《SAE-AMS-2485J-2002.pdf》由会员分享，可在线阅读，更多相关《SAE-AMS-2485J-2002.pdf（6页珍藏版）》请在三一文库上搜索。
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 therefr
2、om, 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 2002 Society of Automotive Engineers, Inc. All rights reserved. No part of
3、this publication 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: 724-776-4
4、970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS:http:/www.sae.org AEROSPACE MATERIAL SPECIFICATION AMS 2485J IssuedMAY 1948 RevisedOCT 2002 Superseded by AMS 2485H Coating, Black Oxide 1. SCOPE: 1.1 Purpose: This specification covers the engineering requirements for produci
5、ng black oxide coatings on parts and the properties of such coatings. 1.2 Application: This coating has been used typically to improve the anti-chafing and anti-friction properties of carbon and low-alloy steel parts, particularly for sliding or bearing surfaces, by providing a finish coating which
6、will retain an oil film, 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, this specification does not address the hazard
7、s 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 involved. 2. APPLICABLE DOCUMENTS: The issue of t
8、he 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 referenced document has been cancelled and no sup
9、erseding document has been specified, the last published issue of that document shall apply. -,-,- AMS 2485JSAEAMS 2485J - 2 - 2.1 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or http:/www.astm.org. ASTM G 46 Examination and Evaluation of Pitting Co
10、rrosion 3. TECHNICAL REQUIREMENTS: 3.1 Preparation: 3.1.1The parts to be coated shall have clean surfaces, free from water-breaks. 3.2 Procedure: 3.2.1The cleaned parts, while still wet, shall be immersed in one or more boiling aqueous alkali oxidizing baths for times and at temperatures (See 8.3) w
11、hich will produce coatings meeting the requirements of 3.3 and 3.4. 3.2.2Coated parts shall be washed thoroughly in running tap water to remove all traces of processing solution and salts. Parts shall not be allowed to dry during the entire sequence of operations until completion of this rinse. 3.2.
12、3Parts shall be thoroughly dried unless a water-displacing oil is used in 3.2.4, in which case complete drying may be omitted. 3.2.4Parts shall be dipped in a suitable corrosion-preventive oil. 3.3 Properties: Coated parts shall conform to the following requirements: 3.3.1 Smut Test: Coatings on par
13、ts before oiling as in 3.2.4, or on oiled parts after degreasing, shall show no indications of reddish-brown or green smut when wiped with a clean, white cloth. 3.3.2 Dimensional Change: When determined using a micrometer accurate to 0.0001 inch (2.5 mm), no dimensional change shall result from proc
14、essing. 3.3.3 Oxalic Acid Spot Test: The coating, prior to application of corrosion preventative oil, shall be tested as follows. Clean, dry coated parts or specimens of the same composition and heat treat condition as the parts and processed with the parts represented shall be handled with clean co
15、tton gloves. Each sample shall have deposited three drops of a 5% solution of oxalic acid on a flat surface. Permit the accompanying reaction to continue for eight minutes, followed by rinsing in cool water and drying. When examined, the area which was directly under the acid test solution drops sha
16、ll exhibit a black or dark brown center with a light border. Areas under the drop, which exhibit a gray center and lighter border are marginal coatings and are not acceptable. AMS 2485JSAEAMS 2485J - 3 - 3.3.4 Surface and Intergranular Attack: The cleaning and coating process shall not result in any
17、 surface pitting, as determined by ASTM G 46, or in intergranular attack, determined on metallographically prepared cross-sections examined unetched at 400X magnification. 3.4 Quality: Except as otherwise specified herein, the coating on polished surfaces shall be a uniformly lustrous black. Coating
18、 on other surfaces shall be black or dark gray in color, uniform on areas of equivalent surface roughness. Coating on all types of surfaces shall be free of spots of red oxide or an overall reddish-brown color but an overall reddish-brown cast on a basically black color is permissible. Coating shall
19、 be continuous, smooth, dense, and adherent and shall not rub off under any conditions incident to normal handling or storage. 4. QUALITY ASSURANCE PPOVISIONS: 4.1 Responsibility for Inspection: The processor of coated parts shall supply all samples for processors tests and shall be responsible for
20、performance of all required tests. Parts if required for tests shall be supplied by purchaser. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that processing conforms to the requirements of this specification. 4.2 Classification of Tests: 4.
