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 there
2、from, 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 2012 SAE International All rights reserved. No part of this publication m
3、ay 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: +1 724-776-4970 (outside U
4、SA) 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:/www.sae.org/technical/standards/AMS2515G AEROSPACE MATERIAL SPECIFICATION AMS2515 REV. G Issued 1961-01 Reaffirmed 2003-05 Re
5、vised 2013-01 Superseding AMS2515F Polytetrafluoroethylene (PTFE) Resin Coating Low Build, 370 to 400 C (698 to 752 F) Fusion RATIONALE Acceptance test requirements in Rev. F are not practical to perfom on every lot. Some acceptance test requirements changed to be required on every batch, instead of
6、 every lot. 1. SCOPE 1.1 Purpose This specification establishes the engineering requirements for producing thin coatings of polytetrafluoroethylene (PTFE) resin on parts and the properties of such coatings. 1.2 Application Primarily to provide dry lubrication, high heat stability, and corrosion prot
7、ection on parts which operate at not higher than 275 C (527 F) for limited periods or not higher than 245 C (473 F) for extended periods. This coating may also be used as a release film for molds. 1.2.1 This coating should not be specified for use on parts made of, or coated with, metals, such as ca
8、dmium, lead, tin, and zinc, having melting points below or only slightly above the fusing temperature of 3.4. 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 spec
9、ification 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 safety of all personnel involved. 2.
10、 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 specified. When the referenced do
11、cument has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE AMS2515G Page 2 of 6 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada
12、) or 724-776-4970 (outside USA), www.sae.org. AMS5045 Steel, Sheet and Strip, 0.25 Carbon, Maximum, Hard Temper 2.2 ASTM Publications 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 A 108 Steel Bars, Car
13、bon, Cold-Finished, Standard Quality ASTM B 117 Salt Spray (Fog) Testing 2.3 U.S. Government Publications Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/. MI
14、L-STD-202 Test Methods for Electronic and Electrical Component Parts 3. TECHNICAL REQUIREMENTS 3.1 Material The coating materials (primer and finish coating) shall be dispersions of polytetrafluoroethylene (PTFE) resin solids in a water medium, The primer may be either pigmented or unpigmented. The
15、finish resin coating material shall be unpigmented unless colored material is specified by purchaser. 3.2 Preparation 3.2.1 Cleaning Surfaces, other than anodized aluminum or magnesium, to be coated shall be degreased, chemically cleaned or lightly abrasive blasted, cleaned to remove abrasive partic
16、les, and air dried. Anodized aluminum or magnesium surfaces need only be degreased and dried. 3.2.2 Preheating Immediately prior to coating, metals other than aluminum, magnesium, and copper, shall be preheated to 400 C 5 (752 F 9) to produce a light oxide film and remove any organic contamination a
17、nd air cooled. Preheating of aluminum, magnesium, and copper is not required. (See 8.2). 3.3 Coating 3.3.1 Primer A primer resin coat of 0.0002 to 0.0007 inch (5 to 18 m) dry film thickness shall be applied to the prepared surfaces and fused as in 3.4. SAE AMS2515G Page 3 of 6 3.3.2 Finish The finis
18、h resin coating material shall be applied to the primed surfaces in increments not greater than 0.001 inch (25 m) as required to yield a total dry film thickness not greater than 0.006 inch (152 m). Each coat shall be fused as in 3.4 before application of the succeeding coat. 3.3.2.1 For best corros
19、ion resistance, coated surfaces shall be sanded with 300 to 400 grit paper and cleaned between coats. 3.4 Fusing The resin coating shall be air-dried to a dry, non-glossy appearance or forced-heat dried at 65 to 95 C (149 to 203 F) for 5 to 10 minutes. Each intermediate coat shall be fused at 300 to
20、 330 C (572 to 626 F). The final dried coating shall be fused at 370 to 400 C (698 to 752 F) until fusing is complete. Fusing is complete when the milk-white (for unpigmented material), air-dried film changes to a clear, fused film. Fusing time will vary depending on the mass of metal being coated.
