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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 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. All rights reserved.Printed in U.S.A. QUESTIONS REGARDING THIS DOCUMENT:(724) 772-716
3、1FAX: (724) 776-0243 TO PLACE A DOCUMENT ORDER:(724) 776-4970FAX: (724) 776-0790 SAE WEB ADDRESS:http:/www.sae.org 400 Commonwealth Drive, Warrendale, PA 15096-0001 AEROSPACE MATERIAL SPECIFICATION AMS 2482C IssuedAPR 1989 RevisedAUG 2000 Superseding AMS 2482B Hard Coating Treatment of Aluminum Allo
4、ys Teflon-Impregnated or Codeposited 1.SCOPE: 1.1Form: This specification establishes the engineering requirements for producing a hard, teflon-impregnated or codeposited teflon-aluminum oxide coating on aluminum alloys and the properties of such coating. 1.2Application: This process has been used t
5、ypically to increase, by the formation of a dense, teflon-impregnated aluminum oxide or codeposited teflon-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. Alloy
6、s with higher silicon content alone can be coated satisfactorily with proper precautions in processing. Careful consideration should be given to the use of this process on highly-stressed parts because of the resultant marked lowering of fatigue performance, and on parts with sharp corners and edges
7、 where chipping may result. 1.3Classification: The processes covered by this specification are classified as follows: Type 1 - Teflon-impregnated aluminum oxide Type 2 - Codeposited teflon and aluminum oxide 1.3.1If a specific type is not specified, type 1 shall be supplied. 1.4Safety - Hazardous Ma
8、terials: 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 hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiar
9、ity 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. Copyright 2006 SAE International Reaffirmed APR 2006 AMS 2482CSAEAMS 2482C - 2 - 2.APPLICABLE DOCUMENTS: The issue of the following docu
10、ments 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 superseding document
11、 has been specified, the last published issue of that document shall apply. 2.1ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. ASTM B 117Operating Salt Spray (Fog) Testing Apparatus ASTM B 244Measurement of Thickness of Anodic Coatings on Aluminum and
12、 of Other Nonconductive Coatings on Nonmagnetic Basis Metals with Eddy-Current Instruments ASTM B 487Measurement of Metal and Oxide Coating Thicknesses by Microscopical Examination of a Cross Section ASTM D 1193Reagent Water ASTM D 1894Static and Kinetic Coefficients of Friction of Plastic Film and
13、Sheeting ASTM D 4060Abrasion Resistance of Organic Coatings by the Taber Abraser 3.TECHNICAL REQUIREMENTS: 3.1Preparation: 3.1.1Parts, prior to being coated, shall have clean surfaces, free from water-breaks. 3.1.2When not otherwise specified by the purchaser, the location of electrical contact poin
14、ts shall be as follows (not applicable to barrel coating). 3.1.2.1For parts which are to be coated all over, locations shall be acceptable to purchaser. 3.1.2.2For parts which are not to be coated all over, locations shall be in areas on which plating is not required or is optional. 3.2Procedure: Co
15、nsists of the formation of aluminum oxide, codeposited or impregnated with teflon, on surfaces of parts made the anode in a suitable electrolyte. After coating, parts shall be thoroughly rinsed in cold, clean water and dried. AMS 2482CSAEAMS 2482C - 3 - 3.3Properties: Coating on parts shall conform
16、to the following requirements: 3.3.1Thickness: AMS 2482 designates finished coating thickness of 0.002 inch 0.0005 (51 m 13). Other coating thicknesses may be specified by this specification number and a suffix number designating the nominal thickness in thousandths of an inch (25 m). A tolerance of
17、 0.0005 inch (13 m) in thickness of coating will be allowed. Thus, AMS 2482-3 designates a finished coating thickness of 0.003 inch 0.0005 (76 m 13). 3.3.1.1Thickness of coating shall be determined on representative parts or specimens by microscopic method, micrometer measurement, eddy-current metho
18、d in accordance with ASTM B 244 or ASTM B 487, or other method acceptable to purchaser. When micrometer measurement is used, specimens 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
