are preserved.5.1.2 Packages of plated parts shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and r
34、egulations pertaining to the handling, packaging, and transportation of the parts to ensure carrier acceptance and safe delivery.6. ACKNOWLEDGMENT:Processor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONS:Parts on
35、 which the plating does not conform to this specification, or to modifications authorized by purchaser, will be subject to rejection.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AMS 2409G SAE AMS
36、2409G- 6 -8. NOTES:8.1 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 specification.An (R) symbol to the left of the document title indicates a complete
37、revision of the specification, including technical revisions. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only.8.2 The parts manufacturer should ensure that surfaces of metal parts supplied to the processor are free from blemishes,
38、pits, tool marks, and other irregularities that will affect the quality of the finished parts. Defects and variations in appearance that arise from surface conditions of the substrate, such as porosity, scratches, or inclusions, that persist in the finished plate despite observance of industry accep
39、ted plating practices should not be considered as cause for rejection.8.3 Part manufacturing operations such as heat treatment, forming, machining, joining, and media finishing, can affect the condition of the substrate for plating, or if performed after plating, could adversely affect the plating.
40、The sequencing of these operations should be specified by the cognizant engineering organization and is not controlled by this specification.8.4 ARP4992, Periodic Test Plan for Process Solutions, may be used to satisfy the requirements for control of processing solutions.8.5 Dimensions in inch/pound
41、 units and the Fahrenheit temperatures are primary; dimensions in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are presented only for information.8.6 Purchase documents should specify not less than the following:AMS 2409GPart number of parts to be coatedQuantity of parts to be coated.PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “B“Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
