1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 01 2017 07 28 Revised See revision list at end of document L. Click, FNA 2013 07 18 Released G. Weber, FNA Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 6 PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIV
2、ATE WSS-M1P87-B1 PLATING, ELECTROLYTIC ZINC-NICKEL, PASSIVATE, WSS-M1P87-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
3、-M1P87-B5 INORGANIC SEALANT, BLACK 1. SCOPE These specifications define 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
4、 were originally released to define performance requirements for electrolytically 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 be
5、st performance in the application. A passivation treatment, 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.
6、Thick film passivates give the plating an iridescent or colored appearance. Sealants are applied to extend the corrosion protection of the plated part. Sealers can be organically or inorganically based, or a mixture of organic and inorganic components. Inorganic sealers will generally resist heat an
7、d degradation due to automotive fluids better than organic sealers. WSS-M1P87-B1 is suitable for underbody or underhood applications which receive minimal road spray, or where parts will subsequently be painted. The passivate prevents white corrosion products from forming during transport from the p
8、lating facility to the painting facility. The passivate may not be needed if the parts are painted within a few hours of electroplating. WSS-M1P87-B2 and B3, which include an organic sealer, are suitable for underbody or underhood applications where additional corrosion protection is required, and a
9、re recommended for use at service temperatures of 150 C maximum. WSS-M1P87-B4 and B5, 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 temp
10、eratures of 250 C maximum. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2017, Ford Global Technologies, LLC Page 2 of 6 2.1. LIMITATIONS Not all passivates can be successfully painted, so part trials must be performed to verify adhesion of the paint to passivate. Paint lines with str
11、ong alkaline cleaners may remove the passivate which is acceptable if a pretreatment such as zinc phosphate is applied prior to paint. Sealers typically prevent paint from bonding to the surface. 3. REQUIREMENTS 3.1 APPROVED SOURCES This specification is performance based and does not have approved
12、sources. 3.2 THICKNESS 8 m, min (ASTM B659 / ASTM B568 / ASTM B487) The minimum thickness applies to all significant surfaces as defined in section 4.1 unless otherwise specified on the Engineering Drawing. A maximum plating thickness should be stated on the Engineering Drawing if thick deposits wil
13、l negatively impact tolerances, functional requirements, assembly, or appearance. In case of dispute, the thickness measurement umpire method shall be metallographic sectioning per ASTM B 487. The passivate and sealant layers are not subject to measurement, but shall be sufficient to meet the Appear
14、ance 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 used to produce other colors, the color shall be stated on the Engineering Drawing. WSS-M1P87-B2, B4: Parts naturally show a slight iridescen
15、ce. 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 (ASTM 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 unifo
16、rm, 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 of the coating may be determined by any applicable test method. With proper calibration, x-ray fluorescence (XRF) spectroscopy can be used
17、to determine the coating composition and thickness simultaneously. In case of dispute, atomic absorption (AA), directly-coupled plasma (DCP) or inductively-coupled plasma (ICP) spectroscopy using known standards shall be used as umpire methods. Zinc-nickel alloy is the only deposit to be applied dir
18、ectly to the base. The use of a zinc strike is not permitted. 3.5 PLATING ADHESION (ASTM B571) The coating shall withstand normal handling, storage, and installation without flaking or peeling or other loss of adhesion. Electroplate adhesion to the base metal shall conform to the requirements of one
19、 of the following test methods per ASTM B571 unless otherwise indicated on the Engineering Drawing. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2017, Ford Global Technologies, LLC Page 3 of 6 3.5.1 Grind-Saw Test No lifting or peeling of the plating from the substrate is permitted f
20、ollowing 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 Corrosion WSS-M1P87-B1 0 Weeks 4 We
21、eks WSS-M1P87-B2, B3, B4, B5 1 Weeks 6 Weeks Testing shall be done on coated parts whenever possible (not panels). Parts for testing shall have no visible non-ferrous corrosion products at the beginning of testing. Part orientation during testing should mimic components in-vehicle conditions includi
22、ng spray direction, solution pooling, and attachment of mating components when possible. Failure is constituted by evidence of corrosion products on significant surfaces or rundown of corrosion products onto significant surfaces, at the specified test interval. Evaluation shall be done without magni
23、fication at a normal reading distance. Parts that are subsequently painted should be tested to the requirements for the paint. Corrosion testing in the ”as plated” state is not required when the part is subsequently painted. Zinc-nickel plating may form a haze, known as “white blush“ or “gray veil“,
24、 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 corrosion requirements are otherwise met. 3.6.1 Potential Assembly Damage Assembly
25、 of components onto a vehicle can result in damage to the coating. Where possible, assembly damage should be simulated prior to 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, exception
26、s to this requirement may apply for specific applications. Any exceptions are listed in Global Engineering Standard for Total Vehicle Corrosion Resistance, 18-0040 (RQT-001101-002492), and illustrated in the appended photo evaluation guide. Consult Ford Product or Materials Engineering for guidance.
