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1、WP 3948-a Page 1 of 3ENGINEERING MATERIAL SPECIFICATIONMaterial Name Specification NumberPAINT PERFORMANCE, PRIMED PARTS, 240 h SALT SPRAY, EXTERIOR WSK-M2P149-A1PAINT PERFORMANCE, PRIMED PARTS, 480 h SALT SPRAY, EXTERIOR WSK-M2P149-A21. SCOPEThese specifications define the performance requirements

2、for primed partswith excellent corrosion resistance.2. APPLICATIONThese specifications were released originally to define paint performancefor electrocoated spare parts which later are partially painted in bodycolour at dealers location.3. REQUIREMENTS3.1 STATISTICAL PROCESSSuppliers must conform to

3、 the requirements of Ford Quality SystemStandard Q-101. A mutually acceptable Control Plan as describedtherein is required for material/source approval. Appropriatestatistical tools must be used to analyze process/product data so thatvariation in the final product is continuously reduced.3.2 CONDITI

4、ONINGAll tests according to this specification shall be performed in acontrolled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidityif not otherwise specified.3.3 SYSTEM COMPONENTS3.3.1 SubstrateCold or hot rolled steel, iron or zinc castings or aluminiumetc., as specified on Engineering Drawi

5、ng.When it is not feasible to test actual parts, test panels maybe substituted. Test panels shall be processed underproduction conditions, analogous to actual parts.3.3.2 CleaningThe surface to be coated shall be cleaned by an acceptableprocess to remove residues, finger prints, rust and dirt.Parts

6、may be degreased by hand or vapour, but the recommendedmethod is automatic degreasing, incorporated in the followingphosphating/electrocoat process.Date Release No. Released1993 09 01 EP00E01025825000 Complete revise K Wolters1990 02 01 C01031532 Released C E Herriott concurred J SchultNOT TO BE USE

7、D FOR NEW DESIGN2016 N Status Replaced by WSS-M2P182-A system 1 G. Weber, NAWP 3948-b Page 2 of 3ENGINEERING MATERIAL SPECIFICATIONWSK-M2P149-A1/A23.3.3 PretreatmentRec ommended pretreatments are zinc phosphate coating perWSK-M3P1-C for cold rolled steel, pre-coated, electroplatedzinc o r zinc alloy

8、 coated steel, zinc die castings orChr omium oxide coating per WSK-M6P2-B for aluminium. Ifsteel and aluminum parts are processed concurrently, zincphosphate coating per WSK-M3P1-C shall be used.De viating pretreatments may be accepted if the final partmeets all requirements of this specification.3.

9、3.4 Cathodic ElectrocoatFord Engineering approved current production material,application and film thickness as required in the relevantmaterial specification.3.3.5 AgeingTest panels or test specimens prepared for investigationsaccor ding to this specification must be aged for at least72 hours at 23

10、 +/- 2 C or 16 hours at 45 +/- 1 C prior totesting.3.3.6 Production Paint RepairRepai red areas must meet the requirements of thisspecification. All repair materials and processes used mustbe approved by the affected Product Engineering Office.Maximum film thickness for repaired parts will be specif

11、iedin the mutually agreed control plan.3.4 COLOUR Black or as specified(FLTM BI 109-01) on Engineering Drawing3.5 RESISTANCE PROPERTIES3.5.1 Adhesion Grade 0(FLTM BI 106-01, Method B)3.5.2 Water Resistance 240 h(FLTM BI 104-01)No blistering, softening, dulling, or loss of adhesion.Slight colour chan

12、ge may be accepted.3.5.3 Salt Spray Resistance, min(FLTM BI 103-01)WSK-M2P149-A1 240 hWSK-M2P149-A2 480 hNo blistering, no rusting or loss of adhesion more than 3 mmfrom the scribed line.ENGINEERING MATERIAL SPECIFICATIONWSK-M2P149-A1/A2WP 3948-b Page 3 of 3 3.6 INITIAL HARDNESSThe finis h shall be

13、sufficiently cured at the time of packing towithstand normal handling and shipping without damage.3.7 COMPATIBILITYAfter application of prim er surfacer and topcoat, finished parts forex terior application shall meet all requirements of performancespecification WSK-M2P136-A.3.8 ADDITIONAL REQUIREMEN

14、TSSpecific requirements for material and/or manufact ured parts shall bespecified on the Engineering drawing, Engineering parts specificationand/or performance specifications. All critical areas with respectto thes e properties shall be clearly designated on the Engineeringdrawing.3.9 SUPPLIERS RESP

15、ONSIBILITYAll mat erials supplied to this specification must be equivalent inall characteristics to the material upon which approval wasoriginally granted.Prior to making any change in the properties, composition,cons truction, color, processing or labeling of the materialor iginally approved under

16、this specification, whether or not suchchan ges affect the materials ability to meet the specificationrequ irements, the Supplier shall notify Purchasing, Toxicology andthe affected Materials Engineering activity of the proposed changesand obt ain the written approval of the Materials Engineeringact

17、ivity. Test data, tes t samples and a new code identification areto be submitted with the request.Substance restrictions im posed by law, regulations or Ford, apply tothe materials addressed by this document. The restrictions aredefined in Engineering Material Specification WSS-M99P9999-A1.4. APPROV

18、AL OF MATERIALSThis specification is int ended to define the performance and/or propertiesof finished parts or systems of combined materials. An EngineeringMaterial Approved Source listing is not applicable for this specification.Produ ct Engineering materials referenced in this document and/or theaffected engineering draw ing which require prior Engineering approval, areshown in the Engineering Material Approved Source List under thespecification cited.