1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 09 28 N-STATUS No replacement G. Weber, NA 2003 07 31 Revised Para 3.0 inserted; Para 3.1, 3.4, 4 deleted 1994 10 31 NGA1E10370437010 Released S. Renko Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, Inc. Page 1
2、of 2 PLATING, CHROMIUM, FASTENERS WSS-M1P91-A1 NOT TO BE USED FOR NEW DESIGN 1. SCOPE This specification defines the performance requirements for electrodeposited chromium and other metals for the decoration and corrosion protection of ferrous and non-ferrous substrates. 2. APPLICATION This specific
3、ation was released originally for use on fasteners where the chromium luster is a styling requirement. This finish provides a degree of corrosion resistance but this should not be the primary criteria for selection. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material supplier
4、s and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 MINIMUM PLATING THICKNESS, micrometer, and CORROSION RESISTANCE Plating on Low Carbon Steel Ni Alloy 5.0* Zn NI 7.5 Copper 7.5 Nickel 5.0 Chromium 0.3 *This layer shall have the abi
5、lity to preferentially fill defects in the base metal by depositing a greater thickness at the bottom of the defect (lap, pit, crack) than on the adjacent significant surface. Plating on Austenitic Stainless Steel* Nickel 7.6 Chromium 0.25 *Activation plating treatment required. ENGINEERING MATERIAL
6、 SPECIFICATIONWSS-M1P91-A1 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, Inc. Page 2 of 2 3.3 CASS TEST 16 h (ASTM B 368) Prior to corrosion testing, screws shall be driven into a steel panel using 50% of the minimum torsional strength as specified in the appropriate Perf
7、ormance Specification for the fastener. Assemble samples to a sample holder designed for the configuration of the fastener. Sample holders shall be made of an inert corrosion resistant material such as acrylics, polyvinyl chloride or similar material. The holder size and thickness depends upon the s
8、ize and number of fasteners being tested. No wood shall be used in the construction of sample holders as the sap acidity can affect the corrosion result. Place the holder and samples in the cabinet with the holder at 25 +/- 5 from the vertical and with the significant surface facing the principal direction of horizontal flow of fog through the chamber. The finished part shall pass the specified CASS cycle with no evidence of red rust or other discoloration on significant surfaces.
