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 1988 04 20 Released SM/ER 3840 TC J. Burke, JAF, MP. NAAO. J. Lines. EAO Printed copies are uncontrolled Copyright 2009, Ford Global Technologies,
2、 Inc. Page 1 of 5 PLATING, CHROMIUM - COPPER - NICKEL - WSB-M1P73-B 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 o
3、riginally to define a decorative and/or protective metallic finish for aluminum parts. 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 met
5、 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 these
6、 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 each specification must be met to achieve acceptable field durability. No one requirement
7、, exclusive of others, is capable of insuring satisfactory performance. Any deviations to the requirements of these specifications 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 un
8、less 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-B Printed copies are
9、 uncontrolled Copyright 2009, Ford Global Technologies, Inc. Page 2 of 5 3.1 STATISTICAL PROCESS The following characteristics shall form part of the Control Plan but shall in no way preclude the control of additional characteristics deemed significant by the supplier and/or Ford SQA. Significant Ch
10、aracteristics (See requirement values within the body of these specifications) . Plating Thickness . Plating Ductility . Microporosity . S.T.E.P. Potential . Sulphur Content 3.2 APPEARANCE All parts shall have the finish (bright, low gloss or paint overlay) specified on the engineering drawing. The
11、plated parts shall be free from surface imperfections. Low gloss or black parts shall match the approved 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 permitte
12、d. Brushing or other approved mechanical treatment on nickel coatings are permitted provided 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 a
13、pproval for each Pretreatment-Alloy combination is required and the approved combinations will 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 o
14、f the following test methods per ASTM B 571 unless otherwise indicated: 3.4.1 Bend Tests (Bend 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 N
15、o lifting or peeling of the electroplate from the substrate or between layers of the electroplate is permitted following the grind-saw test. ENGINEERING MATERIAL SPECIFICATIONWSB-M1P73-B Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, Inc. Page 3 of 5 3.5 DUCTILITY (ASTM B
16、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 nickel baths meet or exceed the following values: Semi-bright Nickel 80% Br
17、ight Nickel 20% 3.6 PLATING THICKNESS (ASTM B 487, ASTM B 556) It is the suppliers responsibility to identify the plating thickness distribution for each unique part design and rack design by mapping the plating racks and plated parts and to employ any special processing techniques, e.g., the use of
18、 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. The optical measurement of copper and nickel deposits on significant surfaces shall be considered the standa
19、rd thickness test method (ASTM B 487). The chromium plate thickness on significant surfaces shall be checked by the spot test as described in ASTM B 556 or by the Coulometric method, ASTM B-504. In case of difference, ASTM B 504 shall be the umpire method. The plating thickness requirements identifi
20、ed below represent minimum values in micrometers 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-br
21、ight nickel bath shall 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 requirem
22、ent is essential to 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 pr
23、ocedures identified 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. ENGINEERING MATERIAL SPECIFICATIONWSB-M1P73-B Printed copies are uncontrolled Copyright 2009, Ford Global Technolog
24、ies, Inc. Page 4 of 5 (c) If a special nickel is employed to produce discontinuities in the chromium deposit, the thickness of the special nickel shall be added to the measurement of the bright nickel deposit to meet the combined bright nickel plus special nickel minimum thickness requirement. If a
25、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 the following methods: 1. Co-deposit containing inorganic particles insoluble in the plating bath. 2. Soluble addition agents co-deposited wit
26、h 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 not be applied. (e) The semi-bright nickel thickness shall be greater than or equal to 60% of the total nickel thickness. The bright nickel thick
27、ness shall be less than or equal to 40% of the total nickel thickness. (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
28、ACCELERATED CORROSION RESISTANCE (CASS Test) 22 h (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. Following CASS exposure for the appropriat
29、e duration as specified, failure is to be noted as follows: . Any evidence of base metal corrosion deposits or blisters on significant surfaces shall constitute failure of the part. . Any pit larger than 1.5 mm in diameter visible on any significant surface shall be considered failure of the part. 3
30、.9 CORROSION PROTECTION All chromium bumpers plated to this specification must have a rust preventative compound, ESB-M7C68 applied to the backside of the bar after plating. The compound must be properly cured prior to packaging and shipping. 3.10 BRITTLENESS OF PLATED PARTS Parts supplied shall be
31、free from all factors which result in part brittleness. All heat treating operations shall be completed prior to plating. ENGINEERING MATERIAL SPECIFICATIONWSB-M1P73-B Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, Inc. Page 5 of 5 3.11 SIMULTANEOUS THICKNESS AND ELECTROCH
32、EMICAL POTENTIAL TEST (S.T.E.P.) (ASTM B 764) 3.11.1 The semi-bright nickel layer must be more noble (cathodic) than 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. Ho
33、wever, the potential of the microporous nickel shall not be more than 20 mv noble (cathodic) to the bright nickel layer. 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 RESTRICTI
34、ONS BOOKLET Booklet #80-14-154 (Ford Stationery Order Number) entitled, “Influence of Design on the Electroplating of 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 R
35、ESTRICTIONS BOOKLET Prepared by Body and Assembly Operations. Note: Purchased parts suppliers should request a copy of 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 finishe
36、d 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. 5.4 SAMPLING AND INSPECTION As specified in Quality Control Specification Q-101, Appendix D and c
37、onsistent with the appropriate Engineering Specification (ES) as released by the responsible design engineering activity. 5.5 INITIAL APPROVAL TESTS These tests are normally performed only for initial material approval and are not required for normal production control purposes. Salt Spray, min 1000 h (ASTM B 117)
