NAVISTAR MPAPS G-4523-2017 Corrosion-Resistant Zinc-Aluminum Integrally Lubricated Inorganic Coating.pdf
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1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. MAY 2017 Page 1 of 4 NAVISTAR, INC. Material, Parts, and Process Specifications (
2、MPAPS) NUMBER: MPAPS G-4523 Former Designation: TMS-4523 TITLE: Corrosion-Resistant Zinc-Aluminum Integrally Lubricated Inorganic Coating CURRENT REV No.: 1705 DATE: May 2017 WRITTEN/EDITED BY: W. Cook APPROVED BY: R. Goluch SUPERSEDES: February 2006 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED
3、FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applica
4、bility of regulatory limits prior to use. 1.0 APPLICATION This specification covers the requirements for a silvery, corrosion resistant, non-electrolytically applied, water-based coating for steel substrates. The coating is heat-converted from an aqueous dispersion of zinc and aluminum flakes, and c
5、ontains a PTFE lubricant dispersed through the film thickness. This coating system is free of both hexavalent and trivalent chromium, and is suitable for high hardness parts since hydrogen embrittlement is not induced by the process. Typical applications include interior and exterior parts requiring
6、 lubrication and good corrosion resistance, externally and internally threaded fasteners M5 and larger, internally recessed fasteners, stampings, brackets, clips, clamps, etc. (For internal recessed fasteners, such as socket head or Torx head screws, it is recommended that the coating be applied via
7、 dip-spin tilt-tumble equipment.) This coating should not be used on parts which will come in contact with uncoated copper, magnesium, or stainless steel, but will provide good bi-metallic corrosion resistance when in contact with aluminum. Coating should not be used on materials which might be adve
8、rsely affected by a cure temperature range of 288-315C (550-600F). The maximum continuous service temperature is 280C (536F). 2.0 SCOPE This specification covers the general coating requirements, part performance, fastener torque-tension requirements, quality, KCC, source approval and quality contro
9、l, packing, shipping, and identification requirements, designation on drawings, and approved products. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. NUMBE
10、R: MPAPS G- 4523 TITLE: Corrosion-Resistant Zinc-Aluminum Integrally Lubricated Inorganic Coating REVISION: 1705 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent lia
11、bility. 2017 by Navistar, Inc. MAY 2017 Page 2 of 4 3.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced standards shall apply. The following standards, specifications and regulations are referenced in this specification. Quality System Standard QS-9000 (ISO 9000 or
12、 TS-16949) ASTM D 610 CFR Title 29, Part 1910 SAE/USCAR-11 NAVISTAR IQR Quality Standard ASTM B 117 NAVISTAR Engr. Design Standard A-16 SAE J2334 NAVISTAR Supplier Packing and Shipping Std. D-13. NAVISTAR MPAPS B-50 4.0 GENERAL REQUIREMENTS 4.1 Coating Requirements 4.1.1 Appearance Coated parts shal
13、l be uniform in color, and free from runs, sags, cracks, pores/blisters, and rough spots. The coating shall be dry to the touch, and not feel oily or tacky. 4.1.2 Thickness This coating will typically consist of 2 layers, having a typical total thickness of 6-10 m min. (or coating weight of 24 g/m2
14、min.). The coating shall not have an adverse effect on production assembly and disassembly practices. After coating, the parts must pass the appropriate thread GO gages without sticking or binding. An evaluation of coating thickness on threads will be included in the Quality Control Plan for each pa
15、rt. 4.2 Part Performance 4.2.1 Adhesion After curing, coated parts shall show no flaking, peeling, or loss of adhesion with normal handling. Parts shall show no evidence of blistering, flaking, peeling, or appearance changes, after heating coated parts to 120C for 60 minutes. 4.2.2 Flexibility Coati
16、ng shall withstand normal handling and storage conditions without chipping and shall be capable of withstanding the normal extension and compression of springs and normal flexing of parts such as spring clips during assembly without loss of adhesion. 4.2.3 Corrosion Resistance Coated parts shall be
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