1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 01 08 N-STATUS Replaced by WSS-M1P73-C1/C2 C. Mracna, FNA 2006 05 15 Revised Updated format 1992 10 19 Released NB0010043054207 J. Burke, NAAO; J. Lines, EAO Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Pa
2、ge 1 of 5 PLATING, CHROMIUM, COPPER, NICKEL, WSB-M1P73-B2 DECORATIVE EXTERIOR, ALUMINUM NOT TO BE USED FOR NEW DESIGN 1. SCOPE This specification defines performance requirements for exterior chromium plating systems on aluminum substrates. 2. APPLICATION This specification was released originally t
3、o define a decorative and/or protective metallic finish for aluminum alloy road wheels. Caution: Based upon field survey and accelerated laboratory testing experience, plated parts with designs that are not in conformance with the Corporate Plated Part Design Restrictions Booklet (see para 5.1) will
4、 not be capable of consistently meeting the requirements of these specifications on a production basis without the use of extraordinary processing techniques, e.g., use of auxiliary anodes, reduction in the parts per rack ratio, etc. FEASIBILITY If the requirements of this specification cannot be me
5、t due to part design restrictions, the supplier will inform the responsible product engineering office. Additionally, a “Bumper Plating Restrictions“ Booklet (see para 5.2) was developed to identify those bumper design parameters that provide a basis for consistently meeting the requirements of thes
6、e specifications without the use of extraordinary processing techniques. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. All requirements identified for this specification must be met to achieve acceptable field durability. No one requiremen
7、t, exclusive of others, is capable of ensuring satisfactory performance. Any deviations to the requirements of this specification may be subject to additional performance requirements. All part testing requirements apply to those areas of the part identified as a significant surface per para 5.3 unl
8、ess otherwise specified on the engineering drawing. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). ENGINEERING MATERIAL SPECIFICATIONWSB-M1P73-B2 Printed copies are
9、 uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 5 3.2 APPEARANCE All parts shall have the finish (bright, low gloss or paint overlay) specified on the engineering drawing. The plated parts shall be free from surface imperfections. Low gloss or black parts shall match the approv
10、ed Styling master sample for appearance. 3.2.1 Buffing of Plating Because of the potential adverse effect on corrosion resistance, buffing of final chromium plating on exterior parts is not permitted. Brushing or other approved mechanical treatment on nickel or copper coatings are permitted provided
11、 that minimum plating thickness requirements are met after treatment. 3.3 PRETREATMENT A suitable pretreatment for aluminum must be utilized to provide adequate plate adhesion to the base aluminum. Separate approval for each pretreatment-alloy combination is required and the approved combinations wi
12、ll be shown on the Engineering Materials Approved Source List. 3.4 PLATING ADHESION (ASTM B 571) Adhesion of the electroplate to the base metal and between layers of plating must conform to the requirements of the following test methods per ASTM B 571 unless otherwise indicated: 3.4.1 Bend Tests (Be
13、nd the part or sections of the part) No peeling, flaking, or lift-off of the electroplate from the substrate or between layers of the electroplate is permitted following the bend tests. 3.4.2 Grind-Saw Test No lifting or peeling of the electroplate from the substrate or between layers of the electro
14、plate is permitted following the grind-saw test. 3.5 DUCTILITY (ASTM B 490) Although this is considered a portion of the process control and not a requirement of part performance, the ductility of the electrodeposit on a finished part is considered acceptable when foils plated in the individual nick
15、el baths meet or exceed the following values: Semi-bright Nickel 80% Bright Nickel 20% 3.6 PLATING THICKNESS (ASTM B 487, ASTM B 556, FLTM BQ 103-01) It is the suppliers responsibility to identify the plating thickness distribution for each unique part design and rack design by mapping the plating r
16、acks and plated parts and to employ any special processing techniques, e.g., the use of auxiliary anodes and/or shields, reducing the number of parts per rack etc., which may be required to consistently meet the specified minimum plating thicknesses on all significant surfaces. ENGINEERING MATERIAL
17、SPECIFICATIONWSB-M1P73-B2 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 5 The optical measurement of copper and nickel deposits on significant surfaces shall be considered the standard thickness test method (ASTM B 487). The chromium plate thickness on signi
18、ficant surfaces shall be checked by the spot test as described in ASTM B 556 or by the electronic deplating test, FLTM BQ 103-01, Determination of Thickness of Chromium Plate. In case of dispute, FLTM BQ 103-01 all be the umpire method. The plating thickness requirements identified below represent m
19、inimum values in micrometres and apply to all areas of significant surfaces. Thickness Copper 15 Semi-bright Nickel (a) 30 Bright Nickel (b) plus 10 Special Nickel (c) or Low Gloss Nickel (d) Total Nickel (e) 40 Microporous Chromium (f) 0.18 (a) The sulphur content in the semi-bright nickel bath sha