21、2.1 Acceptance Tests: Smut test (3.3.1), oxalic acid spot test (3.3.3), and quality (3.4) are acceptance tests and shall be performed on each lot. 4.2.2 Periodic Tests: Surface and Intergranular attack (3.3.4) when parts 36 HRC or higher are being processed, and tests of cleaning and coating baths (
22、See 8.2) to ensure that coatings will conform to specified requirements are periodic tests and shall be performed at a frequency selected by the processor unless frequency is specified by the purchaser. 4.2.3All technical requirements are preproduction tests and shall be performed prior to or on the
23、 initial shipment of coated parts to a purchaser, on each lot, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. 4.3 Sampling and Testing: Shall be not less than the following; a lot shall be all parts made o
24、f the same material, heat treated to the same hardness or tensile strength level, processed in the same solution(s) in not longer than eight consecutive hours, and presented for processors inspection at one time. Parts for tests shall be selected randomly from all parts in the lot. -,-,- AMS 2485JSA
25、EAMS 2485J - 4 - 4.3.1 For Acceptance Tests: Shall be as shown in Table 1. 4.3.1.1 Periodic Tests: Sample quantity shall be selected at the discretion of the processor unless otherwise specified. 4.3.2When coated parts are of such configuration or size as to not be readily adaptable to specified tes
26、ts or when nondestructive testing is not practical on actual parts, or when it is not economically acceptable to perform destructive tests on actual parts, separate specimens of the same class of alloy and heat treat condition as the parts represented, cleaned and coated with the parts represents ma
27、y be used. 4.4 Approval: 4.4.1The process and control factors, a preproduction part, or both, whichever is specified, shall be approved by the cognizant engineering organization before production parts are supplied. 4.4.2The processor shall make no significant change to materials, processes or contr
28、ol factors from those on which the approval was based, unless the change is approved by the cognizant engineering organization. A significant change is one which in the judgment of the cognizant engineering organization could affect the properties or performance of the parts. 4.4.3Controls factors s
29、hall include, but not be limited to the following: Cleaning method Type of blackening bath used Corrosion preventive oil used Periodic test plan. 4.5 Reports: The processor of coated parts shall furnish with each shipment a report stating that the parts have been processed and tested in accordance w
30、ith the specified requirements and that they conform to the acceptance test requirements. This report shall include the purchase order number, lot number, AMS 2485J, part number, and quantity. Table 1Sampling for Acceptance Tests Lot SizeQualitySmut TestOxalic Acid Spot Test Up to 7All31 7 to 15741
31、16 to 401041 41 to 1101552 111 to 3002563 301 to 5003574 Over 5005085 AMS 2485JSAEAMS 2485J - 5 - 4.6 Resampling and Retesting: 4.6.1If the results of any periodic test fails to meet specified test requirements, the parts in that lot may be stripped by a method acceptable to purchaser that does not
32、roughen, pit, adversely affect part dimensions, or embrittle the basis metal, pretreated, coated, post treated as defined herein, and tested. Alternatively, all parts in the lot may be inspected for the nonconforming attribute, and the nonconforming parts may be stripped by a method acceptable to pu
33、rchaser that does not roughen, pit, adversely affect part dimensions, or embrittle the basis metal, pretreated, coated, post treated as defined herein, and tested. 4.6.2If the results of any periodic test fail to meet specified test requirements, the process is nonconforming. No additional parts sha
34、ll be coated until the process is corrected and new specimens are plated and tested. Results of all tests shall be recorded and, when requested, reported. Purchaser shall be notified of all parts plated since the last acceptable test. 5. PREPARATION FOR DELIVERY: 5.1Coated parts shall be handled and
35、 packaged to ensure that the required properties of the coating are preserved. 5.2Packages of coated parts shall be prepared for shipment in accordance with commercial practice and in compliance with applicable rules and regulations pertaining to the handling, packaging, and transportation of the pa
36、rts 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: Coated parts on which the coating does not conform to this specification, or to mo
37、difications authorized by purchaser, will be subject to rejection. 8. NOTES: 8.1A change bar (|) 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 a specification. An (R) symbol to
38、 the left of the document title indicates a complete revision of the specification. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2ARP4992, Periodic Test Plan for Process Solutions, is recommended to satisfy requirements for c
39、ontrol of processing solutions. -,-,- AMS 2485JSAEAMS 2485J - 6 - 8.3No specific composition is given for the black oxide processing bath. The intensity of the black color is dependent on the time of immersion, the temperature of the bath, and the concentrations of the bath ingredients. Typical blac
40、k oxide baths consist of sodium hydroxide with additions of oxidizers and inhibitors, the composition being adjusted to maintain a selected boiling temperature in the range of 250 to 310 F (121 to 154 C). Immersion times range from 5 to 60 minutes. Composition is generally adjusted to maintain the s
41、elected boiling temperature. In some cases, a two tank treatment is used, each with different processing conditions, but each essentially as described above. 8.4The appearance of the coating is affected by the composition, condition, and surface finish of the basis material. 8.5 Precaution: Assembli
42、es containing parts made of metals other than steel or iron alloys should not be processed unless surfaces of such parts are masked or unless solutions contain agents which prevent deterioration of the solution(s) and allowance is made, where necessary, for removal of attacked areas. 8.6Purchase documents should specify not less than the following: AMS 2485J Quantity of pieces to be coated Basis material of parts Hardness of parts to be coated. 8.7Key Words: Anti-chafing, anti-friction, bearing surface, oil film PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE “B“. -,-,-