1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions Rev. 1 2010 05 25 Revised See Summary of Revisions A. Wedepohl, NA 2009 05 21 Activated Replaces WSS-M2P177-B1/B2 A. Wedepohl, NA Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 1 of 4 PAINT PERFORMANCE, META
2、L SUBSTRATES, WSS-M2P177-C1 LOW VISIBILITY, 4 WEEK RESISTANCE PAINT PERFORMANCE, METAL SUBSTRATES, WSS-M2P177-C2 MODERATE VISIBILITY, 6 WEEK RESISTANCE PAINT PERFORMANCE, METAL SUBSTRATES, WSS-M2P177-C3 HIGH VISIBILITY, 9 WEEK RESISTANCE 1. SCOPE These specifications define the minimum performance r
3、equirements for a protective finish for chassis and engine components. These parts are generally not top coated at the assembly plant. 2. APPLICATION These specifications were originally released for chassis and engine components that do not experience continuous operating temperatures above 121 C (
4、250 F) and which receive a minimal amount of direct ultraviolet exposure. Where temperature exceeds 121 C, a high temperature paint system should be considered. In applications where prolonged exposure to UV light is expected, epoxy resins should not be used. These specifications are typically used
5、for epoxy based e-coat or powder coatings. These specifications are not intended to limit the coating to any specific material type or process, but instead define the performance of the system. Components typically use the following performance levels. WSS-M2P177-C1 Knuckles, non-visible castings, e
6、ngine block WSS-M2P177-C2 Stabilizer bars, control arms, brackets, shocks, sub-frames, frames, bumper beams WSS-M2P177-C3 Tow hooks, trailer hitches, fuel system components 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Co
7、mpanys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 SUBSTRATE PROPERTIES 3.2.1 Substrate As specified on the Engineering Drawing. Except for Chip Resistance, all requirements of these specifications must be validated with actual production intent components. ENGINEERING MATER
8、IAL SPECIFICATIONWSS-M2P177-C1/C2/C3 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 4 3.2.2 Metal Preparation The surface to be coated must be free from oil, alkaline residues, rust, dirt, moisture and other foreign materials. A preliminary shot blasting or p
9、ickling operation is required on castings, forgings, and scaled steel. A zinc phosphate pretreatment per WSS-M3P36-A1 is recommended for electrocoated or powder coated components. 3.3 FILM PROPERTIES 3.3.1 Color Black or as specified on the engineering drawing. 3.3.2 Initial Hardness The finish shal
10、l be sufficiently cured at the time of packing to withstand normal handling and shipping without damage. 3.3.3 Adhesion (ASTM D3359) Method A, X-cut Tape Test 4A or better Method B, Cross-Cut Tape Test 4B or better Available surface area and contour of the component determines which method to use. I
11、f both methods are suitable, then Method B is preferred. When using Method A, a minimum of three X-cuts per part is required to increase sampling area. 3.3.4 Film Thickness, min (FLTM BI 117-01, ASTM B 487) Coating thickness must be sufficient to meet all the performance requirements of these specif
12、ications. Minimum coating thickness must be listed on the print and should be based on production intent parts. The type of coating shall also be referenced on the print. Example: E-coat per WSS-M2P177-C1, 20 m min 3.4 RESISTANCE PROPERTIES 3.4.1 Chip Resistance 5BA max (SAE J400, Method C, Method I
13、I) (less than 49 chips Chip size 3 m) Test shall be conducted on production intent components or on panels. The test panel must have the same substrate i.e. cold rolled/hot rolled steel, cast iron, wrought/cast aluminum and be painted on the same system as the production intent component. or (FLTM B
14、I 157-06) 6 min ENGINEERING MATERIAL SPECIFICATIONWSS-M2P177-C1/C2/C3 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 3 of 4 3.4.2 Laboratory Accelerated Cyclic Corrosion Test (CETP 00.00-L-467, ASTM D610) WSS-M2P177-C1 4weeks Grade 6 or better WSS-M2P177-C2 6 week
15、s Grade 6 or better WSS-M2P177-C3 9 weeks Grade 6 or better The part must be rated no worse than Grade 6 as defined by ASTM D 610. Parts with sharp edges, recessed areas, rough surfaces, or welds may have reduced corrosion resistance at these locations. Final judgment of corrosion performance should
16、 be based on visibility of the parts as observed from the rear, engine compartment, or in the wheel wells of the vehicle as described by in Total Vehicle Corrosion Resistance requirement 18-0040. 3.4.3 Water Resistance, min (FLTM BI 104-01, ASTM D714) Immerse samples 240 hours. Allow paint film to r
17、ecover 1 h at room temperature after immersion before evaluating. No softening, rust, dulling, color change and/or loss of adhesion. Blistering shall not exceed size 8, few per ASTM D 714. Adhesion shall meet the requirements in sec. 3.3.3 3.4.4 Fluid Resistance (FLTM BI 168-01, Method A Gasoline, D
18、iesel, Coolant, Engine Oil) The finish shall not blister or show more than slight softening or dulling. Adhesion shall meet the requirements in sec. 3.3.3. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specificati
19、ons. 4.1 SURFACE PREPARATION For initial DV or PV evaluations, descaled parts may be rated according to ASTM D 2200 method B. The SSPC BSP rating achieved on the design intent parts should appear in the control plan to indicate the level of cleaning. Example: Descale cleaning level SSPC BSP 10 or be
20、tter. 4.2 GLOSS (FLTM BI 110-01) The recommended gloss level for chassis components visible with “wheels on ground“ is 30 to 80 at 60 angle. ENGINEERING MATERIAL SPECIFICATIONWSS-M2P177-C1/C2/C3 Printed copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 4 of 4 4.3 RECOMMENDED
21、 TESTING REQUIREMENTS FOR DESIGN VALIDATION, PRODUCTION VALIDATION, AND SREA. Paint performance is a function of material selection, surface preparation, and paint application. For established coatings and coating lines, this may permit a reduced test schedule to validate compliance to this specific
22、ation. Use the following table to determine the recommend test plan depending on the situation. Table 1 New Coating Material Established Coating All Applicators New Paint Line (No Ford History) Existing Paint Line (Applicator) Test Requirements Example A Existing part Example B New Part for a differ
23、ent application Example C Switching Known Paints on same part Example D New Part/Same materials Example E Process Change Example F 3.3.3 Adhesion X X X X X 3.3.4 Film Thickness X X X X X 3.4.1 Chip Resistance X X X1 3.4.2 Laboratory Accelerated Cyclic Corrosion X X X13.4.3 Water Resistance X X X X 3
24、.4.4 Fluid Resistance X Contact Materials EngineeringExample A. A new coating is developed by a paint manufacture for automotive applications Example B. Painter goes out of business. New painter uses the same paint, but has never painted parts for Ford. Example C. Tier 2 painter for stabilizer bars
25、is asked to coat brackets on the same paint line. Example D. Sub frame supplier is switching from standard e-coat to high edge e-coat on their in-house paint line. Both e-coats are widely used at Ford. Example E. Control arm supplier is painting the first run of PPAP parts for the new model program
26、on the paint line that supports current model. Example F. The level of testing is highly dependant on what is changing. Contact Materials Engineering. 1Potential use of surrogate data Note: This specification cannot prove out parts or coatings that involve changes in vehicle environment such as incr
27、eased stone chipping or increased temperature. These changes may require vehicle testing, consult SDS/ARL requirements. 5. SUMMARY OF REVISIONS 2010 05 25 Replaced DV PV test table with recommended test table with examples. Cyclic corrosion changed from 3 to 4 weeks and 12 to 9 weeks for correlation to R-343.
