SAE AMS 2482E-2017 Hard Anodic Coating on Aluminum Alloys Polytetrafluoroethylene (PTFE)-Impregnated or Codeposited.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 ther

2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this

3、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: +1 724-776-49

4、70 (outside USA) 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:/standards.sae.org/AMS2482E AEROSPACE MATERIAL SPECIFICATION AMS2482 REV. E Issued 1989-04 Revised 2017-07 Supers

5、eding AMS2482D Hard Anodic Coating on Aluminum Alloys Polytetrafluoroethylene (PTFE)-Impregnated or Codeposited RATIONALE AMS2482E results from a Five-Year Review and update of this specification with technical changes made to Quality (3.4) and Tolerances (3.5). ORDERING INFORMATION: The following i

6、nformation shall be provided to the processor by the purchaser 1. Purchase Order shall specify not less than the following: AMS2482E Basis metal to be anodized Special features, geometry or processing present on parts that requires special attention by the processor Quantity of pieces to be anodized

7、 2. Parts manufacturing operations such as heat treating, forming, joining, and media finishing can affect the condition of the substrate and adversely affect the finished part. The sequencing of these types of operations should be specified by the cognizant engineering organizatio or purchaser and

8、is not controlled by this specification. 1. SCOPE 1.1 Form This specification establishes the requirements for a hard aluminum oxide coating, impregnated or codeposited with polytetrafluoroethylene (PTFE) on aluminum alloys. 1.2 Application This process has been used typically to increase, by the fo

9、rmation of a dense, PTFE-impregnated aluminum oxide or codeposited PTFE-aluminum oxide layer, surface hardness and resistance to abrasion 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. SAE INTERNATIONAL AMS2482E Page

10、 2 of 8 1.3 Classification The processes covered by this specification are classified as follows: Type 1 - PTFE-impregnated aluminum oxide Type 2 - Codeposited PTFE and aluminum oxide 1.3.1 If a specific type is not specified, Type 1 shall be supplied. 1.4 Safety - Hazardous Materials While the mate

11、rials, methods, applications, and processes described or referenced in this specification may involve the use of 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 p

12、roper 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 the following documents in effect on the date of the purchase order forms a part of this specification to the extent speci

13、fied 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 superseding document has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Availab

14、le from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS4037 Aluminum Alloy, Sheet and Plate, 4.4Cu - 1.5Mg - 0.60Mn (2025; -T3 Flat Sheet, -T351 Plate), Solution Heat Treated 2.2 ASTM P

15、ublications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B117 Operating Salt Spray (Fog) Apparatus ASTM B244 Measurement of Thickness of Anodic Coatings on Aluminum and of Other Nonconductive Coatings

16、 on Nonmagnetic Basis Metals with Eddy-Current Instruments ASTM B487 Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of a Cross Section ASTM D1894 Static and Kinetic Coefficients of Friction of Plastic Film and Sheeting ASTM D4060 Abrasion Resistance of Organic Coatings

17、 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. SAE INTERNATIONAL AMS2482E

18、Page 3 of 8 3.1.2 Tight 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 conta

19、ct points shall be 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 anod

20、ize is not permitted, 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 impre

21、gnated with PTFE. After 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 b

22、e specified by this 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

23、Thickness of coating 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 B244 or ASTM B487, or other method acceptable to the cognizant engineering organ

24、ization. See 4.3.3.2. 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. 3.3.2 Corrosion Resist

25、ance The coated specimens (4.3.3.3) shall meet the following requirements determined after exposure for not less than 336 hours to salt spray test in accordance with ASTM B117, except that the significant surface shall be inclined approximately 6 degrees from vertical. The five test panels shall sho

26、w 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. 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 tot

27、al 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 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 h

28、aving 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 follows: two test specimens weighed to the nearest milligram shall be tested in accordance with ASTM D4060, using CS-17 wheels with a 1000-gram load for 10 000 c

29、ycles. After abrading, the specimens shall be weighed to the nearest milligram to determine weight loss. The wear index is determined at the end 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

30、 lieu of conditioning specified in ASTM D4060. The abrasive wheels shall be resurfaced prior to the start of any individual test, and at least once every 10 000 cycles. SAE INTERNATIONAL AMS2482E Page 4 of 8 3.3.4 Coefficient of Friction The coated specimens (4.3.3.5) tested in accordance with ASTM

31、D1894 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 be smooth, uniform in appearance, and free from scratches, chips, and burned areas. Small irregularities at points of

32、electrical contact are permitted. Differences in the anodic coating appearance on castings or wrought components due to welds, or cast vs. machined surface textures or macro grain size or other inherent metallurgical artifacts shall not be cause for rejection of the anodic coating. See 8.9. 3.5 Tole

33、rances When a limited are to be gard coated is specified, a tolerance of -0, +1/16 inch (+1.6mm) will be permitted on the extent of the hard coated area execpt when such area ends at a corner; in such cases, the area shall not extend beyond the corner by more than the projected thicknss of the coati

34、ng. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The coating processor shall supply all samples for processors tests shall be responsible for performance of all required tests. When parts are to be tested, such parts shall be supplied by purchaser. The cognizant engineering orga

35、nization reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coating conforms to the specified requirements. 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 part

36、s, 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 resistance (3.3.3) are periodic tests and shall be performed at least monthly unless frequency of testing is specified by the cognizant engineering organ

37、ization. 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 the cognizant engineering organization. Tests of cleaning and processing solutions are periodic tests and shall be performed at a frequency establishe

38、d by the processor unless frequency of testing is specified by the cognizant engineering organization. See 8.5 and 4.4.3. 4.2.3 Preproduction Tests All property verification tests (section 3.3) are preproduction tests and shall be performed prior to or on the initial shipment of coated parts to a pu

39、rchaser and when the cognizant engineering organization requires confirmatory testing. SAE INTERNATIONAL AMS2482E Page 5 of 8 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

40、, processed in a continuous 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 Samplin

41、g for Acceptance Tests 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 abras

42、ion resistance (3.3.3) 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

43、 produce the same coating 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

44、testing is not practical 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 and periodic test specimens shall be fabricated from the predomin

45、ant alloy anodized since the last periodic test. Acceptance test specimens shall be distributed within the lot, cleaned, and processed with the parts. Whenever possible, specimens shall be processed with an actual production lot. 4.3.3.2 Thickness When micrometer measurement (3.3.1.1) is used, speci

46、mens for thickness determination 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

47、validated against microscopic 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 (20

48、24-T3). 4.3.3.4 Abrasion resistance test (3.3.3) specimens shall be either 4-inch (102-mm) diameter round or 4 inches (102 mm) square panel fabricated 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

49、 with a 0.250 inch (6.35 mm) diameter hole in the center and shall not have been given a supplementary sealing treatment. SAE INTERNATIONAL AMS2482E Page 6 of 8 4.3.3.5 Coefficient of friction (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 al