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 revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (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:/www.sae.org/technical/standards/AMS2480H AEROSPACE MATERIAL SPECIFICATION AMS2480 REV. H Issued 1948-05 Revised 2
5、009-07 Reaffirmed 2013-11 Superseding AMS2480G Phosphate Treatment Paint Base RATIONALE AMS2480H has been reaffirmed to comply with the SAE five-year review policy. NOTICE ORDERING INFORMATION: The following information shall be provided to the plating processor by the purchaser. Purchase order shal
6、l specify not less than the following: AMS2480H Basis metal to be treated Tensile strength or hardness of the basis metal Pre-treatment stress relief to be performed by processor (time and temperature) if different from 3.1.1 Special features, geometry, or processing present onparts that requires sp
7、ecial attention by the processor Hydrogen embrittlement relief to be performed by the processor if different from 3.3.2 Quantity of pieces to be treated 1. SCOPE 1.1 Form This specification covers the requirements for producing a zinc phosphate coating on ferrous alloys and the properties of the coa
8、ting. 1.2 Application This process has been used typically to produce a coating that will ensure satisfactory paint adherence, but usage is not limited to such applications. SAE INTERNATIONAL AMS2480H Page 2 of 6 1.3 Safety Hazardous Materials While the materials, methods, applications, and processe
9、s described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards that 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
10、 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 specified herein. The supplier may work to a sub
11、sequent 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 Available from SAE International, 400 Commonwealth
12、 Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS2759/9 Hydrogen Embrittlement Relief (Baking) of Steel Parts AS2390 Chemical Process Test Specimen Material 2.2 ASTM Publications Available from ASTM International, 100 Barr Ha
13、rbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B 117 Operating Salt Spray (Fog) Apparatus ASTM F 519 Mechanical Hydrogen Embrittlement Evaluation of Plating Processes and Service Environments 2.3 U.S. Government Publications Available from the Docu
14、ment 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-PRF-23377 Primer Coatings: Epoxy, High Solids MIL-PRF-85582 Primer Coatings: Epoxy, Waterborne 3. TECHNICAL REQUIREMENTS 3.1 Pr
15、eparation 3.1.1 Steel parts having a hardness of 40 HRC or higher and that have been ground, cold formed or cold straightened after heat treatment shall be cleaned to remove surface contamination and stress relieved before preparation for coating. Temperatures to which parts are heated shall be such
16、 that maximum stress relief is obtained without reducing hardness of parts below drawing limits, but, unless otherwise specified, the stress relief shall be not less than 275 F (135 C) for not less than five hours for parts having hardness of 55 HRC or higher or not less than 375 F (191 C) for not l
17、ess than four hours for other parts. If a higher stress relief temperature is selected, it shall not exceed 50 Fahrenheit (28 Celsius) degrees below the tempering temperature of the basis metal for a minimum of one hour per inch of thickness. 3.1.2 The phosphate coating shall be applied over a surfa
18、ce free from waterbreaks. The cleaning procedure shall not produce pitting or intergranular attack of the basis metal and shall preserve dimensional requirements, SAE INTERNATIONAL AMS2480H Page 3 of 6 3.2 Procedure Parts shall be coated by immersing in, or spraying with, a balanced phosphate soluti
19、on containing a nitrate salt as an accelerating agent. The solution shall be maintained at the temperature recommended by the manufacturer and parts shall be held in contact with the solution for sufficient time to form a uniform, insoluble, crystalline zinc phosphate coating meeting the requirement
20、s of 3.4. Immediately after coating, parts shall be thoroughly rinsed in cold, running water. 3.3 Post Treatment 3.3.1 Chromic Acid Dip After the cold water rinse, parts shall be dipped in dilute chromic acid solution for 20 to 60 seconds at 190 F 10 (88 C 6), and dried. The chromic acid solution sh
21、all be made up of 7.5 ounces of chromic acid in 100 gallons of water (0.56 g/L) with an approximate pH of 5. Other post treatments may be used in place of the chromic acid dip, if approved by the cognizant engineering organization. After drying, parts shall be protected against contamination and sha
22、ll be painted, if applicable, as soon as practicable. 3.3.2 Hydrogen embrittlement relief baking of steel parts having a hardness of 40 HRC or higher shall be in accordance with AMS2759/9 except that parts shall be baked at 210 to 225 F (99 to 107 C) for eight hours. 3.4 Properties The coating shall
23、 conform to the following requirements: 3.4.1 Coverage Prior to post treatment, coated parts and test panels shall have a uniform, dull appearance ranging from light to dark gray, with or without some silvery iridescence. 3.4.2 Corrosion Resistance Phosphate treated, primed and scratched test specim
24、ens shall show no visual evidence of corrosion extending more than 1/8 inch (3.2 mm) on either side of the scratch mark after being subjected to 150 hours of continuous salt spray conducted in accordance with ASTM B 117. Prior to testing, phosphate-treated test specimens shall be coated with a prime
25、r in accordance with either MIL-PRF-23377 or MIL-PRF-85582 to a dry film thickness of 0.0004 to 0.0010 inch (10 to 25 m) and cured in accordance with manufacturers instructions. The primer shall be scratched with a sharp instrument to a depth that cuts through the primer film and phosphate coating,
26、exposing the base metal. The scratch shall be 1 inch (2.5 cm) minimum in length. See 4.3.3.2 3.4.3 Hydrogen Embrittlement The coating process after baking shall not cause hydrogen embrittlement in steel parts 40 HRC (180 ksi) and over determined in accordance with 4.3.3.3. 3.5 Quality Surfaces of tr
27、eated parts, as received by purchaser, shall be uniform in texture and appearance. Powdery areas, excessive buildup, and darkening of corners and edges are not acceptable. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The processor shall supply all samples for processors tests an
