1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 0 2015 05 08 Released G. Weber, NA Controlled document at www.MATS Copyright 2015, Ford Global Technologies, LLC Page 1 of 4 FASTENER FINISH, ZINC PHOSPHATE AND OIL WSS-M3P39-A1 1. SCOPE The material defined by this specification is a mi
2、crocrystalline zinc phosphate coating and lubricating oil over steel substrates intended to provide improved torque-tension performance and to prevent rust formation during shipment and short-term storage. 2. APPLICATION This finish is intended for internal powertrain fasteners which require excelle
3、nt torque-tension performance and resistance to galling during assembly. The finish is not suitable for use on fasteners exposed to the environment whether underhood, underbody, or inside the passenger compartment. 2.1. SERVICE APPLICATION 2.1.1 The following critical temperatures should be recogniz
4、ed when using these products. - Torque tension performance degrades above 80 C. - Fastener removal may be difficult when joint temperature has exceeded 600C 2.1.2 Fasteners coated to this specification are not suitable for electrical grounding applications. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS
5、FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 The Approved Source List for this specification will list only the approved lubricating oils (including thread-rolling lubricants) and not
6、the phosphate coatings. Any phosphate coating meeting the requirements below may be used on parts coated to this specification, but the chosen lubricant must appear on the Approved Source List. See approval requirements in Section 4.2. 3.2 COATING APPEARANCE 3.2.1 The finished coating will be light
7、to dark gray. 3.2.2 The phosphate coating shall cover the metal surfaces evenly and shall not exhibit any white patches, corrosion products or bare spots. 3.2.3 The oil must not excessively pool in the bottom of packaging. ENGINEERING MATERIAL SPECIFICATION WSS-M3P39-A1 Copyright 2015, Ford Global T
8、echnologies, LLC Page 2 of 4 3.3 COATING APPLICATION 3.3.1 Applicators shall follow material supplier procedures and recommendations for chemical usage, equipment, analysis, and processing. Applicators must have documentation to show that procedures and recommendations are being followed. 3.3.2 Prio
9、r to coating, the substrate shall be free of oil, dirt, oxide scale, and similar foreign materials. 3.3.3 When parts require cleaning prior to phosphate coating, the use of strong acids or alkalis for cleaning should be minimized and have no detrimental effect on the substrate. Approved cleaning met
10、hods are listed in the tables below. Blanks Prior to Thread Rolling Specified Hardness (Surface and/or Core) Mechanical Cleaning Alkaline Bath Cleaning Inhibited Acid Bath Cleaning 390 HV (39 HRC) Preferred Acceptable Acceptable 390 HV (39 HRC) Preferred Acceptable Not Allowed Threaded Parts Specifi
11、ed Hardness (Surface and/or Core) Mechanical Cleaning Alkaline Bath Cleaning Inhibited Acid Bath Cleaning 390 HV (39 HRC) Acceptable Preferred Acceptable 390 HV (39 HRC) Acceptable Preferred Not Allowed 3.3.4 The applicator shall follow the phosphate suppliers recommendations for maximum drying temp
12、erature. 3.4 EMBRITTLEMENT AVOIDANCE Parts coated to this specification shall meet the requirements of WSS-M99A3-A to avoid the detrimental effects of hydrogen embrittlement or other factors which result in part brittleness. WSS-M99A3-A requires phosphated parts to be baked at a minimum of 110 C for
13、 1 hour within four hours of coating, or the parts shall not be used for 48 hours after coating. 3.5 COATING PROPERTIES 3.5.1 Zinc Phosphate Coating 3.5.1.1 Coating Weight 2-7 g/m2 (ISO 3892, except repeat the strip/rinse/weigh process until weight stabilizes) 3.5.1.2 Coating Thickness (ISO 3497) Fa
