1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 00 2013 07 18 Released G. Weber, FNA Controlled document at www.MATS Copyright 2013, Ford Global Technologies, LLC Page 1 of 5 PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE WSS-M1P87-B1 PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE, WSS-M1P
2、87-B2 ORGANIC SEALANT PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE, WSS-M1P87-B3 ORGANIC SEALANT, BLACK PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE, WSS-M1P87-B4 INORGANIC SEALANT PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE, WSS-M1P87-B5 INORGANIC SEALANT, BLACK 1. SCOPE These specifications defin
3、e performance requirements for electrolytically plated, passivated zinc-nickel coatings on ferrous parts (stampings, forgings, castings, etc.), some of which additionally have a topcoat sealant. 2. APPLICATION These specifications were originally released to define performance requirements for elect
4、rolytically plated zinc-nickel coatings where corrosion protection and/or decorative appearance of ferrous surfaces is required. Parts may be rack or barrel plated. Plating bath chemistry (acid or alkaline) should be chosen for best performance in the application. A supplementary passivation treatme
5、nt, either trivalent chromium or chromium-free, shall be applied to zinc-nickel plated parts to retard the formation of white corrosion products. A thin film passivate will preserve the silver color of the plating or impart a slight blue tint. Thick film passivates give the plating an iridescent or
6、colored appearance. Sealants are applied to extend the corrosion protection of the plated part. Inorganic sealants generally resist heat and degradation due to automotive fluids better than organic sealants. WSS-M1P87-B1 is suitable for underbody or underhood applications which receive minimal road
7、spray, or where parts will subsequently be painted. WSS-M1P87-B2 and B3, which include an organic sealer, are suitable for underbody or underhood applications where additional corrosion protection is required, and are recommended for use at service temperatures of 150 C maximum. WSS-M1P87-B4 and B5,
8、 which include an inorganic sealer, are suitable for underbody or underhood applications where exposure to heat or incidental exposure to automotive fluids is anticipated, and are recommended for use at service temperatures of 250 C maximum. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION M
9、ATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 THICKNESS 8 14 micrometers (ASTM B659 / ASTM B568 / ASTM B487) ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2013, Ford Global Technologies,
10、 LLC Page 2 of 5 The thickness of the electroplated zinc-nickel layer shall meet the requirements stated above on all significant surfaces (as defined in section 4.1) unless otherwise specified on the Engineering Drawing. In case of dispute, the thickness measurement umpire method shall be metallogr
11、aphic sectioning per ASTM B 487. The passivate and sealant layers are not subject to measurement, but shall be sufficient to meet the Appearance and Laboratory Accelerated Corrosion Test requirements. 3.3 APPEARANCE WSS-M1P87-B1: Parts may be blue-bright or show a slight iridescence. When dyes are u
12、sed to produce other colors, the color shall be stated on the Engineering Drawing. WSS-M1P87-B2, B4: Parts naturally show a slight iridescence. When dyes are used to produce other colors, the color shall be stated on the Engineering Drawing. WSS-M1P87-B3, B5: Parts will be black. 3.4 COMPOSITION (AS
13、TM B568) The zinc-nickel plating shall have a nickel content of 12 to 16 weight percent, with the balance zinc. The plating shall be a uniform, homogeneous alloy of zinc and nickel throughout the thickness of the deposit and across the high and low current densities of the part. Chemical composition
14、 of the coating may be determined by any applicable test method. With proper calibration, x-ray fluorescence (XRF) spectroscopy can be used to determine the coating composition and thickness simultaneously. In case of dispute, atomic absorption (AA), directly-coupled plasma (DCP) or inductively-coup
15、led plasma (ICP) spectroscopy using known standards shall be used as umpire methods. Zinc-nickel alloy is the only deposit to be applied directly to the base. The use of a zinc strike is not permitted. 3.5 PLATING ADHESION (ASTM B 571) The coating shall withstand normal handling, storage, and instal
16、lation without flaking or peeling or other loss of adhesion. Electroplate adhesion to the base metal shall conform to the requirements of one of the following test methods per ASTM B 571 unless otherwise indicated on the Engineering Drawing. 3.5.1 Grind-Saw Test No lifting or peeling of the plating
17、from the substrate is permitted following the grind-saw test. 3.5.2 Burnishing Test No blistering, lifting, or peeling of the plating from the substrate is permitted following the burnishing test. 3.6 LABORATORY ACCELERATED CYCLIC CORROSION TESTING (CETP 00.00-L-467) Non-Ferrous Corrosion Ferrous Co
18、rrosion WSS-M1P87-B1 0 Weeks 4 Weeks WSS-M1P87-B2, B3, B4, B5 1 Weeks 6 Weeks ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2013, Ford Global Technologies, LLC Page 3 of 5 Testing shall be done on coated parts whenever possible (not panels). Parts for testing shall have no visible non
19、-ferrous corrosion products at the beginning of testing. Parts shall be tested in vehicle orientation. Failure is constituted by evidence of corrosion products on surfaces directly visible in the application on the vehicle, or rundown of corrosion products onto directly visible surfaces, at the spec
