1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. AUGUST 2017 Page 1 of 10 NAVISTAR, INC. Material, Parts, and Process Specificatio
2、ns (MPAPS) NUMBER: MPAPS G-7051 Former Designation: TMS-7051 TITLE: Decorative Electroplated Chromium - Plastics CURRENT REV No.: 1708 DATE: Aug. 2017 WRITTEN/EDITED BY: W. Cook APPROVED BY: R. Goluch SUPERSEDES: Rev. 1609 Sept. 2016 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVIS
3、ION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulat
4、ory limits prior to use. 1.0 APPLICATION This specification covers the decorative electroplated chromium used on interior or exterior plastics. These parts may be exterior grilles, light bezels, nameplates, interior ornaments, knobs, or similar applications. 2.0 SCOPE This specification covers the m
5、aterial requirements of the base plastic, plating requirements, performance requirements, quality of the finished part, qualification, source approval and quality control. 2.1 Restricted Chemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification mus
6、t comply with the requirements of the MPAPS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise specified, the latest issue of all referenced standards shall apply. The following standards, specifications and regulations are referenced in this specification. Quality System Standard ISO 9001
7、 or TS-16949 MPAPS DT-20 ASTM B604 CFR Title 29, Part 1910 MPAPS G-19 Part I ASTM B727 NAVISTAR Supplier Packing and Shipping Std. D-13 ASTM B368 ASTM B764 NAVISTAR Engineering Design Std. A-16 ASTM B456 ASTM D883 NAVISTAR MPAPS B-50 ASTM B487 ASTM B532 NAVISTAR EPS-158 ASTM B504 ASTM B374 NAVISTAR
8、EPS-159 ASTM B530 NUMBER: MPAPS G-7051 TITLE: Decorative Electroplated Chromium - Plastics REVISION: 1708 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability.
9、 2017 by Navistar, Inc. AUGUST 2017 Page 2 of 10 4.0 REQUIREMENTS 4.1 Base Plastic The general plastic family from which the unplated plastic part is molded shall be compatible with the particular electroplating process used by the electroplater. The plastic part shall be free from visible molding d
10、efects, sink marks, weld or flow lines. Unless otherwise specified on the part drawing, the significant surface finish shall be equal to or better than the No. 2 diamond finish as found in the SPI-SPE Mold Finish Comparison Kit*. Where necessary, the plastic parts shall be stress relieved prior to p
11、lating. * Available from D-M-E Corporation, 1975 N. 17th Street, Melrose Park, IL - Licensed by Society of Plastic Industry and Society for Plastic Engineers. 4.2. Plating 4.2.1 Appearance Plated parts shall exhibit a bright and uniformly reflective finish, be smooth and free of stains, pin holes, o
12、r other defects affecting the plated appearance or the ability of the plating to pass required corrosion tests on class A and class B surfaces. The appearance of surfaces of production parts shall match color and finish of the master samples agreed upon by Navistar Industrial Design, Supplier Qualit
13、y and the supplier per Navistars Visual Component Approval Process (EPS-158) and Material Styling Evaluation Process (EPS-159). The surface classifications are described below: 4.2.1.1. Class A surfaces are those surfaces which are most prominently visible, or visible by reflection, when the finishe
14、d part is assembled on the truck. 4.2.1.2. Class B Surfaces are those surfaces that are directly but not prominently visible or visible by reflection when the finished part is assembled on the truck 4.2.1.3 Class C surfaces are those surfaces that may be partly, but not directly, visible or mating s
15、urfaces that may be partly covered or hidden when the part is assembled on the truck. 4.2.1.4 Class D surfaces are the non-visible surfaces or on the backside of the part. 4.2.1.5 The appearance of all surfaces shall be consistent with appearance attribute requirements listed for class A, B, C and D
16、 surfaces in the Appendix A.0 or as agreed during visual component approval process. The construction, anodic potential differences, Nickel Sulphur, Chrome micro-discontinuity, and performance requirements of sections 4.3 and 4.4 apply to class A and B surfaces. Class C surfaces must meet performanc
17、e requirements in section 4.4. 4.2.1.6 Trivalent Chrome Plating. Some trivalent chrome plating systems produce chrome that is noted to tarnish in service. It will be the suppliers responsibility to warranty against tarnishing if trivalent chrome is used. 4.3 Plating Thickness and Construction This s
18、ection defines the minimum plated layer thicknesses and their properties required for bright and low gloss, interior and exterior plated plastics. Systems other than those specified which demonstrate satisfactory performance may be approved by Navistar Integrated Product Engineering (IPD). 4.3.1 Pre
19、treatment: 4.3.1.1 Plastic part shall be prepared for electroplating in accordance with ASTM B727 4.3.1.2 ABS and ABS-PC Part designs shall be evaluated for substrate surface stress using Acetic Acid Stress Test (MPAPS DT-20). Report Results to Navistar Engineering. NUMBER: MPAPS G-7051 TITLE: Decor
20、ative Electroplated Chromium - Plastics REVISION: 1708 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. AUGUST 2017 Page 3 of 10 4.