21、Unless otherwise permitted by purchaser, the fused coating shall be quenched in cold water, after the final fusing cycle, to provide maximum coating toughness. Adequate ventilation shall be provided in furnace areas to prevent inhalation of toxic fumes. 3.5 Repair of Damaged Areas Damaged areas shal
22、l be sanded to a feather edge. If basis metal is exposed, a new primer coat shall be applied. As many coats as required to build the film to its original thickness shall be applied, observing the coating thickness requirements of 3.3.2. Each coat shall be fused before application of the subsequent c
23、oat. Care shall be taken to remove any overspray of primer from the original top coat and to apply the resin coating well beyond the perimeter of the damaged area. After air drying, repaired areas shall be fused by means of an open flame. In fusing, heating to a temperature above that at which the c
24、oating changes to a clear, fused film shall be avoided; bright, glowing spots in the film are evidence of overheating and decomposition of the resin. Flame fusing shall be performed only under a hood or forced draft ventilation. 3.6 Properties The fused coating shall conform to the following require
25、ments, determined on representative test panels or on parts chosen at random to represent the lot: 3.6.1 Coating Thickness Shall be as specified on the drawing, determined by micrometer measurement, thickness gage, or other method agreed upon by purchaser and vendor. 3.6.2 Adhesion A representative
26、coated 0.250-inch (6.35-mm) diameter ASTM A 108 steel rod, processed with each lot of parts, shall show no evidence of chalking, blistering, or loss of adhesion, determined by cycling in accordance with MIL-STD-202, Method 102, Condition C, except that the cycling temperature range shall be -60 to +
27、260 C (-76 to +500 F). 3.6.3 Coefficient of Friction Shall be not higher than 0.1, determined on a Timken tester or equivalent at 20 to 30 C (68 to 86 F), a speed of 25 feet/minute 2 (125 mm/s 10), and a load of 10 pounds force 0.1 (45 N 0.4). 3.6.4 Corrosion Resistance A representative part or test
28、 panel of AMS5045, low-carbon steel processed to a dry film thickness of 0.003 to 0.004 inch (76 to 102 m) shall withstand, without evidence of deterioration of the coating or corrosion of the basis metal, exposure for not less than 168 hours to salt spray corrosion test conducted in accordance with
29、 ASTM B 117. SAE AMS2515G Page 4 of 6 3.6.5 Water Vapor Resistance A panel of AMS5045 low-carbon steel processed to a dry film thickness of 0.0045 to 0.0060 inch (114 to 152 m) shall show no blisters in the film and no incipient rusting of the basis metal after exposure to boiling water vapor for no
30、t less than 5 hours. Specimens shall be placed horizontally, with coated side down, across the top of a 400-mL beaker maintained approximately half-full of gently boiling water. 3.6.5.1 By starting with the beaker somewhat more than half full, properly regulating the boiling rate, and allowing the w
31、ater level to drop somewhat below the half-full point, the test of 3.6.5 can run unattended for approximately 8 hours. 3.7 Quality Coatings on parts, as received by purchaser, shall be smooth, uniform, and free from craters, pin holes, sags, runs, bubbles, heavy edges, foreign materials, and other i
32、mperfections detrimental to performance of the coating. 3.7.1 When multiple coatings are applied, each coat shall be free from cracks after fusing, determined by examination under 40X magnification. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The vendor of coated parts shall su
33、pply all samples for vendors tests and shall be responsible for performing all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coated parts conform to the requirements of this specification. 4.2 Classification of Test
34、s 4.2.1 Acceptance Tests Tests for adhesion (3.6.2) and water vapor resistance (3.6.5) are acceptance tests and shall be performed on each batch. Tests for thickness (3.6.1) and appearance (3.7.1) are acceptance tests and shall be performed on each lot. 4.2.2 Preproduction Tests Tests for all techni
35、cal 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 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 S
36、hall be as follows: 4.3.1 For Acceptance Tests Sufficient coated parts or specimens shall be selected at random from each lot to perform all required tests. The number of determinations for each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less
37、 than three. 4.3.1.1 A batch shall be a matched set of primer and finish coat material batches. One primer batch shall be matched with one finish coat batch and batch testing shall be performed on the matched set. Change of the primer or the finish coat shall constitute a new batch. 4.3.1.2 A lot sh
38、all be all parts coated with the same batch of coating material processed under the same fixed conditions and run through the final fusion process at one time. Equipment shutdown shall constitute the termination of the lot. SAE AMS2515G Page 5 of 6 4.3.1.3 When a statistical sampling plan has been a
39、greed upon by purchaser and vendor, sampling shall be in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.5 shall state that such plan was used. 4.3.2 For Preproduction Tests As agreed upon by purchaser and vendor. 4.4 Approval 4.4.1 Sample coated parts shall be approved
40、 by purchaser before coated parts for production use are supplied, unless such approval be waived by purchaser. Results of tests on production coated parts shall be essentially equivalent to those on the approved samples. 4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and m
41、ethods of inspection on production coated-parts which are essentially the same as those used on the approved sample coated parts. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedure, vendor shall submit for reapproval a statement of the
42、proposed changes in ingredients and/or processing and, when requested, sample coated parts. Production parts coated by the revised procedure shall not be shipped prior to receipt of reapproval. 4.5 Reports The vendor of coated parts shall furnish with each shipment a report showing the results of te
43、sts to determine conformance to the acceptance test requirements and stating that the coated parts conform to the other technical requirements. This report shall include the purchase order number, AMS2515G, vendors material designation, lot number, quantity, and identification of the resin system ba
44、ke cycle used. 4.6 Resampling and Retesting If any specimen used In the above tests fails to meet the specified requirements, disposition of the coated parts may be based on the results of testing three additional specimens for each original nonconforming specimen. Failure of any retest specimen to
45、meet the specified requirements shall be cause for rejection of the coated parts represented and no additional testing shall be permitted. Results of all tests shall be reported. 5. PREPARATION FOR DELIVERY 5.1 Packaging 5.1.1 The primer and coating materials shall be packed in separate suitable con
46、tainers marked with not less than the purchase order number, lot number, vendors identification, and quantity. 5.1.2 Containers 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, pa
47、ckaging, and transportation of the coated parts to ensure carrier acceptance and safe delivery. 6. ACKNOWLEDGMENT A vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders. 7. REJECTIONS Coated parts not conforming to this speci
48、fication, or to modifications authorized by purchaser, will be subject to rejection. SAE AMS2515G Page 6 of 6 8. NOTES 8.1 A 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
49、 issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 8.2 Limitations The preheating temperature and the fusing temperature may affect corrosion resistance of some metals or may result in softening o
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