19、 x 4 inches (1.0 x 51 x 102 mm) or of suitable configuration to provide an accurate measurement. Micrometer measurements shall be calibrated against microscopic measurements on specimens processed to the same nominal coating thickness. 3.3.1.2Coating thickness requirements shall not apply to blind h
20、oles 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. 3.3.2Corrosion Resistance: The coated specimens, 0.04 x 3 x 10 inches (1.0 x 76 x 254 mm), fabricated from an
21、 alloy generically similar to the parts represented shall be washed in ASTM D 1193, Type IV, water, dried, and then subjected to a 5% salt spray test for 336 hours in accordance with ASTM B 117, except that the significant surface shall be inclined approximately 6 degrees from vertical. The coated s
22、pecimens, after salt-spray testing, shall show no more than five isolated spots or pits, none larger then 1/32 inch (0.8 mm) in diameter, in a total of 30 square inches (194 cm2) of test area. Areas are excepted if they are within 1/16 inch (1.6 mm) of identification markings and electrical contact
23、marks that remain after processing. 3.3.3Abrasion Resistance: Test specimens, 0.04 x 4 x 4 inches (1.0 x 102 x 102 mm), fabricated from AMS 4037 aluminum alloy sheet or the predominant alloy being processed when the periodic test specimen is selected, shall be tested in accordance with ASTM D 4060,
24、using CS17 wheels with a 1000-gram load. The wheels shall revolve on the coating at a speed of 70 revolutions per minute for 10,000 cycles. After abrading, the specimens shall be weighed to the nearest milligram to determine weight loss. Maximum weight loss shall be 40 milligrams for aluminum alloy
25、2024 and 20 milligrams for all other aluminum alloys. 3.3.4Coefficient of Friction: Coated test specimens fabricated from AMS 4037 aluminum alloy sheet or the predominant alloy being processed when the periodic test specimen is selected, 0.04 x 5 x 10 inches (1.0 x 127 x 254 mm) or other suitable co
26、nfiguration to ensure accurate measurement, shall be tested in accordance with ASTM D 1894 or other method acceptable to purchaser. Maximum coefficient of friction shall be 0.15. -,-,- AMS 2482CSAEAMS 2482C - 4 - 3.4Quality: Coating, as received by purchaser, shall be smooth, uniform in appearance,
27、and free from scratches, chips, and burned areas. Small irregularities at points of electrical contact are permitted. 4.QUALITY ASSURANCE PROVISIONS: 4.1Responsibility for Inspection: The coating processor shall supply all samples for processors tests shall be responsible for performance of all requ
28、ired tests. When parts are to be tested, such parts shall be supplied by purchaser. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coating conforms to the requirements of this specification. 4.2Classification of Tests: 4.2.1Acceptan
29、ce Tests: Thickness (3.3.1) and quality (3.4) are acceptance tests and shall be performed on each lot. 4.2.2Periodic Tests: Corrosion resistance (3.3.2), abrasion resistance (3.3.3), and coefficient of friction (3.3.4) are periodic tests and shall be performed at a frequency selected by the processo
30、r unless frequency of testing is specified by purchaser. 4.2.3Preproduction Tests: All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of coated parts to a purchaser, when a change in material and/or processing requires reapproval as in 4.4.2
31、, and when purchaser deems confirmatory testing to be required. 4.3Sampling: Shall be as follows; a lot shall be all coated parts made from the same alloy, processed to the same coating thickness, and presented for processors inspection at one time. 4.3.1For Acceptance Tests: The number of parts sam
32、pled shall not be less than shown in Table 1. AMS 2482CSAEAMS 2482C - 5 - 4.3.2For Periodic Tests: Frequency of sampling shall be at the discretion of the processor unless otherwise specified by purchaser. 4.3.2.1If test panels of an alloy different from that of the parts they represent are used, pa
33、nels shall be processed under conditions, previously established, which will produce the same coating thickness as that on the parts they represent. 4.4Approval: 4.4.1Sample coated parts and/or the coating and control procedure used to coat parts shall be approved by purchaser before coated parts fo
