1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2011 12 07 N Status No replacement named N. Benipal, NA 2005 07 29 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.9 and 4 1992 05 01 Released NC00E10079759022 L. Mastrofrancesco Controlled document at www.MATS Copyright 2011, Ford Glob
2、al Technologies, LLC Page 1 of 3 PAINT, POWDERED, THERMOSETTING POLYESTER WSA-M70J9-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a thermosetting polyester powder coating. 2. APPLICATION This specification was released originally as a coating for controlling
3、and reducing collapse load efforts for steering column tubes. This material will be used as an alternate coating to ESB-M6J27-C. 3. REQUIREMENTS 3.4 COMPOSITION 3.4.1 Specific Composition When it is necessary to obtain specific data regarding powder coating formulations, suppliers will furnish such
4、data on request. 3.4.2 Vehicle Solids The vehicle solids shall be polyester resins modified with suitable cross linking, catalytic, and flow control agents as necessary to meet the requirements of 3.5 - 3.7. 3.4.3 Pigment The pigment portion shall contain the necessary corrosion inhibiting pigments
5、and/or flattening agents to meet the requirements of para 3.5 - 3.7. 3.5 PHYSICAL PROPERTIES 3.5.1 Shelf Stability The powder must be capable of satisfactory application without conditioning after 6 months storage at 20 +/- 5 C. 3.5.2 Mean Particle Size 25 - 31 microns Test Method: Laser Diffraction
6、 Method. ENGINEERING MATERIAL SPECIFICATION WSA-M70J9-A Copyright 2011, Ford Global Technologies, LLC Page 2 of 3 3.6 PREPARATION OF TEST PANELS Panels shall be prepared as described by ASTM D 3451 with the following specific requirements: The coating shall be tested over CRLC steel test panels unle
7、ss otherwise agreed upon by the supplier and Product Engineering. All substrates are to be zinc phosphated per WSK-M3P1-C or iron phosphated per ESB-M3P2-A prior to coating. The candidate powder shall be electrostatically applied and cured as follows: 3.6.1 Bake Schedule, min 11 minutes at 200 C met
8、al temperature 3.6.2 Cured Film Thickness, min 75 micrometers (FLTM BI 117-01) 3.7 FILM PROPERTIES 3.7.1 Color As specified on (FLTM BI 109-01) engineering drawing 3.7.2 Cure Test No softening or color transfer Test Method: Using a cloth saturated with methyl ethyl ketone, rub briskly over the surfa
9、ce of the coating ten times in the same area. 3.7.3 Coating to Substrate Adhesion The coating shall show no peeling from the substrate in the following conditions: 3.7.3.1 As received. 3.7.3.2 After resistance testing per para 3.7.4 - 3.7.6. Test Method: With a sharp blade or knife make two parallel
10、 cuts through the coating 1.5 - 3.0 mm apart and 25 - 50 mm long. Make a similar cut across these at one end and starting at the cross cut, slit the coating away from the substrate between the parallel cuts for a distance of approximately 6.4 mm. Grasp the free film end between the knife blade and f
11、inger and attempt to pull the film from the substrate. Satisfactory adhesion is indicated when coating breaks while resisting removal of stripping from the substrate. 3.7.4 Salt Spray 240 h (FLTM BI 103-01) No failure in the specified time by blistering or rusting, or more than 3 mm rust or blister
12、creepage from a line scribed to bare metal. ENGINEERING MATERIAL SPECIFICATION WSA-M70J9-A Copyright 2011, Ford Global Technologies, LLC Page 3 of 3 3.7.5 Water Immersion 240 h (FLTM BI 104-01) The coating shall show no evidence of cracking, shrinking, crazing, blistering, loss of adhesion or substr
13、ate corrosion in the specified time. Luster and appearance change shall be no greater than the approved standard. 3.7.6 Thermal Shock Resistance The coating shall show no evidence of deterioration after being tested. Test Method: Allow three panels to reach 150 C in a mechanical convection oven, rem
14、ove and quench in ice water, dry and immerse in an alcohol/dry ice solution at -75 C. Repeat procedure for five cycles. 3.7.7 Abrasion Resistance, max 0.5 g (FLTM BN 108-04), H-18 Wheel, 1000 g load, 500 cycles) 3.8 EXPLOSION HAZARD These materials should be used in a closed system specifically designed for their use because of the possibility of dust explosion present in powdered materials.