20、ified test interval. Evaluation shall be done without magnification at a normal reading distance. Zinc-nickel plating may form a haze, known as “white blush“ or “gray veil“, early in the course of corrosion testing and visible only when parts are dry. This haze is not voluminous, and is normal and a
21、cceptable for parts produced to this specification, as long as the non-ferrous and ferrous corrosion requirements are otherwise met. 3.6.1 Potential Assembly Damage Assembly of components onto a vehicle can result in damage to the coating. Where possible, assembly damage should be simulated prior to
22、 the start of corrosion testing. Consult Ford Product or Materials Engineering for guidance. 3.6.2 Exceptions Depending upon the location of the part on a vehicle, exceptions to this requirement may apply for specific applications. Any exceptions are listed in Global Engineering Standard for Total V
23、ehicle Corrosion Resistance, 18-0040 (RQT-001101-002492), and illustrated in the appended photo evaluation guide. Consult Ford Product or Materials Engineering for guidance. 3.7 SEALANTS (WSS-M1P87-B2/B3/B4/B5) When a sealant is applied to the passivated zinc-nickel plating, the sealant supplier nam
24、e and product name should be stated on the Engineering Drawing. Example: Zinc Nickel Plating per WSS-M1P87-B2, Plating Co. Ultrasealer 101 3.8 EMBRITTLEMENT Parts plated to this specification shall be free from the detrimental effects of hydrogen embrittlement or other factors which result in part b
25、rittleness. All parts shall meet the requirements of WSS-M99A3-A. 3.9 PROCESS CONTROL ITEMS 3.9.1 Plating Adhesion Heat Quench Test Heat quench testing may be used for process control but not for initial qualification to this standard. Heat plated parts to 220 +/- 5C for 30 +/- 5 minutes, then quenc
26、h in room temperature water. No blistering or peeling of the plating from the substrate is permitted. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. Contact for questions concerning Engineering Mat
27、erial Specifications. 4.1 SIGNIFICANT SURFACES Significant surfaces should be noted on the Engineering Drawing. If not noted there, significant surfaces are generically defined as those surfaces of the finished part that: Are directly visible when the finished part is assembled in position. Can be a
28、 source of corrosion products directly visible, visible by reflection, or visible when they run down the part or onto other parts. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2013, Ford Global Technologies, LLC Page 4 of 5 Can affect fit or function of the part. Note: Small areas of
29、 ferrous corrosion may be allowed on sharp edges, corners, and recesses due to reduced coverage of the electroplating. Recesses are generally defined as areas unreachable by a 13 mm (0.5 inch) diameter sphere. 4.2 NEUTRAL SALT SPRAY CORROSION TESTING (ASTM B 117) Neutral salt spray (NSS) testing is
30、not to be used to show conformance to this specification. NSS testing is often used as a process control tool by plating applicators, and as such shall form part of the Control Plan. Non-Ferrous Corrosion Ferrous Corrosion WSS-M1P87-B1 120 hours 600 hours WSS-M1P87-B2, B3, B4, B5 240 hours 960 hours
31、 Zinc-nickel plating may form a haze, known as “white blush“ or “gray veil“, early in the course of corrosion testing and visible only when parts are dry. This haze is not voluminous, and is normal and acceptable for parts produced to this specification, as long as the non-ferrous and ferrous corros
32、ion requirements are otherwise met. 4.3 RECOMMENDED TESTING REQUIREMENTS FOR DESIGN VALIDATION, PRODUCTION VALIDATION, AND SREA. Coating performance is a function of material selection, surface preparation, and coating application. For established coatings and coating lines, this may permit a reduce
33、d test schedule to validate compliance to this specification. Use Table 1 below to determine the recommend test plan depending 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
34、. These changes may require vehicle testing, consult SDS/ARL requirements. Part shape will play a significant role in the uniformity of the deposit and designs with deep recesses or Faraday effects may have reduced performance without special auxiliary anodes or shields. ENGINEERING MATERIAL SPECIFI
35、CATION WSS-M1P87-B1/B5 Copyright 2013, Ford Global Technologies, LLC Page 5 of 5 TABLE 1 RECOMMENDED TESTING REQUIREMENTS New Plating System Established Plating System All Applicators New Applicator (No Ford History) Existing Applicator (Plating other Ford Parts) Test Requirement All Parts Existing
36、Part New Part for a Different Application Switching Known Systems on Existing Part New Part/Same System Process Change Example A Example B Example C Example D Example E Example F 3.2 Thickness X X X X X Contact Materials Engineering 3.4 Composition X X X X X 3.5 Adhesion X X X X X 3.6 Laboratory Acc
37、elerated Cyclic Corrosion X X X1 X1 X1 1 Potential use of surrogate data Example A: A new plating system is developed by a finish supplier for automotive applications. Example B: Applicator goes out of business. New applicator uses the same plating system, but it has never plated parts for Ford. Exa
38、mple C: Applicator is asked to plate parts for a different Tier 1 part supplier. Example D: Tier 1 part supplier changes among plating systems. Both systems are widely used at Ford. Example E: Applicator is plating the first run of PPAP parts for new model program on the plating line that supports current model. Example F: The level of testing is highly dependant on what is changing. Contact Fastener and/or Materials Engineering.