14、stener under-head and shank regions 2- 6 m ENGINEERING MATERIAL SPECIFICATION WSS-M3P39-A1 Copyright 2015, Ford Global Technologies, LLC Page 3 of 4 3.5.1.3 Crystal Size (Scanning electron microscope at 1000X magnification) The mean crystal size shall be 4-8 m with a preferred maximum crystal size o
15、f 10 m. Isolated crystals up to 15 m are permitted, provided torque-tension performance is not degraded. 3.5.2 Lubricating Oil 3.5.2.1. See the Ford Engineering Material Approved Source List (ASL) for approved oils. 3.5.2.2 Oil must cover the entire part in sufficient quantity to meet torque tension
16、 and corrosion performance requirements. 3.5.2.3 When fastener threads are rolled after phosphate coating it is permissible to avoid a separate oil application by allowing the thread rolling lubricant to may remain on the threads provided it meets the torque-tension and corrosion performance require
17、ments. Approved thread rolling lubricants will be listed in the Ford ASL. 3.5.3 Torque-Tension Performance (Ford WZ102, unplated test nut, surrogate bolt friction 0.11 0.03) The friction measured on actual parts will vary based on variations in fastener geometry and under-head flatness. Calculate fr
18、iction, (tot), at 75% of proof load for standard property class bolts and 75% of yield rating for yield rated bolts. Mean friction shall be established at PPAP and shall fall within the range of mean friction specified below. Subsequent production lots shall fall within the range specified below of
19、the mean that was established at PPAP. Mean friction, (tot) (as established at PPAP) 0.11 0.14 Range around mean (subsequent production) 0.03 3.5.4 Corrosion Testing (SAE/USCAR-1 except section 4.1 do not wash parts before testing) Threaded fasteners coated to this specification shall be tested and
20、evaluated in accordance with SAE/USCAR-1. Before testing, suspend the test pieces for at least 24 h at a temperature of 23 5C and a relative humidity not exceeding 65%, in a dust and draft-free environment, to allow excess oil to drip off and the solvents to evaporate. Ferrous corrosion 8 hours 4. G
21、ENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. Contact for questions concerning Engineering Material Specifications. 4.1 FORD WORLDWIDE FASTENER FINISH When used for Worldwide Standard Parts, the World
22、wide Fastener Finish Suffix as defined in Worldwide Fastener Standard WX100 shall be specified as S452. ENGINEERING MATERIAL SPECIFICATION WSS-M3P39-A1 Copyright 2015, Ford Global Technologies, LLC Page 4 of 4 4.2 RECOMMENDED TESTING REQUIREMENTS FOR DESIGN VALIDATION, PRODUCTION VALIDATION, AND SRE
23、A. Coating performance is a function of material selection, surface preparation, and coating application. For established coatings and coating lines, this may permit a reduced test schedule to validate compliance to this specification. Use Table 1 below to determine the recommend test plan depending
24、 on the situation. This specification cannot prove out parts or coatings that involve changes in vehicle environment such as increased stone chipping or increased temperature. These changes may require vehicle testing, consult SDS/ARL requirements. TABLE 1 New Lubricant ASL Approval New Part Initial
25、 PPAP PPAP for Existing Part Change Production Control Process Change Change Description Lubricant Phosphate Process Location A B C D E F G Test Requirement 3.5.1.1 Coating Weight X X X1 X X 1/lot1 Contact Fastener Engineering 3.5.1.2 Coating Thickness X X X1 X X 3.5.1.3 Crystal Size X X X1 X X 3.5.
26、3 Torque Tension Performance X X X X X 1/daily1 3.5.4 Corrosion Testing X X X X X 1/lot 1 Potential use of surrogate data Comments A: Initial approval of a new lubricant to the Approved Source List B: Required validation for initial PPAP submission. C: Change to a different lubricant already on the ASL D: No change of lubricant from initial part PPAP E: Change of applicator or change of coating line at an applicator F: Required testing to demonstrate ongoing production control G: Level of testing is dependent on degree of change
