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 2009 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: 724-776-4970 (outside USA)
4、 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/AMS2466B AEROSPACE MATERIAL SPECIFICATION AMS2466B Issued 1997-07 Revised 2009-03 Superseding AM
5、S2466A Hard Anodic Coating of Magnesium Alloys Alkaline Type, High Voltage RATIONALE AMS2466B results from a Five Year Review and update of this specification. NOTICE ORDERING INFORMATION: The following information shall be provided to the processor by the purchaser. 1) Purchase order shall specify
6、not less than the following: g120 AMS 2466B g120 Basis metal to be anodized g120 Class (1.3) g120 Special instructions, such as post-treatment (3.3.4). g120 Quantity of pieces to be anodized 2) Parts manufacturing operations such as heat treating, forming, joining and media finishing can affect the
7、condition of the substrate and adversely affect the finished part. The sequencing of these types of operations should be specified by the cognizant engineering organization or purchaser and is not controlled by this specification. 1. SCOPE 1.1 Purpose This specification covers the requirements for a
8、 hard anodic coating on magnesium alloys. 1.2 Application This coating has been used typically to provide corrosion resistance and abrasion resistance to cast magnesium alloys, but usage is not limited to such applications. 1.3 Classification Anodic finishes are classified by coating thickness as fo
9、llows: Class 1 Thin Coating: Coating thickness in the range of 0.0002 to 0.0004 inch (5 to 10 m). Class 1H Heavy Coating: Coating thickness in the range of 0.0005 to 0.0007 inch (13 to 18 m). Class 2 Thick Coating: Coating thickness in the range of 0.0008 to 0.0010 inch (20 to 25 m). Copyright SAE I
10、nternational Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2466B Page 2 of 7 1.3.1 If a class is not specified, Class 1 shall be supplied. 1.4 Safety-Hazardous Materials While the materials, methods, applications, and
11、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 familiarity with the safe and proper use of any hazardous materia
12、ls and to 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 supplied herein. The supplier may work
13、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 has been specified, the last published issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Comm
14、onwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS4418 Magnesium Alloy Castings, Sand Castings, 2.5Ag-2.1Di-0.70Zr (QE22A-T6), Solution and Precipitation Heat Treated AMS4429 Magnesium Alloy Castings, Sand Castings, 2.
15、8Nd-1.4Gd-0.4Zn-0.6Zr (EV31A-T6), Solution and Precipitation Heat Treated AMS4439 Magnesium Alloy Castings, 4.2Zn - 1.2Rare Earths - 0.70Zr, (ZE41A-T5), Precipitation Heat Treated AMS4446 Magnesium Alloy Castings, Sand Castings, 8.7Al - 0.70Zn - 0.26Mn, (AZ91E - T6), Solution and Precipitation Heat
16、Treated AS2390 Chemical Process Test Specimen Material 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 B 117 Operating Salt Spray (Fog) Apparatus ASTM B 244 Measurement of Thickness
17、 of Anodic Coatings on Aluminum and of Other Nonconductive Coatings on Nonmagnetic Basis Metals With Eddy-Current Instruments ASTM B 487 Measurement of Metal and Oxide Coating Thickness by Microscopical Examination of a Cross Section ASTM D 1193 Reagent Water ASTM D 1654 Evaluation of Painted or Coa
18、ted Specimens Subjected to Corrosive Environments ASTM D 4060 Abrasion Resistance of Organic Coatings by the Taber Abraser 3. TECHNICAL REQUIREMENTS 3.1 Equipment 3.1.1 Tanks shall be fabricated from, or lined with, a material that is compatible with the baths used for cleaning, pretreatment, anodiz
19、ing, or post-treatment solutions and shall be equipped with temperature controls capable of controlling the bath temperatures within specified limits. 3.1.2 Fixtures Hooks, clamps, and racks used to suspend parts in the electrolyte, and which are in contact with the electrolyte, shall be fabricated
20、from magnesium or magnesium alloys, or from aluminum alloys containing magnesium (5000 or 6000 series). Such fixtures shall be protected with suitable maskant at the electrolyte-air interface. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networki
21、ng permitted without license from IHS-,-,-SAE AMS2466B Page 3 of 7 3.2 Preparation 3.2.1 Tight electrical contact shall be maintained during the anodic treatment to prevent contact arcing (burning) of parts, but small irregularities of coating at points of electrical contact are acceptable. For part
22、s which are to be anodized all over, locations shall be acceptable to purchaser. For parts which are not to be anodized all over, locations shall be in areas on which anodize is not required. 3.2.2 Parts shall have clean surfaces, free from water break, prior to immersion in the anodizing solution.
