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/AMS2526D AEROSPACE MATERIAL SPECIFICATION AMS2526 REV. D Issued 1979-05 Revised 2013-01 Super
5、seding AMS2526C Molybdenum Disulfide Coating, Thin Lubricating Film Impingement Applied RATIONALE This revision results from a Five Year Review and update and includes changes to achieve similarity with other AMS impingement coating documents. 1. SCOPE 1.1 Form This specification covers requirements
6、 for a coating consisting of finely-powdered molybdenum disulfide in a heat-resistant inorganic binder applied to parts. 1.2 Application This product has been used typically on metal parts and selected nonmetallic materials requiring a coating under 0.0002 inch (5 m) thick (See 8.4) for reducing fri
7、ction or wear, or for minimizing galling, but usage is not limited to such applications. This lubricating film may be applied to surfaces of ferrous and nonferrous metals and alloys, thermoplastic and thermosetting polymers, and rubber (O-rings, seals, etc). Aluminum, magnesium, and ferrous alloys,
8、other than corrosion-resistant types, either coated or in contact with other parts having this coating, may be susceptible to corrosion. 1.3 Safety - Hazardous Materials While the materials, methods, applications, and processes described or referenced in this specification may involve the use of haz
9、ardous 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 proper use of any hazardous materials and to take necessary precautionary measures to ensure the health and safety of
10、 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 specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specif
11、ied. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply. SAE AMS2526D Page 2 of 7 2.1 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19
12、428-2959, Tel: 610-832-9585, www.astm.org. ASTM D 1186 Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to a Ferrous Base ASTM D 2510 Adhesion of Solid Film Lubricants ASTM D 2714 Calibration and Operation of the Falex Block-on-Ring Friction and Wear Testing Machine 2
13、.2 American Society for Quality Publications Available from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946 (North America) or +1-414-272-8575 (International), www.asq.org. ANSI / ASQC Z1.4-2003 Sampling Procedures and Tables for Inspection by Attrib
14、utes 3. TECHNICAL REQUIREMENTS 3.1 Coating Material Shall consist of finely-powdered molybdenum disulfide in a heat resistant inorganic binder. The coating, properly applied, shall form a lubricating film conforming to the requirements of 3.3. 3.2 Procedure 3.2.1 Cleaning Before applying the coating
15、, surfaces of the basis material shall be thoroughly cleaned with minimum abrasion or erosion. The cleaned surfaces shall be free from oxides and from foreign materials detrimental to coating adhesion. 3.2.2 Masking (and removal) For parts with surfaces on which coating is not permitted, masking sha
16、ll be applied (and removed after coating) by a method that will not change the properties of the base material or the applied coating. External shielding between the impingement nozzle and the part may be used instead of masking the part if its effectiveness can be demonstrated by inspection. 3.2.3
17、Surface Finishing Surfaces of parts to be coated shall be honed with 120 to 400 mesh aluminum oxide powder to prepare the basis material for coating. To provide the proper surface for bearing applications, remove all residual metallic particles, whether mechanically or electrostatically held. The cl
18、eaning method may be the same or different from the one used in 3.2.1, depending on suitability. 3.2.4 Coating The coating material shall be applied to all specified surfaces by spraying at high velocity (impinging) under controlled conditions. 3.2.5 Curing Curing temperature shall not exceed 310 F
19、(154 C). Curing temperature shall be acceptable to the cognizant engineering organization to ensure that the substrate material properties are not be affected by the curing conditions. SAE AMS2526D Page 3 of 7 3.2.6 Preservation Unless otherwise specified by purchaser,after curing, a supplementary p
20、reservative treatment shall be applied to metallic parts subject to corrosion. The preservative treatment shall be removable by vapor degreasing or other suitable process. 3.3 Properties The coating shall conform to the following requirements: 3.3.1 Adhesion A pressure-sensitive film-backed tape wit
21、h an adhesion of not less than 45 ounces per inch (12.5 N/25.4 mm), shall be applied to a flat surface of a coated specimen, rolled in place, and rapidly removed in accordance with ASTM D 2510, Procedure B. The lifting of flakes or particles of the coating from the specimen, exposing the basis metal
22、, is not acceptable. A uniform deposit of powdery material clinging to the tape is acceptable. 3.3.2 Thickness Thickness shall be not greater than 0.0002 inch (5 m), determined in accordance with ASTM D 1186 or by a method acceptable to the cognizant engineering organization. An alternate method is
23、required if the ASTM D 1186 method is not practical (for example, on a non-magnetic substrate). 3.3.3 Wear Life: The average of specimen time to failure shall be not less than 15 minutes, determined in accordance with ASTM D 2714, Procedure A, and the following: 3.3.3.1 Test Procedure 3.3.3.1.1 Prep
24、are specimens in accordance with 3.1 through 3.2.2. 3.3.3.1.2 Prepare wear tester in accordance with ASTM D 2714, Procedure A. 3.3.3.1.3 Load coated specimens (ring and block) on machine. 3.3.3.1.4 Adjust counters to zero. 3.3.3.1.5 Run machine for five seconds 3 to ensure alignment of ring and bloc
25、k. 3.3.3.1.6 Place a one-pound (454 g) weight on the bale rod. Do not overload. Run machine for 60 seconds 5. 3.3.3.1.7 Place a second one-pound (454 g) weight on bale rod. Do not overload. Run machine for 60 seconds 5. 3.3.3.1.8 Place a third one-pound (454 g) weight on bale rod and run to failure.
