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 isentirely 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 2012 SAE InternationalAll rights reserved. No part of this publication may be
3、 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 USA)Fax:
4、 724-776-0790Email: CustomerServicesae.orgSAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provide feedbackon this Technical Report, please visithttp:/www.sae.org/technical/standards/AMS2516EAEROSPACEMATERIALSPECIFICATIONAMS2516 REV. EIssued 1963-01Reaffirmed 2003-05Revised 2013-03Superse
5、ding AMS2516DPolytetrafluoroethylene (PTFE) Resin CoatingHigh Build, 698 to 752 F (370 to 400 C) FusionRATIONALEChange the acceptance test requirements to reflect industry practice.1. SCOPE1.1 PurposeThis specification establishes the engineering requirements for producing thick coatings of polytetr
6、afluoroethylene (PTFE) resin on parts and the properties of such coatings.1.2 ApplicationPrimarily to provide dry lubrication, high heat stability, and corrosion protection on parts which operate at not higher than527 F (275 C) for limited periods or not higher than 473 F (245 C) for extended period
7、s. This coating is usually smoother than that of AMS2515. This coating may also be used as a release film for molds.1.3 Safety Hazardous MaterialWhile the materials, methods, applications, and processes described or referenced in this specification may involve theuse of hazardous materials, this spe
8、cification 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.
9、 APPLICABLE DOCUMENTSThe issue of the following documents in effect on the date of the purchase order form 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 docu
10、ment has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.SAE AMS2516E Page 2 of 62.1 SAE PublicationsAvailable from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or
11、724-776-4970 (outside USA), www.sae.org.AMS5045 Steel Sheet and Strip, 0.25 max Carbon, Hard Temper2.2 ASTM PublicationsAvailable 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, Carbon, Cold-Finis
12、hed, Standard QualityASTM B 117 Salt Spray (Fog) Testing2.3 U.S. Government PublicationsAvailable 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/.MIL-STD-202 Test Meth
13、ods for Electronic and Electrical Component Parts3. TECHNICAL REQUIREMENTS3.1 MaterialThe coating materials (primer and finish coating) shall be dispersions of polytetrafluoroethylene (PTFE) resin solids with a small amount of coalescing resin in a water medium. The primer may be either pigmented or
14、 unpigmented. The finish resin coating material shall be unpigmented unless colored material is specified by purchaser.3.2 Preparation3.2.1 Cleaning: Surfaces, other than anodized aluminum, to be coated shall be degreased, chemically cleaned or lightly abrasive blasted, cleaned to remove abrasive pa
15、rticles, and air dried. Anodized aluminum surfaces need only be degreased and dried.3.2.2 Preheating: Immediately prior to coating, metals shall be preheated to 752 F 9 (400 C 5) to produce a light oxide film and remove any organic contamination and air cooled. Preheating of aluminum, magnesium, and
16、 copper is not required (See 8.2).3.3 Coating3.3.1 3ULPHU $ SULPHU UHVLQ FRDW RI WR LQFK WR P GU ILOP WKLFNQHVV VKDOO EH DSSOLHG to the prepared surfaces and fused as in 3.4.3.3.2 Finish: The finish resin coating material shall be applied to the primed surfaces as required to yield the specified tot
17、al dry film thickness. Thickness of each coat shall be 0.002 to 0.003 inch (51 to P IRUWKHILUVWIHZFRDWVEXWshould gradually be decreased to approximately 0.001 inch P DVWRWDOFRDWLQJWKLFNQHVVLQFUHDVHVWRZDUG0.040 inch (1.02 mm). Each coat shall be fused as in 3.4 before application of the succeeding co
18、at.3.3.2.1 For best corrosion resistance, coated surfaces shall be sanded with 300 to 400 grit paper and cleaned between coats.SAE AMS2516E Page 3 of 63.4 FusingThe resin coating shall be air-dried to a dry, non-glossy appearance or forced-heat dried at 149 to 203 F (65 to 95 C) for 5 to 10 minutes.
