SAE AMS 2482D-2010 Hard Anodic Coating on Aluminum Alloys Polytetrafluoroethylene (PTFE)-Impregnated or Codeposited《浸渍或沉积的铝合金聚四氟乙烯(PTFE)硬质阳极涂层》.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 2010 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.orgSAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS2482DAEROSPACEMATERIALSPECIFICATIONAMS2482 REV. D Issued 1989-04 Reaffirmed 2006-04 Revised 201

5、0-01 Superseding AMS2482C Hard Anodic Coating on Aluminum Alloys Polytetrafluoroethylene (PTFE)-Impregnated or Codeposited RATIONALEAMS2482D results from a Five Year Review and update of this specification. 1. SCOPE 1.1 Form This specification establishes the requirements for a hard aluminum oxide c

6、oating, impregnated or codeposited with polytetrafluoroethylene (PTFE) on aluminum alloys. 1.2 Application This process has been used typically to increase, by the formation of a dense, PTFE-impregnated aluminum oxide or codeposited PTFE-aluminum oxide layer, surface hardness and resistance to abras

7、ion and corrosion of aluminum alloy parts containing, in general, less than 5% copper or 8% silicon or a total of 8% of both. See 8.6.1.3 Classification The processes covered by this specification are classified as follows: Type 1 - PTFE-impregnated aluminum oxide Type 2 - Codeposited PTFE and alumi

8、num oxide 1.3.1 If a specific type is not specified, Type 1 shall be supplied. 1.4 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

9、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 involved. 2. APPLICABLE DOCUMENTS The issue

10、 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 referenced document has been cancelled and n

11、o superseding document has been specified, the last published issue of that document shall apply. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2482D Page 2 of 72.1 ASTM Publications Availab

12、le from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org.ASTM B 117 Operating Salt Spray (Fog) Testing Apparatus ASTM B 244 Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmag

13、netic Basis Metals with Eddy-Current Instruments ASTM B 487 Measurement of Metal and Oxide Coating Thicknesses by Microscopical Examination of a Cross Section ASTM D 1193 Reagent Water ASTM D 1894 Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting ASTM D 4060 Abrasion Resistanc

14、e of Organic Coatings by the Taber Abraser 3. TECHNICAL REQUIREMENTS 3.1 Preparation 3.1.1 The coating shall be applied to a surface free from water breaks. The cleaning procedure shall not produce pitting or intergranular attack of the basis metal and shall preserve dimensional requirements.3.1.2 T

15、ight electrical contact shall be maintained during the anodic treatment to prevent contact arcing (burning) of parts, but small irregularities of coating at points of electrical contact are acceptable. When not otherwise specified by the purchaser, the location of electrical contact points shall be

16、as follows. For parts which are to be coated all over, locations shall be acceptable to purchaser. For parts which are not to be coated all over, locations shall be in areas on which coating is not required. 3.1.3 A suitable maskant shall be applied to any area or areas where anodize is not permitte

17、d, solution entrapment may occur such as faying surfaces, or where there is another metal such as a thread insert. 3.2 Procedure An anodic potential shall be impressed on the parts while immersed in a suitable electrolyte to induce formation of aluminum oxide, codeposited or impregnated with PTFE. A

18、fter coating, parts shall be thoroughly rinsed in cold, clean water and dried. 3.3 Properties Coating on parts shall conform to the following requirements: 3.3.1 Thickness AMS2482 designates finished coating thickness of 0.002 inch 0.0005 (51 m 13). Other coating thicknesses may be specified by this

19、 specification number and a suffix number designating the nominal thickness in thousandths of an inch (25 m). A tolerance of 0.0005 inch (13 m) in thickness of coating will be allowed. Thus, AMS2482-3 designates a finished coating thickness of 0.003 inch 0.0005 (76 m 13). 3.3.1.1 Thickness of coatin

20、g shall be as specified on the drawing determined in accordance with any of the following methods as applicable: microscopic method, micrometer measurement, eddy-current method in accordance with ASTM B 244 or ASTM B 487, or other method acceptable to the cognizant engineering organization. See 4.3.

21、3.2.3.3.1.2 Coating thickness requirements shall not apply to blind holes or recesses with depth greater than twice the diameter or in open holes with depth greater than seven times the diameter unless a specific coating thickness is specified in those areas. Copyright SAE International Provided by

22、IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2482D Page 3 of 73.3.2 Corrosion Resistance The coated specimens (4.3.3.3) shall meet the following requirements determined after exposure for not less than 336 hours to salt spray tes

23、t in accordance with ASTM B 117, except that the significant surface shall be inclined approximately 6 degrees from vertical. The five test panels shall show not more than a total of 15 isolated pits, none larger than 1/32 inch (0.8 mm) in diameter, in a total of 150 sq inches (968 cm2) of test area

24、 Individual test specimens, after salt-spray testing, shall show no more than five isolated pits, none larger then 1/32 inch (0.8 mm) in diameter, in a total of 30 square inches (194 cm2) of test area. See 8.2.1. Areas within 1/16 inch (1.6 mm) of identification markings and electrical contact marks

25、 shall not be included. 3.3.3 Abrasion Resistance The coated specimens (4.3.3.4) shall have a maximum wear index of 4.0 mg/1000 cycles on aluminum alloys having a nominal copper content of two percent or higher and a maximum wear index of 2.0 mg/1000 cycles for all other alloys, determined as follow

26、s: two test specimens weighed to the nearest milligram shall be tested in accordance with ASTM D 4060, using CS-17 wheels with a 1000-gram load for 10 000 cycles. After abrading, the specimens shall be weighed to the nearest milligram to determine weight loss. The wear index is determined at the end