28、d shall be responsible for the performance of all required tests. Parts, if required for tests, shall be supplied by purchaser. The cognizant engineering organization reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the processing conforms to the s
29、pecified requirements. SAE INTERNATIONAL AMS2480H Page 4 of 6 4.2 Classification of Tests 4.2.1 Acceptance Tests Coverage (3.4.1) and quality (3.5) are acceptance tests and shall be performed on parts, or specimens representing parts when permitted herein from each lot. See 4.3.3.1. 4.2.2 Periodic T
30、ests Corrosion resistance (3.4.2) is a periodic test and shall be performed at least monthly unless frequency of testing is specified by the cognizant engineering organization. Hydrogen embrittlement (3.4.3) is a periodic test and shall be performed at least once in each month that steel parts 36 HR
31、C and over are plated unless frequency of testing is specified by the cognizant engineering organization. Tests of cleaning and coating solutions are periodic tests and shall be performed at a frequency established by the processor unless frequency of testing is specified by the cognizant engineerin
32、g organization. See 4.4.3 and 8.4. Periodic testing is not required during periods of non-use. Periodic testing must either be completed prior to production restart or periodic test specimens must be processed with the first lot of hardware processed. 4.2.3 Preproduction Tests All property verificat
33、ion tests (section 3.4) are preproduction tests and shall be performed prior to or on the initial shipment of coated parts to a purchaser and when the cognizant engineering organization requires confirmatory testing. 4.3 Sampling for Testing 4.3.1 Acceptance Tests Acceptance test samples shall be ra
34、ndomly selected from all parts in the lot. A lot shall be all parts of the same part number, processed in a continuous series of operations (3.1 through 3.3), in not longer than eight consecutive hours, and presented for processors inspection at one time. Unless the cognizant engineering organizatio
35、n provides a sampling plan, the minimum number of samples shall be shown in Table 1. TABLE 1 - Acceptance Test Sampling Number of Parts in Lot Coverage and Quality Up to 6 All or 3* 7 to 15 7 16 to 40 10 41 to 110 15 111 to 300 25 301 to 500 35 501 to 700 50 701 to 1200 75 Over 1200 125 *Whichever i
36、s less 4.3.2 Periodic Tests Sample quantity shall be two for corrosion resistance. For hydrogen embrittlement, sample quantity shall be as specified in ASTM F 519 unless otherwise specified by the cognizant engineering organization. SAE INTERNATIONAL AMS2480H Page 5 of 6 4.3.3 Sample Configuration 4
37、.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 testing is not practical on actual parts, or it is not economically acceptable to perform destructive
38、 tests on actual parts. Except as specified below, acceptance test specimens shall be made of the same generic class of alloy as the parts, established in accordance with AS2390, distributed within the lot, cleaned, coated, and post-treated with the parts represented. 4.3.3.2 Corrosion Testing Test
39、panels shall be fabricated from low carbon steel measuring 0.025 inch (6.2 mm) minimum thickness and 4 x 2 inches (102 x 51 mm) minimum. Test panels, made of the predominant generic class of alloy as the parts coated in the test period may be used when acceptable to the cognizant engineering organiz
40、ation. 4.3.3.3 Hydrogen Embrittlement Test Test shall be in accordance with the requirements of ASTM F 519 Type 1a.1 using round notched specimens, unless a different specimen is specified by the cognizant engineering organization, stressed in tension under constant load. Coating shall meet the requ
41、irements of this specification on specimen surfaces and shall be visible at the root of the notch. 4.4 Approval 4.4.1 The process and control procedures, a preproduction sample part, or both, whichever is specified, shall be approved by the cognizant engineering organization before production parts
42、are supplied. Preproduction test specimens may be substituted for a preproduction sample part at the discretion of the cognizant engineering organization. 4.4.2 If the processor makes a significant change to any material, process, or control factor from that which was used for process approval, all
43、preproduction tests shall be performed and the results submitted to the cognizant engineering organization for process reapproval unless the change is approved by the cognizant engineering organization. A significant change is one that, in the judgment of the cognizant engineering organization, coul
44、d affect the properties or performance of the parts. 4.4.3 Control factors include, but are not limited to the following: Bath type and control limits Bath temperature controls and limits Hydrogen embrittlement treatment time and temperature Post-treatment solution type and control limits Stripping
45、procedure, if used Periodic test plan for cleaning and processing solutions. See 8.4. 4.5 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 and that they conform to the accep
46、tance test requirements. This report shall include the purchase order number, lot number, AMS2480H, part number, and quantity. 4.6 Resampling and Retesting 4.6.1 If any acceptance test fails to meet specified requirements, parts in that lot may be stripped, recoated as defined herein, and retested.
47、Alternatively, all parts in the lot may be inspected for the nonconforming attribute and those parts nonconforming may be stripped, recoated and post-treated as defined herein, and tested. After stripping and recoating, parts shall meet the dimensions on the drawing. SAE INTERNATIONAL AMS2480H Page
48、6 of 6 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 or adversely affect part dimensions. When parts have been stripped and recoated, the purchaser shall be informed. 4.6.2 If any
49、 periodic test fails to meet specified requirements, the process is nonconforming; no additional parts shall be processed until the process is corrected and new parts or specimens are coated and tested. Results of all tests shall be recorded and, when requested, reported. Purchaser shall be notified of all parts processed since the last acceptable test. 5. PREPARATION FOR DELIVERY