19、 Each intermediate coat shall be fused at 572 to 626 F (300 to 330 C). The final dried coating shall be fused at 698 to 752 F (370 to 400 C) 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 va
20、ry depending on the mass of metal being coated. 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
21、.3.5 Repair of Damaged AreasDamaged areas shall 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 b
22、e fused before application of the subsequent coat. 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, reworked areas shall be fused by means of an open flame. In fusing, heat
23、ing to a temperature above that at which the coating 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 PropertiesThe fused co
24、ating shall conform to the following requirements, 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
25、and vendor.3.6.2 Adhesion: A representative coated 0.250-inch (6.35-mm) diameter ASTM A 108 low-carbon 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, exce
26、pt that the cycling temperature range shall be -76 to +500 F (-60 to +260 C).3.6.3 Coefficient of Friction: Shall be not higher than 0.1, determined on a Timken tester at 68 to 86 F (20 to 30 C), 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
27、Resistance: A representative part or test panel of AMS5045 low-carbon steel processed to a dry film thickness of 0.003 to 0.004 inFK WRP VKDOOZLWKVWDQGZLWKRXWHYLGHQFHRI deterioration of the coating or corrosion of the basis metal, exposure for not less than 168 hours to salt spray corrosion test con
28、ducted in accordance with ASTM B 117.3.6.5 Water Vapor Resistance: A panel of AMS5045 low-carbon steel, processed to a dry film thickness of 0.0045 to LQFK WRP VKDOOVKRZQREOLVWHUVLQWKHILOP DQGQRLQFLSLHQWUXVWLQJ of the basis metal after exposure to boiling water vapor for not less than 96 hours. Spec
29、imens shall be placed horizontally, with coated side down, across the top of a 400-mL beaker maintained approximately half-full of gently boiling water (See 3.6.5.1).3.6.5.1 By starting with the beaker somewhat more than half full, properly regulating the boiling rate, and allowing the water level t
30、o drop somewhat below the half-full point, the test of 3.6.5 can run unattended for approximately eight hours.3.7 QualityCoating 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 imperfection
31、s detrimental to performance of the coating.SAE AMS2516E Page 4 of 63.7.1 When multiple coatings are applied, each coat shall be free from cracks after fusing, determined by examination under 40X magnification.4. QUALITY ASSURANCE PROVISIONS4.1 Responsibility for InspectionThe vendor of coated parts
32、 shall supply 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
33、 of Tests4.2.1 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
34、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 ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required.4.2.2.1 For direc
35、t U.S. Military procurement, substantiating test data and, when requested, preproduction test material shall be submitted to the cognizant agency as directed by the procuring activity, contracting officer, or request for procurement.4.3 Sampling and TestingShall be as follows:4.3.1 For Acceptance Te
36、sts: 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 than three.4.3.1.1 A batch shall be a mat
37、ched 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 shall be all parts coated with the same batch
38、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.4.3.1.3 When a statistical sampling plan has been agreed upon by purchaser and vendor, sampling shall be in accordance wi
39、th 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 Approval4.4.1 Sample coated parts shall be approved by purchaser before coated parts for production use are supplied, unles
40、s such approval be waived by purchaser. Results of tests on production coated parts shall be essentially equivalent to those on the approved samples.SAE AMS2516E Page 5 of 64.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production coated parts w
41、hich 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 proposed changes in ingredients and/or processing
42、 and, when requested, sample coated parts. Production parts coated by the revised procedure shall not be shipped prior to receipt of reapproval.4.5 ReportsThe vendor of coated parts shall furnish with each shipment a report showing the results of tests to determine conformance to the acceptance test
43、 requirements and stating that the coated parts conform to the other technical requirements. This report shall include the purchase order number, AMS2516E, vendors material designation, lot number, quantity, and identification of the resin system bake cycle used.4.6 Resampling and RetestingIf any sp
44、ecimen 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 meet the specified requirements shall be cause for re
45、jection of the coated parts represented and no additional testing shall be permitted. Results of all tests shall be reported.5. PREPARATION FOR DELIVERY5.1 Packaging5.1.1 The primer and coating materials shall be packed in separate containers marked with not less than the purchase order number, lot
46、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, packaging, and transportation of the coated parts to ensure carrier
47、acceptance and safe delivery.6. ACKNOWLEDGMENTA vendor shall mention this specification number and its revision letter in all quotations and when acknowledging purchase orders.7. REJECTIONSCoated parts not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection.8. NOTES8.1 A 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 document. An (R) symbol to the left of the document tit
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