1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 08 28 Revised Para 3.0 inserted; Para 3.2.2 & 3.3 & 4 deleted 1983 01 25 Released TM2-01-3-0 Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 2 PHOSPHATE BASE, BONDED PTFE RESIN COATING STEEL ESL-M3
2、P30-A 1. SCOPE This specification defines the performance requirements for steel fasteners, phosphated and coated with a bonded fluorocarbon (PTFE) resin. The one-component resin bonded PTFE is cured between 149 to 204 C. The PTFE resin offers lower coefficient of friction for bolt drive torque. 2.
3、APPLICATION 2.1 USE This specification was released originally for moderate corrosion resistance of steel fasteners for automotive purposes. 2.2 QUALITY The quality required shall be obtained by the best commerical practice to consistently meet the requirements of this specification. Complete phosph
4、ate coverage is expected on properly cleaned parts, prior to the bonding of a uniform PTFE resin coating and solvent type oil. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Ma
5、terials (WSS-M99P1111-A). 3.1 FINISH 3.1.1 Phosphate Any type phosphate which meets the other requirements of this specification. 3.1.1.1 Coating weight, min 600 mg/ft2(6.5 g/m2) (FLTM AQ 101-01 or AQ 101-02) on all surfaces. 3.1.1.2 Adhesion There shall be no chipping away of the phosphate coating
6、from the metal when the coating is tested by scratching with a knife blade held at an angle of 90 to the surface. 3.1.1.3 Visual Examination Phosphate coated parts are subject to surface inspection for such imperfections as an excessively coarse phosphate structure and incompletely phosphated area.
7、ENGINEERING MATERIAL SPECIFICATIONESL-M3P30-APrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 2 3.1.2 Resin Bonded PTFE 3.1.2.1 Film Thickness 0.0003 - 0.0012 in (8 - 30 m) 3.1.2.2 Finish The coating shall be free of cracks, blisters and foreign materials, and
8、 shall be continuous homogeneous coating, with good adhesion. 3.1.3 Oil Sealer A water base inhibitor shall be applied as a sealer as the final processing step. 3.1.3.1 Oiliness Parts need not be completely dry to the touch, however, parts shall not be excessively oily. 3.2 FINISH PART REQUIREMENTS
9、3.2.1 Color Black, or as specified on the engineering drawing. 3.2.3 Salt Spray Resistance, min 48 h (ASTM B 117) One rust or corrosion spot on the significant surface area is acceptable, provided such spot is not larger than 1/16 in (1.6 mm) in diameter. On other surfaces, rust or corrosion shall n
10、ot exceed 2% of the areas. 3.2.4 Gasoline Immersion 72 h (ASTM D 471) Finished metal parts shall show no evidence of coating failure or loss of adhesion after immersion in reference Fuel “B“ at room temperature. 3.2.5 Oil Immersion 72 h (ASTM D 471) Finished parts shall show no evidence of coating failure or loss of adhesion after immersion in ASTM Oil #3 at room temperature.
