1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 08 29 Revised Para 3.0 inserted; Para 3.6 & 4 deleted 1995 05 17 Revised Para 3.3.1.2 1990 02 01 C01031532 Released Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 3 PHOSPHATE COATING, ZINC WSK-M3P
2、1-C 1. SCOPE This specification defines the performance requirements of a zinc phosphate coating on automotive parts which are subsequently painted. 2. APPLICATION This specification was released originally for phosphate coatings used for iron, steel, zinc or zinc alloy coated steel or zinc parts wh
3、ere maximum paint adhesion and corrosion resistance are required. It is to be used for aluminum only when processed concurrently with steel parts. This use is subject to the tolerance limit of the specific phosphate process for aluminum, provided that both aluminum and steel parts processed concurre
4、ntly, meet all requirements of this specification. The coating provides a clean grease-free surface for painting, improves adhesion of the paint film and inhibits spread of corrosion when the paint film is broken. Substrate limitations of zinc phosphate coatings approved under this specification are
5、 as follows: Type I Iron and Steel Type II Iron, Steel and Zinc or Zinc Alloy Coated Steel Type III Iron, Steel, Zinc or Zinc Alloy Coated Steel and Aluminum 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard
6、 Requirements For Production Materials (WSS-M99P1111-A). 3.3 PHYSICAL PROPERTIES 3.3.1 Coating Weight * (FLTM AQ 101-01 or 101-02) The coating weights as defined below must only be used with the materials described. Note: When phosphate solutions with high Nickel or Manganese contents are in use, th
7、e chromic acid test (FLTM AQ 101-01) should be used. 3.3.1.1 Coating Weights for Dip Systems Cold Rolled Steel 1.8 - 3.3 g/m2Zinc Coated Steel 2.8 - 4.0 g/m2ENGINEERING MATERIAL SPECIFICATIONWSK-M3P1-CPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 3 3.3.1.2
8、Coating Weight for Spray Systems Cold Rolled Steel 1.5 - 3.0 g/m2Zinc Coated Steel 2.5 - 4.0 g/m2Hot Rolled Steel 1.5 - 3.0 g/m2* Coating weight requirements are not applicable to aluminum. 3.4 PREPARATION OF TEST PANELS In order to eliminate variables in testing production parts, tests shall be con
9、ducted on standard test panels prepared in accordance with Ford Manufacturing Standard U-MA001-8001 and relevant precoated steel substrates in current production quality according to para. 3.3.1. Sufficient panels must be prepared representing both high and low coating weight deposition within each
10、described range. 3.4.1 Phosphate Coat Process panels through complete cycle of phosphate coating system under test, including cleaning, crystal refinement, phosphating, passivation, deionized water final rinse and drying. Panels processed to this point shall be used for coating weight determination,
11、 para. 3.3.1. Panels for paint adhesion and resistance tests shall be further processed as indicated in para. 3.4.2. 3.4.2 Paint System Apply paint system as used in production with electrocoat primer, primer surfacer and white top coat. Materials shall be applied, baked and aged in accordance with
12、individual material specifications. 3.5 RESISTANCE PROPERTIES Note: If single side precoated steel is used in production, perform resistance tests on both sides of test panels which have been painted according 3.4.2 before testing. 3.5.1 Adhesion Rating 0 (FLTM BI 106-01, Method B) 3.5.2 Stone Chip
13、Resistance, max. Rating 3 (FLTM BI 157-04) 3.5.3 Water Immersion Test, min. 240 h (FLTM BI 104-01) No failure of panel prepared as in para 3.4 at 32 +/- 1 C. Failure shall be defined as blisters, permanent change of appearance or loss of adhesion. 3.5.4 Salt Spray Test, min. 480 h (FLTM BI 103-01) T
14、est to be performed on iron and steel substrates only. Scribe panels after painting. No failure of panel prepared as in para 3.4. Failure shall be defined as blisters, rust or loss of adhesion exceeding 3 mm from scribe line. ENGINEERING MATERIAL SPECIFICATIONWSK-M3P1-CPrinted copies are uncontrolle
15、d Copyright 2003, Ford Global Technologies, Inc. Page 3 of 3 3.5.5 Florida Exposure 12 months (FLTM BI 160-01)Panels scribed as in para 3.5.4, shall show no loss of adhesion or visible rusting along the score marks more than 3 mm total width. 3.5.6 Resistance to Scab Corrosion, max 2 mm creep (FLTM BI 123-01) Iron & Steel 3 Cycles Zinc/Zinc Alloy coatings and Aluminum 10 Cycles