23、See 8.3. 3.3 Procedure 3.3.1 Pretreatment The cleaned parts shall be immersed for 30 to 90 minutes in an aqueous solution of 83 to 102 grams per liter ammonium fluoride solution, with a pH of 6.0 to 6.8, and operated at 160 to 180 F (71 to 82 C) followed by a water rinse. 3.3.2 Anodizing shall be ac
24、complished in an aqueous, chromate-free, alkaline electrolyte with the parts made the anode using voltage and current densities that produce an anodize coating conforming to specified properties. During anodizing, parts shall be oriented so as to prevent gas entrapment. 3.3.3 After coating, part sha
25、ll be thoroughly rinsed in cold running water and dried. 3.3.4 Post-Treatment When post-treatment is specified, parts shall be immersed in a bath containing 108 to 132 grams per liter sodium dihydrogen phosphate (NaH2PO4) in water meeting ASTM D 1193, Type IV, maintained at a pH of 4.3 to 4.5 and a
26、temperature of 115 to 125 F (46 to 52 C). Immersion time shall be 30 to 60 seconds for Class 1 or 1H and 1 to 2 minutes for Class 2. Post treatment shall be followed by rinsing in cold water, hot reagent water, and drying.3.4 Properties Coated parts shall conform to the following requirements: 3.4.1
27、 Coating thickness shall be 0.0002 to 0.0004 inch (5 to 10 m) for Class 1 coatings, 0.0005 to 0.0007 inch (13 to 18 m) for Class 1H, and 0.0008 to 0.0010 inch (20 to 25 m) for Class 2 coatings, determined in accordance with any of the following methods as applicable: ASTM B 244, ASTM B 487, or other
28、 method acceptable to the cognizant engineering organization. 3.4.2 Corrosion Resistance For each Class anodized during the month, coated samples shall be subjected for not less than the applicable time shown in Table 1 to salt spray corrosion test in accordance with ASTM B 117. The exposed surfaces
29、 of the panels shall show a rating of nine or greater after exposure, determined in accordance with ASTM D 1654, procedure B. Corrosion resistance of coatings applied to other alloys may be specified by the cognizant engineering organization. TABLE 1 - Corrosion Resistance Requirements Panel Materia
30、l Coating Class Salt Spray Resistance Hours AMS4439 1 24 AMS4439 2 72 AMS4446 1 168 AMS4446 2 336 AMS4429 1 168 AMS4429 2 336 AMS4418 1 24 AMS4418 2 72 Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,
31、-SAE AMS2466B Page 4 of 7 3.4.3 Wear Resistance Coated panels of AMS4439, AMS4418 and AMS4446 shall exhibit a wear index value less than 30 and a wear cycle rating greater than 5000 cycles for each 0.001 inch (25 g80m) coating thickness when tested in accordance with ASTM D 4060 except that the CS-1
32、7 wheel shall be resurfaced after every 1000 cycles by running it for 25 cycles against the resurfacing medium, S-11 abrasive disk. Wear resistance test is applicable to all coating classes. Wear resistance requirements for coatings on other alloys may be specified by the cognizant engineering organ
33、ization. Coated panels of AMS4429 shall exhibit a wear index value less than 35 and a wear cycle rating greater than 5000 cycles for each 0.001 inch (25 g80m) coating thickness when tested in accordance with ASTM D 4060 except that the CS-17 wheel shall be resurfaced after every 1000 cycles by runni
34、ng it for 25 cycles against the resurfacing medium, S-11 abrasive disk. Wear resistance test is applicable to all coating classes. Wear resistance requirements for coatings on other alloys may be specified by the cognizant engineering organization 3.4.4 Electrical Continuity Coatings shall not condu
35、ct electricity when tested with a properly functioning, conventional, low-voltage continuity or resistance tester or the specific instrument specified by the cognizant engineering organization. Contact the surface of the anodic-coated part with the leads. Monitor the instrument for conduction of ele
36、ctricity. 3.5 Quality Surfaces of coated parts, as received by purchaser, shall be uniform in texture and appearance except at the points of electrical contact and in pockets where gas was unavoidably trapped during processing. Powdery areas, laminations, pits, and other evidence of burning are not
37、acceptable. Darkened corners or edges and excessive buildup are not acceptable. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The processor shall supply all test panels when required for processors tests, and shall be responsible for the performance of all required tests. When pa
38、rts are to be tested, the parts 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 processing conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Test
39、s Coating thickness (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 Tests Corrosion resistance (3.4.2) wear resistance (3.4.3)and electrical continuity (3.4.4) are period
40、ic tests and shall be performed at least monthly unless frequency of testing is specified by the cognizant engineering organization. Tests of the cleaning and processing solutions are periodic tests and shall be performed at a frequency established by the processor unless frequency of testing is spe
41、cified by the cognizant engineering organization. See 8.5 and 4.4.3. 4.2.3 Preproduction Tests All property verification tests (section 3.4) are preproduction tests and shall be performed prior to production and when the cognizant engineering organization requires confirmatory testing. Copyright SAE
42、 International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE AMS2466B Page 5 of 7 4.3 Sampling for Testing 4.3.1 Acceptance Tests Acceptance test samples shall be randomly selected from all parts in the lot. A lot shall b
43、e all parts of the same part number, coated in the same baths in not longer than 8 consecutive hours, and presented for processors inspection at one time. Unless the cognizant engineering organization provides a sampling plan, the minimum number of samples shall be in accordance with Table 2. TABLE
44、2 - Sampling For Acceptance Tests Number of Parts in Lot Quality (Visual) Thickness 1 to 6 All All or 3* 7 to 15 7 4 16 to 40 10 4 41 to 110 15 5 111 to 300 25 6 301 to 500 35 7 501 to 700 50 8 701 to 1200 75 10 Over 1200 125 15 *Whichever is less 4.3.2 Periodic and Preproduction Tests Sample quanti
45、ties shall be not less than three for corrosion, one for electrical continuity, and one for wear resistance unless otherwise specified by the cognizant engineering organization. 4.3.3 Sample Configuration 4.3.3.1 Separate test specimens may be used under any one of the following circumstances: The p
46、arts 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 tests on actual parts. Except as specified below, acceptance test specimens shall be made of
47、the same generic class of alloy as the parts, established in accordance with AS2390, distributed within the lot, cleaned, anodized, and post treated with the parts. 4.3.3.2 Corrosion resistance test panels shall be a minimum of 4 x 5 inches (102 x 127 mm). 4.4 Approval 4.4.1 Process and control fact
48、ors, a preproduction sample, 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 control factor from that which was used for proc
49、ess approval, all 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 which, in the judgment of the cognizant engineering organi