21、3.2 Thickness Minimum Plating Thickness (1), m (mils) Interior Interior Low Gloss Exterior (7) Ductile Copper (5) 13 (0.5) 20 (0.8)(6) 20 (0.8) (6) Total Nickel 5 (0.2) 20 (0.8) 20 (0.8) Semi-Bright (2) - 10 (0.5) (3) 10 (0.5) (3) High Sulfur (2) NA Opt. Opt. Bright (2) or Low Gloss (3) 5 (0.2) 8 (0
22、.3) (3) 8 (0.3)(3) Chromium (4) 0.127 (0.005) 0.254 (0.01) 0.254 (0.01) (1) Plating thickness generally and for sub layers may be determined by using methods described in ASTM B-487, B-504, B-530, or B-764 as appropriate. The plating thicknesses are the minimum values required in all Class A and B s
23、urface locations. Additional copper layer thickness may be required to meet performance requirements in some or all Class A and B surface locations. In such cases the supplier must document the validated minimum copper thickness and maintain that value in production. The drawing should be appropriat
24、ely annotated with check (C-point) locations and thickness minimums. (2) Semi-bright nickel is defined as a nickel plate containing less than 0.005% sulfur; bright nickel contains 0.04% sulfur minimum. The semi-bright and bright layers can be differentiated with an etchant consisting of one-part nit
25、ric acid (specific gravity - 1.42) and four parts glacial acetic acid. A third “High Sulfur Nickel” layer intermediate to the semi-bright and bright nickel layers is optional. When present, the mass % sulfur of the intermediate layer shall be greater than 0.15% and its thickness no greater than 10 %
26、 of the minimum total nickel thickness. Semi bright nickel shall be in no measure less than 50 % of the total nickel layer thickness and the Bright Nickel layer shall be no less the 40% of the minimum total nickel thickness if there is no intermediate high sulfur layer or less than 30 % of the minim
27、um total nickel thickness if there is an intermediate high sulfur layer. The anodic electro-chemical potential differences between layers in multiple layer nickel systems shall be as indicated in MPAPS G-19 Part I. (3) Satin (Satylite) finish is low gloss and created by a mechanical treatment on the
28、 semi-bright nickel and a chemical treatment on the bright nickel. It may be specified for cosmetic appeal. (4) Microporous chrome layers shall exhibit a minimum of 10,000 pores/cm2 as determined by the copper deposition (Dubpernell) method as described in ASTM B 456 or a minimum of 2000 pores/cm2 a
29、s determined by active corrosion sites after testing as described in ASTM B 456. (5) The pretreatment of plastics for decorative plating necessarily involves autocatalytic (electroless) deposition of nickel or copper layer and an additional electrodeposited nickel or copper “strike” before the ducti
30、le copper layer can be applied (ASTM B727). (6) The minimum ductile copper layer thickness on existing parts validated, PPAPd and approved for production prior to August 1, 2017 is 0.7 mil (17.8 microns). (7) Where material specification on an existing drawing indicates Class 1, General Exterior Duc
31、tile Copper Thickness Requirements apply to all locations. Where Class 2 is indicated, the minimum Ductile Copper Thickness is 1.1 mil (28 microns) in all locations. Class designations are no longer required on new part drawings. NUMBER: MPAPS G-7051 TITLE: Decorative Electroplated Chromium - Plasti
32、cs REVISION: 1708 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. AUGUST 2017 Page 4 of 10 4.4 Performance Requirements 4.4.1 Ther
33、mal Cycling and Corrosion Test: Exterior and Interior Parts 4.4.1.1 Method -CASS testing as per ASTM B368 test method and procedure. Plated parts shall be subjected to three complete cycles consisting of the following sequence: 1) 82 3C (180 5F) for 2 hours. 2) 22 3C (72 5F) for 1 hour. 3) -34 1C (-
34、30 2F) for 2 hours. 4) 22 3C (72 5F) for 1 hour. 4.4.1.1.1 Rinse parts with tap water after each complete thermal cycle and examine for defects. 4.4.1.1.2 Exterior parts: Perform CASS corrosion test for 40 hours after the three thermal cycles. 4.4.1.1.3 Interior parts: Perform CASS corrosion test fo