26、 Test time starts at the time of the loading of the first weight. Each one pound (454 g) weight is equal to 30 pounds (13.6 kg) at ring and block due to configuration of the testing machine. 3.4 Quality Coating on parts, as received by purchaser, shall be uniform in color, smooth, adherent to basis
27、material and free from surface imperfections detrimental to performance of the coating. Evidence of porosity, blistering, or other conditions detrimental to performance of the coating is not acceptable. SAE AMS2526D Page 4 of 7 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The co
28、ating processor shall supply all samples for processors tests and shall be responsible for the performance of all required tests. Actual parts, when required for tests, shall be supplied by the purchaser. The cognizant engineering organization reserves the right to sample and to perform any confirma
29、tory testing deemed necessary to ensure that the coating conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Adhesion (3.4.1) and quality (3.5) are acceptance tests and shall be performed on parts, or specimens representing parts when permitted, from each lot. 4.2.
30、2 Periodic Tests Thickness (3.4.2) and wear life (3.4.3) are periodic tests and shall be performed not less than annually unless frequency of testing is otherwise specified specified by the purchaser. 4.2.3 Preproduction Tests All technical requirements are preproduction tests and shall be performed
31、 prior to or on the initial shipment of a coated part to a purchaser, when a change in material and/or processing requires reapproval as in 4.4.2, and when the cognizant engineering organization deems confirmatory testing to be required. 4.3 Sampling and Testing: Shall be in accordance with the foll
32、owing: A lot shall be all parts of the same material, size, and shape, coated in a continuous series of operations in not more than eight consecutive hours, cured at the same time under the same conditions, and presented for processors inspection at one time. Except as noted, actual parts shall be s
33、elected as samples for test. Nondestructive testing shall be performed whenever practical and authorized herein. 4.3.1 Acceptance Tests Sampling shall be as shown in Table 1. Test samples shall be randomly selected from all parts in the lot. TABLE 1 - SAMPLING FOR ACCEPTANCE Number of Parts in Lot Q
34、uality Adhesion 1 to 6 All 2 7 to 15 7 2 15 to 40 10 2 41 to 110 15 3 111 to 300 25 3 301 to 500 35 4 501 to 700 50 4 Over 700 75 5 4.3.1.1 Adhesion When size and/or configuration prevents testing of parts, specimens shall be processed with each lot and tested as in 3.4.1. SAE AMS2526D Page 5 of 7 4
35、.3.1.2 Quality Visual inspection samples shall be selected at random in accordance with ANSI Z1.4 4.3.2 Periodic Tests Unless otherwise specified by the cognizant engineering organization, sampling for periodic testing shall be as follows. 4.3.2.1 For thickness testing, two samples in accordance wit
36、h 4.3.4.2. 4.3.2.2 For wear life testing, a minimum of two samples in accordance with 3.4.3. 4.3.3 Preproduction Tests Sampling for preproduction testing shall be as agreed upon by the cognizant engineering organization and processor. 4.3.4 Specimens Specimens for adhesion (3.3.2) and thickness (3.3
37、.3) shall be as follows: 4.3.4.1 Adhesion Test specimens, approximately 0.20 x 1 x 4 inches (5 x 25 x 102 mm), shall be made from 3003-H14 aluminum alloy. 4.3.4.2 Thickness Test panels, approximately 0.20 x 2 x 4 inches (5 x 51 x 102 mm), shall be made from cold-rolled, low-carbon steel. 4.4 Approva
38、l 4.4.1 The process and control procedures, or a preproduction sample part, or both, whichever is specified by purchaser, shall be approved by the cognizant engineering organization before production parts are supplied. 4.4.2 If the processor makes a significant change to any material, process, or c
39、ontrol factor from that which was used for process approval, all preproduction tests shall be performed and the results submitted to the purchaser for process reapproval unless the change is approved by the cognizant engineering organization. A significant change is one which, in the judgment of the
40、 cognizant engineering organization, could affect the properties or performance of the parts. Production parts plated by the revised procedure shall not be shipped prior to receipt of reapproval. 4.4.3 Control factors shall include, but not be limited to the following Surface preparation and cleanin
41、g methods Coating material trade name and manufacturer Impingement procedure and parameters Stripping procedure, when applicable Curing conditions Type of preservative, if applied Periodic test plan SAE AMS2526D Page 6 of 7 4.5 Reports The processor of coated parts shall furnish with each shipment a
42、 report showing the results of tests to determine conformance to the acceptance test requirements and stating that the coating conforms to the other technical requirements. This report shall include the purchase order number, lot number, AMS2526D, part number of the coated parts, and quantity. 4.6 R
43、esampling and Retesting 4.6.1 If any acceptance test fails to meet specified test requirements, the parts in that lot may be stripped and recoated as defined herein and retested. Alternatively, all parts in the lot may be inspected for the nonconforming attribute, and the nonconforming parts may be
44、stripped and recoated as defined herein and retested. After stripping and recoating, parts shall meet the dimensions on the drawing. 4.6.1.1 When stripping is performed, the method shall be acceptable to the cognizant engineering organization and shall not roughen, pit, or embrittle the basis metal
45、or adversely affect part dimensions. When parts have been stripped and recoated, the cognizant engineering organization shall be informed. 5. PREPARATION FOR DELIVERY 5.1 Packaging Packaging shall be accomplished to ensure that coated parts, during shipment and storage, will be protected against dam
46、age from exposure to weather or any other normal hazard. 5.1.1 Each container of coated parts shall be legibly marked with not less than the purchase order number, lot number, AMS2526D, processors identification, part number, and quantity. 5.1.2 Packages of coated parts shall be prepared for shipmen
47、t 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 The processor shall mention AMS2526D in all quotations and
48、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. 8. NOTES 8.1 A change bar (|) located in the left margin is for the convenience of the user in locating area
49、s where technical revisions, not editorial changes, have been made to the previous issue of a specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revision. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only. 8.2 Terms used in this AMS are clarified in ARP1917. 8.3 Dimensions and proper