34、r use are supplied. When sample coated parts are required, coatings on production parts shall be equivalent to those on the approved sample parts. 4.4.2The processor shall make no significant change to materials, processes, or control factors from those on which approval was based, unless the change
35、 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. 4.4.3Control factors shall include, but not be limited to, the following: Surface preparation
36、methods Composition limits and temperature limits of anodizing bath PTFE, how applied for Type 1 coating Frequency of test of anodizing bath composition Method for determining coating thickness, and, if micrometer measurements are used, correlation between measurement and actual thickness Anodizing
37、voltage limits, and voltage ramp rates where voltage is not constant Periodic test plan TABLE 1 - Minimum Sampling for Acceptance Tests Number of Parts in LotQualityThickness Up to 7All3 8 to 15 74 16 to 40104 41 to 110155 111 to 300256 301 to 500357 Over 500508 -,-,- AMS 2482CSAEAMS 2482C - 6 - 4.5
38、Reports: The processor of coated parts shall furnish with each shipment a report stating that the parts have been processed and tested in accordance with specified requirements of this specification and that the parts conform to the acceptance test requirements. This report shall include the purchas
39、e order number, lot number, AMS 2482C, part number, and quantity. 4.6Resampling and Retesting: 4.6.1If results of any acceptance test fails to meet specified requirements, the parts may be stripped with the approval of the cognizant engineering organization, by a method that does not roughen, pit, o
40、r adversely affect part dimension, pretreated, coated, and tested. Alternatively, all parts in the lot may be inspected for the nonconforming attribute, and the nonconforming parts may be stripped with the approval of the cognizant engineering organization, by a method that does not roughen, pit, or
41、 adversely affect part dimensions, pretreated, coated, and tested. 4.6.2If the results of any periodic test fail to meet the specified requirements, the process is nonconforming. No additional part shall be coated until the process is corrected and new specimens are coated and tested. Results of all
42、 tests shall be recorded and, when requested, reported. Purchaser shall be notified of all parts since the last acceptable test. 5.PREPARATION FOR DELIVERY: 5.1Coated parts shall be handled and packaged to ensure that the required physical characteristics and properties of the coating are preserved.
43、 5.2Packages of 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 coated parts to ensure carrier acceptance and safe delivery. 6.ACKNOWLEDGMENT: A proces
44、sor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7.REJECTIONS: Parts on which the coating does not conform to this specification, or to modifications authorized by purchaser, will be subject to rejection. -,-,- AMS 2482CSAE
45、AMS 2482C - 7 - 8.NOTES: 8.1A 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 com
46、plete 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. 8.2Precautions: 8.2.1Wire, hooks, racks, and clamps used to suspend parts in the electrolyte, if they also are in
47、contact with the electrolyte, should be made of aluminum, aluminum alloys, titanium, or titanium alloys. 8.2.2Aluminum parts containing inserts of other metal should have the inserts masked off before the parts are coated. 8.2.3In general, growth of parts will be approximately half the coating thick
48、ness, but this relationship will vary with basis material and coating thickness. 8.2.4Only parts made of the same alloy and, in the case of heat-treatable alloys, the same temper should be processed in a single batch. 8.2.5Coated surfaces may be honed or lapped as necessary to meet specified surface
49、 finish requirements, however honing or lapping will decrease coating thickness and may result in unacceptable changes in wear properties and coefficient of friction. 8.3All heat treatment, machining, forming, brazing, welding and perforating operations shall, insofar as practicable, be completed before parts are processed. 8.4Dimensions and properties in inch/pound units are primary; dimensions and properties in SI units are shown as the a