35、r 4 hours after the three thermal cycles. 4.4.1.2 Required There shall be no evidence of plating and/or plastic failure due to cracks, crazing, blistering, corrosion, and/or loss of plating adhesion per methods described in 4.4.4 below. Corrosion failure shall be considered to have occurred if one o
36、r more of the listed conditions develops. 4.4.1.2.1 Surfaces to be examined shall be divided into 6.4 mm (1/4 in) squares with lines having maximum width of 0.13 mm (0.005 in). Corrosion products occur in more than 2% of the grids over the entire significant surface area. 4.4.1.2.2 Corrosion product
37、s larger than 1.6 mm (1/16 in) in diameter are observed. 4.4.1.2.3 Surface pitting corrosion which contains an area of more than 10 spots 1.2 mm (0.048 in) in diameter or larger in any grid section. 4.4.1.2.4 Corrosion products occurring in more than 15% of the grids in any square (10 grids by 10 gr
38、ids) covering significant surface area. 4.4.2 Thermal Shock Test Method 1: Exterior Parts (Obsolete) 4.4.2.1 This method is provided for reference only. Parts validated, PPAPed and released for production under TMS 7051 are subject to the performance requirements of this method. All new exterior par
39、ts and existing exterior parts subject to revalidation and PPAP after March 1, 2017 must meet the performance requirements of Thermal Shock Test Method 2 regardless of class callout. 4.4.2.2 A separate sample shall be subjected to three complete cycles consisting of the following sequence: 1) 85C (1
40、85F) for 30 minutes. 2) -34C (-30F) ethylene glycol/H2O bath for 30 minutes. 4.4.2.3 Parts shall be transferred immediately from one environment to the other with no time allowed between cycles. There shall be no evidence of plating and/or plastic failure due to cracks, crazing, blistering, corrosio
41、n, and loss of plating adhesion per method describe in section 4.4.4.1. 4.4.3 Thermal Shock Test Method 2: Exterior Parts 4.4.3.1 Prepare ten (10) sample parts using the plating requirements of General Exterior parts. Test each part using the procedures described below and inspect for failures. If p
42、lastic to plastic failures are seen, additional ductile copper thickness shall be specified, new samples parts prepared, and this Thermal NUMBER: MPAPS G-7051 TITLE: Decorative Electroplated Chromium - Plastics REVISION: 1708 This document is restricted and may not be sent outside Navistar, Inc. or
43、reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. AUGUST 2017 Page 5 of 10 Shock test shall be repeated. Failure reports for test(s) shall be submitted to Navistar Materials and Navistar Engineering for eva
44、luation. Parts shall be subjected to the following cycles: Cycle 1 1) -40C (-40F) for 2 hours 2) 82C (180F) for 1 hour 3) -40C (-40F) for 2 hours 4) 82C (180F) for 1 hour 5) Inspect part for failures, mark failure points with temperature. Cycle 2 1) -50C (-58F) for 2 hours 2) 82C (180F) for 1 hour 3
45、) -50C (-58F) for 2 hours 4) 82C (180F) for 1 hour 5) Inspect part for failures, mark failure points with temperature. 4.4.3.2 There shall be no evidence of plastic to plastic delamination on any test samples, nor any loss of adhesion as tested by methods described in section 4.4.4. 4.4.4 Adhesion A
46、fter completion of the prescribed thermal cycle test, the corrosion test, and the thermal shock test, passing parts shall be tested for adhesion of the plate to the plastic. 4.4.4.1 Scribe Adhesion: Scribe two lines 2 inches in length (or as long as geometry allows) in the form of an “X“ through the
47、 plating to the plastic surface at each check point (C-point). Exception is allowed where geometry prohibits and/or where superseded by drawing notes. A strip of adhesive tape having an ASTM D3330 180-degree peel strength of 7.6N per 10mm width (3M 898 or equivalent) 76mm (3 inches) wide, and 125 mm
48、 (5 Inches) long shall be applied so that the tape is centered on the scribed x. The tape shall be pulled at 90 to the surface and the part examined for lifting of the electroplate. Evidence of loss of adhesion shall be cause for rejection. 4.4.4.2 Saw Grind Adhesion: Perform test Per ASTM B571 using a 30cm long hand-held hack saw with 24 cross cut teeth per inch. Replace the blade after 50 tests. Cut into the class A surface from the bac
