1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2011 02 24 N-STATUS Replaced by WSS-M2P192-A1 T. Covert, NA 2006 06 21 Revised WSS-M1A343-A1 inactivated and taken off of the specification, replaced by WSS-M1A343-A2 J. Lott 1999 05 03 Activated J. Lott Printed copies are uncontrolled Copyri
2、ght 2011, Ford Global Technologies, LLC Page 1 of 3 STEEL, ZINC/NICKEL PLATED, IMMERSION COATED, WSS-M1A343-A2 HEXAVALENT CHROMIUM FREE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a low carbon steel sheet coated on both sides with an electrolytic zinc/nickel
3、alloy. The coated sheet is formed into a component, which then goes through a pretreatment and an immersion organic top coating to produce a duplex system. 2. APPLICATION This specification was released originally for material used for fuel filler pipes requiring both additional corrosion protection
4、 and resistance to alcohol fuel blends. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Productio
5、n Materials (WSS-M99P1111-A). 3.2 BASE MATERIAL The base material shall conform to WSD-M1A333-A2, coated to WSS-M1P94-A 30N30N-EL. 3.3 PRETREATMENT A pretreatment shall be used to increase the adhesion and durability of the organic top coating by providing a clean, grease free, corrosion inhibiting
6、bond between the base material and finish. The specification of the pretreatment system (including cleaning requirements, pretreatment type and coating weight) is to be determined on initial qualification of materials and process. A control plan with detailed material description and process paramet
7、ers is required for approval submission. Once the system is approved, any further changes will need to be re-submitted to the appropriate Ford Materials Engineer for evaluation and approval. Coating weights should be measured on samples prior to immersion coating and should be tested using x-ray spe
8、ctroscopy, atomic absorption or inductive coupled plasma testing apparatus. A chromium-free pretreatment is preferable, but at a minimum the pretreatment shall be free of hexavalent chromium. 3.4 ORGANIC TOP COATING 3.4.1 System Process The coating shall be applied using an immersion process. All su
9、rfaces of material to be coated must be free from oil, grease, rust, and any other foreign material. ENGINEERING MATERIAL SPECIFICATION WSS-M1A343-A2 Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 2 of 3 3.4.2 Final Hardness (ASTM D 3363) Pencil, min 8H Remove any
10、 additional coatings, such as dry metal forming lubricants, prior to hardness testing. 3.4.3 Coating Thickness, micrometers 20.3 +/- 5.1 Any suitable method may be used to measure coating thickness but the preferred method is a permascope. A minimum of nine measurements are to be taken per pipe, thr
11、ee in the funnel/bowl area, three in the midsection and three near the end of the pipe, unless otherwise specified on the Engineering Drawing. Each individual measurement must fall within the specified range. 3.4.4 Composition The coating shall be a phenolic modified epoxy material, free of hexavale
12、nt chromium. 3.4.5 Appearance The coating shall be baked to a uniform film, showing no flow lines, pinholes, craters, flaking, cracking, peeling or blistering. Critical sealing surfaces with additional surface criteria (i.e. surface roughness) are to be noted on the Engineering Drawing. 3.4.6 Color
13、Black or as specified on Engineering Drawing. 3.4.7 Adhesion Grade 1 or better (FLTM BI 106-01 Method B) 3.4.8 Proving Ground Corrosion Test (CETP 00.00-R-311 or CETP 00.00-R-339) For initial approval only. Fuel components manufactured from this material must withstand 100 cycles (or equivalent) min
14、imum without perforation. 3.4.9 Fuel Resistance No softening or peeling. (FLTM AZ 105-02, FLTM BZ 105-03) Some allowable rust Initial source approval only. The paint film shall not soften, peel, or show any signs of defect when soaked in fuels described in FLTM AZ 105-02. Allowable rust based on tes
15、ting with control samples will be specified by the Materials Engineering activity. 3.4.10 Surface Resistance, max 10E6 ohms ASTM D 4496, (ASTM D 257 tube specimen) Measurement of the finished coated product shall be tested to ensure adequate conductivity to discharge any static electricity that may
16、be generated. ENGINEERING MATERIAL SPECIFICATION WSS-M1A343-A2 Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 3 of 3 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification.
17、4.1 ADDITIONAL COATING Additional coatings, such as dry metal forming lubricants may be required. These materials will be agreed upon between the coating supplier and the component manufacturer. 4.2 INITIAL SUPPLIER APPROVAL For initial approval, the supplier must furnish the following information. A plan detailing how each requirement of para 3 will be controlled on a continuing production basis. Test results from a typical production sample for the requirements outlined in para 3. Upon approval, the material will be added to the Engineering Material Approved Source List.