27、 of 10 000 cycles by dividing the weight loss by ten. Specimens may be placed in a desiccator prior to and following testing to establish constant weight in lieu of conditioning specified in ASTM D 4060. The abrasive wheels shall be resurfaced prior to the start of any individual test, and at least

28、once every 10 000 cycles.3.3.4 Coefficient of Friction The coated specimens (4.3.3.5) tested in accordance with ASTM D 1894 or other method acceptable to the cognizant engineering organization shall have a maximum coefficient of friction of 0.15. 3.4 Quality Coating, as received by purchaser, shall

29、be smooth, uniform in appearance, and free from scratches, chips, and burned areas. Small irregularities at points of electrical contact are permitted. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The coating processor shall supply all samples for processors tests shall be respo

30、nsible for performance of all required tests. When parts are to be tested, such parts shall be supplied by purchaser. The cognizant engineering organization reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coating conforms to the specified requ

31、irements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Thickness (3.3.1) and quality (3.4) are acceptance tests and shall be performed on parts, or specimens representing parts when permitted herein, from each lot. See 4.3.3. 4.2.2 Periodic Tests Corrosion resistance (3.3.2) and abrasion resis

32、tance (3.3.3) are periodic tests and shall be performed at least monthly unless frequency of testing is specified by the cognizant engineering organization. Coefficient of friction (3.3.4) is a periodic test and shall be performed at least semi-annually unless frequency of testing is specified by th

33、e cognizant engineering organization. Tests of cleaning and processing solutions are periodic tests and shall be performed at a frequency established by the processor unless frequency of testing is specified by the cognizant engineering organization. See 8.5 and 4.4.3. Copyright SAE International Pr

34、ovided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2482D Page 4 of 74.2.3 Preproduction Tests All property verification tests (section 3.4) are preproduction tests and shall be performed prior to or on the initial shipmentof

35、coated parts to a purchaser and when the cognizant engineering organization requires confirmatory testing. 4.3 Sampling for Testing 4.3.1 Acceptance Tests Acceptance test samples shall be randomly selected from all parts in the lot. A lot shall be all parts of the same part number, processed in a co

36、ntinuous series of operations in not longer than 24 consecutive hours, and presented for processors inspection at one time. Unless the cognizant engineering organization provides a sampling plan, the minimum number of samples shall be as shown in Table 1. TABLE 1 - MINIMUM SAMPLING FOR ACCEPTANCE TE

37、STS Number of Parts in Lot Quality Thickness Up to 7 All 3 or all* 8 to 15 7 4 16 to 40 10 4 41 to 110 15 5 111 to 300 25 6 301 to 500 35 7 Over 500 50 8 *Whichever is less 4.3.2 Periodic Tests Sample quantities shall be five for corrosion resistance (3.3.2) and two each for abrasion resistance (3.3

38、.3) and coefficient of friction (3.3.4) unless otherwise specified by the cognizant engineering organization. 4.3.2.1 If test panels of an alloy different from that of the parts they represent are used, panels shall be processed under conditions, previously established, which will produce the same c

39、oating thickness as that on the parts they represent. 4.3.3 Sample Configuration 4.3.3.1 Separate test specimens may be used under any one of the following circumstances: The parts are of such configuration or size as to be not readily adaptable to specified tests, nondestructive testing is not prac

40、tical on actual parts, or it is not economically acceptable to perform destructive tests on actual parts. Except as specified below, acceptance test specimens shall be made of the same alloy as the parts represented andperiodic test specimens shall be fabricated from the predominant alloy anodized s

41、ince the last periodic test. Acceptance test specimens shall be distributed within the lot, cleaned, and processed with the parts. Wheneverpossible, specimens shall be processed with an actual production lot. 4.3.3.2 Thickness When micrometer measurement (3.3.1.1) is used, specimens for thickness de

42、termination shall be of the same alloy as the parts they represent and shall be processed with the parts represented. The specimens shall be 0.04 x 2 x 4 inches (1.0 x 51 x 102 mm) or of suitable configuration to provide an accurate measurement. Micrometer measurements shall be validated against mic

43、roscopic measurements on specimens processed to the same nominal coating thickness. 4.3.3.3 Corrosion resistance (3.3.2) test panels shall be 0.025 to 0.063 inch (0.64 to 1.60 mm) thick and not less than 3 x 10 inches (76 x 254 mm) in width and length fabricated from AMS4037 (2024-T3).Copyright SAE

44、International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2482D Page 5 of 74.3.3.4 Abrasion resistance test (3.3.3) specimens shall be either 4-inch (102-mm) diameter round or 4 inches (102 mm) square panel fabricate

45、d from AMS4037 (2024-T3), aluminum alloy sheet, or the predominant alloy (as defined above) anodized measuring not less than 0.063 inch (1.60 mm) thick with a 0.250-inch (6.35-mm) diameter hole in the center and shall not have been given a supplementary sealing treatment. 4.3.3.5 Coefficient of fric

46、tion (3.3.4) test specimens shall be either 0.04 x 5 x 10 inches (1.0 x 127 x 254 mm) or other suitable configuration to ensure accurate measurement fabricated from AMS4037 (2024-T3) aluminum alloy sheet or the predominant alloy being processed. Testing shall be in accordance with ASTM D 1894 or oth

47、er method acceptable to the cognizant engineering organization. Maximum coefficient of friction shall be 0.15. 4.4 Approval 4.4.1 Sample coated parts and/or the coating and control procedure used to coat parts shall be approved by the cognizant engineering organization before coated parts for use ar

48、e supplied. When sample coated parts are required, coatings on production parts shall be equivalent to those on the approved sample parts. 4.4.2 If the processor shall makes a significant change to any material, process, or control factor from those on which 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, would affect the properties or performance of the part. 4.4.3 Control factors shall include, but not be limited to, the following: Surface p