1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2011 02 25 No replacement. No longer in use. G. Weber, NAN-STATUS 2000 07 11 Editorial no technical change APC1998 04 02 Activated B. CardwellPage 1 of 4 CORROSION PROTECTIVE COATING, FLUOROCARBON, WSS-M21P3
2、4-A RESIN BONDED NOT TO BE USED FOR NEW DESIGN 1. SCOPE The coating defined by this specification is a resin bonded fluorocarbon which possesses excellent adhesion and imparts corrosion resistance to steel substrates. 2. APPLICATION This specification was originally released to provide corrosion res
3、istance to steel components such as throttle body shafts. This specification was not intended for coatings which require specific friction or wear characteristics. 3. REQUIREMENTS 3.1 QUALITY SYSTEM REQUIREMENTS Material suppliers and part producers must conform to Quality System Requirements, QS-90
4、00. Material specification requirements are to be used for initial qualification of materials. A Control Plan for ongoing production verification is required. This plan must be reviewed and approved by the relevant Ford Materials activity and/or Ford Supplier Technical Assistance (STA) prior to prod
5、uction parts submission. Appropriate statistical tools must be used to analyze process/product data and assure consistent processing of the materials. Part producers using this material in their products, must use Ford approved materials and must conform to a process control plan which has been appr
6、oved by STA and/or the relevant Materials Activity. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermograms established for initial approval
7、 shall constitute the reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. ENGINEERING MATERIAL SPECIFICATION WSS-M21P34-A Page 2 of 4
8、3.3 APPLICATION TECHNIQUE The coatings shall be applied by spray techniques based on processes and materials originally approved by the affected product engineering department. Process sheet and substrate treatment to be on file at the approving materials activity. 3.4 APPEARANCE The coating shall b
9、e uniform in color and coverage. It shall be free of obvious imperfections as determined by unaided visual examination. The coatings shall be smooth to the touch and also free of cracks when observed at a magnification of 10X. 3.5 FILM THICKNESS The min film thickness shall be adequate to pass all p
10、erformance, engineering, and functional requirements. However, finished part dimensions are to be specified on engineering drawings and measured by non-contact methods to be specified by the product engineering office. 3.6 ADHESION (FLTM BI 106-01, Method A; use a 13 mm scratch and additionally test
11、 using tape and examination from Method B) Coating must not flake, chip, or transfer film to tape. 3.7 SOLVENT RESISTANCE No softening of the coating or evidence of color removal or transfer when a cloth dipped in MEK is rubbed twice over the surface of the coating. 3.8 CORROSION RESISTANCE (ASTM B
12、117) 3.8.1 Test Panels Tests shall be conducted on coated panels of low carbon steel (SAE J403 1006 - 1010). Salt Spray, h 500 Panels must meet a rating of no lower than 7 per ASTM D 1654, Procedure B. ENGINEERING MATERIAL SPECIFICATION WSS-M21P34-A Page 3 of 4 3.8.2 Finished Parts Salt Spray, h 200
13、 (Initial PPAP) 96 (Lot Certification) Parts must meet a rating of no lower than 7 per ASTM D 1654, Procedure B. The above requirements for salt spray apply only to significant surfaces. The specified corrosion resistance is required only on such surfaces of parts other than threads or holes, as can
14、 be touched by a sphere 13 mm in diameter, unless otherwise noted on drawings. On other surfaces such as those of holes, recesses, threads, etc., where a controlled deposit can not be obtained under normal coating conditions, the above requirements do not apply. Acceptance or rejection of parts subm
15、itted to this specification will be based on salt spray results on significant surfaces. 3.9 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or performance specification. All criti
16、cal areas with respect to these properties shall be clearly designated on the engineering drawing. Candidate materials shall successfully complete the following testing prior to approval to this specification. 3.9.1 Production Shop Trial 3.9.2 Component/Module Life Cycle Testing (As specified by the
17、 responsible design activity) 3.10 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. ENGINEERING MATERIAL SPECIFICATION WSS-M21P34-A Page 4 of 4 Prior to making any change in the
18、 properties, composition, construction, color, processing or labeling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Mater
19、ials Engineering activity of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification are to be submitted with the request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addr
20、essed by this document. The regulations are defined in Engineering Materials Specification WSS-M99P9999-A1. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification 4.1 OPERATING TEMPERATURE, C Continuous 149 Intermittent 177
