1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 04 2013 10 23 Revised Replaced by WSS-M1P87-B2 G. Weber, NA 2013 07 12 N Status No replacement G. Weber, NA 1991 08 02 NC00-E10138962-001 Released J.B. Spencer Copyright 2013, Ford Global Technologies, LLC Page 1 of 2 PLATING, ZINC/NICKE
2、L WSA-M1P87-A1 NOT TO BE USED FOR NEW DESIGN 1. SCOPE This specification defines performance requirements for alloy coatings of zinc/nickel electrolytically deposited on ferrous surfaces from alkaline baths where corrosion protection treatment is required. A supplementary hexavalent chromium free co
3、ating and/or trivalent chrome may be applied. 2. APPLICATION This specification was released originally to define performance requirements for zinc/nickel alloy coatings with hexavalent chromium free conversion coatings over power steering lines. 3. REQUIREMENTS All requirements must be met to achie
4、ve acceptable field durability. No one requirement, exclusive of others, is capable of ensuring satisfactory performance. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111
5、-A). 3.2 PLATING THICKNESS, min 8 m (ASTM B 659) The plating thickness requirements identified above represent the minimum values and apply to all significant surfaces unless otherwise specified on the engineering drawing. In case of dispute, the thickness measurement umpire method shall be metallog
6、raphic sectioning per ASTM B 487. 3.3 ACCELERATED CORROSION RESISTANCE 768 h (ASTM B 117) Evidence of base metal red rust corrosion products on significant surfaces following testing when evaluated without supplementary magnification at normal reading distance constitutes failure. Note: Testing to b
7、e done on tubes formed after plating. ENGINEERING MATERIAL SPECIFICATION WSA-M1P87-A1 Copyright 2013, Ford Global Technologies, LLC Page 2 of 2 3.4 ZINC AND NICKEL CONTENT Zinc 45.0 75.0 grams/meter2Nickel 5.0 7.5 grams/meter2Suitable method for determining the metal content include atomic absorptio
8、n. 3.5 PLATING ADHESION (ASTM B 571) 3.5.1 Grind Saw Test No lifting or peeling of the electroplate from the substrate. 3.5.2 Burnishing Test No blistering, lifting or peeling of the electroplate from the substrate. 3.6 EMBRITTLEMENT Parts plated to this specification shall be free from the detrimen
9、tal effects of hydrogen embrittlement or other factors which result in part brittleness. All parts shall meet the requirements of WSS-M99A3-A. 4. GENERAL INFORMATION The information give below is provided for clarification and assistance in meeting the requirements of this specification. Contact fo
10、r questions concerning Engineering Material Specifications. 4.1 SIGNIFICANT SURFACES Unless otherwise specified on the engineering drawing, significant surfaces are defined as those surfaces of the finished part that: are directly visible and/or visible by reflection when the finished part is assembled in position; can be the source of corrosion products directly visible by reflection. 5. SUMMARY OF REVISIONS 2004 03 17 Revised. Returned to active status, rev title, para 1 and 2 2004 01 27 N-STATUS. See Materials Engineer for Replacement.