20、ll be less than 0.005% (weight %). The sulphur content is specified to indicate the type of nickel plating solution that is to be used and may be measured per the test procedures identified in ASTM B 456. In-process testing to determine conformance to the sulphur content requirement is essential to
21、establish and maintain process capability and control. (b) The sulphur content in the bright nickel bath shall be greater than 0.04% (weight %). The sulphur content is specified to indicate the type of nickel plating solution that is to be used and may be measured per the test procedures identified
22、in ASTM B 456. In-process testing to determine conformance to the sulphur content requirement is essential to establish and maintain process capability and control. (c) If a special nickel is employed to produce discontinuities in the chromium deposit, the thickness of the special nickel shall be ad
23、ded to the measurement of the bright nickel deposit to meet the combined bright nickel plus special nickel minimum thickness requirement. If a special nickel layer is not used, the minimum thickness requirement applies only to the bright nickel deposit. (d) Low gloss nickel may be produced by one of
24、 the following methods: 1) Co-deposit containing inorganic particles insoluble in the plating bath. 2) Soluble addition agents co-deposited with the nickel. 3) Mechanical treatment of a bright nickel deposit, e.g., brushing or bead blasting. When low gloss nickel is specified, special nickel need no
25、t be applied. (e) The semi-bright nickel thickness shall be greater than or equal to 60% of the total nickel thickness. The bright nickel thickness shall be less than or equal to 40% of the total nickel thickness. ENGINEERING MATERIAL SPECIFICATIONWSB-M1P73-B2 Printed copies are uncontrolled Copyrig
26、ht 2009, Ford Global Technologies, LLC Page 4 of 5 (f) Microporous chromium plating systems acceptable under this specification are defined as those being capable of producing microporosity in conformance with para 3.7. 3.7 MICROPOROSITY, min 10 000 pores/cm2(FLTM BQ 103-06) 3.8 THERMAL CYCLE AND CA
27、SS TEST (ASTM B 368) There shall be no evidence of plating failure on significant surfaces due to corrosion or loss of adhesion to the substrate after completing three cycles consisting of the following 3.8.1 Requirements for Testing . 121 +/- 2 C for 2 h . 23 +/- 2 C for 1 h . -35 +/- 2 C for 2 h .
28、 23 +/- 2 C for 1 h . 16 h Cass test (ASTM B 368) Note: Parts shall be rinsed with demineralized water only, after each Cass test cycle. Scrubbing, abrasive cleaning or polishing is not permitted. Parts are then examined for corrosion defects. 3.8.2 Plating and Corrosion Defects 3.8.2.1 Cracks and C
29、razing Cracks and crazing of the plating are caused by expansion and/or contraction due to temperature change. Cracks or crazing exceeding 6 mm in length observed on significant surfaces shall be considered failure of the part. 3.8.2.2 Blistering and Corrosion Blisters defined as “pop-ups“ can be ca
30、used by improper plating or be the result of corrosion. Failure is noted when: Any site (pit and/or hole) larger than 1.5 mm on any significant surface (not including run down stain) shall be considered failure of the part. . More than 1% base metal corrosion or blisters (grid method) of the entire
31、significant surface area, shall be considered a failure of the part. . 8% or more blisters or base metal corrosion in a grid section containing 100, 6.0 x 6.0 mm spaces (10 x 10 spaces) placed anywhere on the significant surface (local corrosion) shall be considered failure of the part. ENGINEERING
32、MATERIAL SPECIFICATIONWSB-M1P73-B2 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 5 of 5 3.9 ACCELERATED CORROSION TESTING 60 cycles (FLTM BI 123-01) For initial sample approval only. For plating evaluation see para 3.8.2. 3.10 BRITTLENESS OF PLATED PARTS Parts su
33、pplied shall be free from all factors which result in part brittleness. All heat treating operations shall be completed prior to plating. 3.11 SIMULTANEOUS THICKNESS AND ELECTROCHEMICAL POTENTIAL TEST (S.T.E.P.) (FLTM BQ 104-05) 3.11.1 The semi-bright nickel layer must be more noble (cathodic) than
34、the bright nickel layer by a minimum of 100 millivolts. 3.11.2 If a microporous top nickel layer is used, it shall be equal to or more noble than the bright nickel layer potential. However, the potential of the microporous nickel shall not be more than 20 mv noble (cathodic) to the bright nickel lay
35、er. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 PLATED PART DESIGN RESTRICTIONS BOOKLET Booklet #80-14-154 (Ford Stationery Order Number) entitled, “Influence of Design on the Electroplating of
36、 Exterior Injection Molded Plastic Components and Zinc Die Castings“. Note: Purchased parts suppliers should request a copy of this booklet from their Ford buyer. 5.2 BUMPER PLATING RESTRICTIONS BOOKLET Prepared by Body and Assembly Operations. Note: Purchased parts suppliers should request a copy o
37、f this Booklet from their Ford buyer. 5.3 SIGNIFICANT SURFACES Unless otherwise specified on the engineering drawing, significant surfaces are defined as those surfaces of the finished part that: . Are directly visible and/or visible by reflection when the finished part is assembled in car position. . Can be the source of corrosion products directly visible or visible by reflection.