27、 3.7 SEALANTS (WSS-M1P87-B2/B3/B4/B5) When a sealer is applied to the passivated zinc-nickel plating, the type of sealer (organic, inorganic or mixed organic-inorganic) shall be stated on the Engineering Drawing along with the appropriate specification. The sealant supplier name and product name sho
28、uld be included if known. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2017, Ford Global Technologies, LLC Page 4 of 6 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 ef
29、fects of hydrogen embrittlement or other factors which result in part brittleness. All parts shall meet the requirements of WSS-M99A3-A. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. Contact for q
30、uestions concerning Engineering Material 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
31、 is assembled in position. Can be a source of corrosion products directly visible, visible by reflection, or visible when they run down the part or onto other parts. Can affect fit or function of the part. Note: Small areas of ferrous corrosion may be allowed on sharp edges, corners, and recesses du
32、e to reduced coverage of the electroplating. Recesses are generally defined as areas unreachable by a 13 mm (0.5 inch) diameter sphere. 4.2 PROCESS CONTROL ITEMS 4.2.1 Neutral Salt Spray Corrosion Testing (ASTM B117) Neutral salt spray (NSS) testing is not acceptable in showing initial conformance t
33、o this specification. However, 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 Zinc-nickel plating may fo
34、rm 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 corrosion requirements are otherw
35、ise met. 4.2.2 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 quench in room temperature water. No blistering or peeling of the plating from the subst
36、rate is permitted. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2017, Ford Global Technologies, LLC Page 5 of 6 4.3 RECOMMENDED TESTING REQUIREMENTS FOR DESIGN VALIDATION, PRODUCTION VALIDATION, AND SREA. Coating performance is a function of material selection, surface preparation, a
37、nd 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 on the situation. This specification cannot prove out parts or coatings that invo
38、lve changes in vehicle environment such as increased stone chipping or increased temperature. 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 r
39、educed performance without special auxiliary anodes or shields. 4.4 SUPPLIERS ONGOING RESPONSIBILITY All materials must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making any changes to the material originally approved, whether or not suc
40、h changes affect the materials ability to meet the specification requirements, the supplier shall notify the affected Supplier Technical Assistance (STA), Purchasing, and Materials Engineering activities of the proposed changes (with reasons) by submission of a completed Suppliers Request for Engine
41、ering Approval, SREA. For parts and components using Ford Engineering Material Specifications, all samples tested to the specifications for Design Verification (DV), Production Verification (PV) and Production Part Approval Process (PPAP) sign off must be kept until Job 1. 4.5 RESTRICTED SUBSTANCE M
42、ANAGEMENT STANDARD Substance restrictions imposed by regulations or Company direction applies to the materials addressed by this document. The restrictions are identified in the Restricted Substance Management Standard WSS-M99P9999-A1 which is updated yearly. It is the suppliers responsibility to co
43、mply with this standard on a continuing basis through IMDS and or GMAP reporting. ENGINEERING MATERIAL SPECIFICATION WSS-M1P87-B1/B5 Copyright 2017, Ford Global Technologies, LLC Page 6 of 6 TABLE 1 RECOMMENDED TESTING REQUIREMENTS New Plating System Established Plating System All Applicators New Ap
44、plicator (No Ford History) Existing Applicator (Plating other Ford Parts) Test Requirement All Parts Existing 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 Thickne
45、ss 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 Accelerated Cyclic Corrosion X X X1 X1 X1 1 Prior testing on similar parts (parts with the same chemistry or applicator) may be acceptable as surrogate data, as determined by Materials Engineer
46、ing. 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. Example C: Applicator is asked to plate parts for a different Tier 1 pa
47、rt 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
48、 what is changing. Contact Fastener and/or Materials Engineering. 5. SUMMARY OF REVISIONS 2017 07 28: Modify verbiage of Application section. Add Limitations section. Remove maximum plating thickness requirement. Clarify Laboratory Accelerated Cyclic Corrosion requirements. Move Process Control Item (Plating Adhesion- Heat Quench Test) from Requirements to General Information. Update Sealant callout information. Clarify description of surrogate data.
