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. 2014 by Navistar, Inc. DECEMBER 2014 Page 1 of 5 NAVISTAR, INC. Material, Parts, and Process Specificatio
2、ns (MPAPS) NUMBER: MPAPS G-19 Part III Former Designation: CEMS G-19 Part III TITLE: Nickel-Nickel/Chromium-Chromium Plating Coatings for Engineering Standard Parts CURRENT REV No.: 1412 DATE: Dec. 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: CEMS G-19
3、 Part III - April 2002 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION 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 cons
4、ult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use. Change Notice: Changed to new MPAPS format; editorial changes. 1.0 APPLICATION This specification applies to decorative bright and dull multi-layer electroplated coatings for use with de
5、corative fasteners and other parts described in Navistar Engineering Standard Parts (ESP) specifications. 2.0 SCOPE This specification covers the basic requirements for the thinner coatings of nickel or nickel/chromium finishes that are used on Navistar Engineering Standard Parts. . 2.1 Restricted C
6、hemical Substances Effective January 1, 2007, all product supplied to the requirements of this specification must 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
7、Specifications, Standards, and Regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 ASTM B117 NAVISTAR Manufacturing Std. MS-D-13 ASTM B487 NAVISTAR Engineering Design Std A-16 ASTM B555 NAVISTAR MPAPS B-50 CFR Title 29, Part 1910 4.0 REQUIREMENTS Chrome coa
8、tings used for standard parts are classified by their thickness. 4.1 Pre-Plated Surface The articles to be plated will be thoroughly cleaned and free from rust, scale, oil and other foreign matter detrimental to the final finish. The surface will have a sufficiently fine texture to assure the desire
9、d final plating quality. The cleaning operation will be controlled to prevent hydrogen embrittlement, especially in those parts that are hardened, cold worked or subject to high service stresses. See the General Information section at the end of this document for more information. NUMBER: MPAPS G-19
10、 Part III TITLE: Nickel-Nickel/Chromium-Chromium Plating Coatings for Engineering Standard Parts REVISION: 1412 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 liab
11、ility. 2014 by Navistar, Inc. DECEMBER 2014 Page 2 of 5 Navistar Designation Minimum Thickness on Significant Surfaces* Neutral Salt Spray, hours Class Obsolete Engrg Std Parts Spec bright finish dull finish finish finish abbreviation code Nickel Chromium Total* mils m mils m mils m 25CRB 25CRD Chro
12、mium (Bright) (Dull) CRB CRD 100 0.4 10 0.01 0.3 1.0 25 32 13CRB 13CRD 50 0.2 5 0.01 0.3 0.5 13 16 8CRB 8CRD 30 0.2 5 0.01 0.3 0.3 8 8 5CRB 5CRD 20 0.2 5 0.01 0.3 0.2 5 - 3CRB 3CRD 10 0.1 3 0.01 0.3 0.1 3 - 25NIB 25NID Nickel (Bright) (Dull) NIB NID 100 1.0 25 - - 1.0 25 32 13NIB 13NID 50 0.5 13 - -
13、 0.5 13 16 8NIB 8NID 30 0.3 8 - - 0.3 8 8 5NIB 5NID 20 0.2 5 - - 0.2 5 - 3NIB 3NID 10 0.1 3 - - 0.1 3 - * The use of a copper layer beneath the nickel is optional. Copper is not to be substituted for nickel in the minimum requirements for the nickel layer. The total plating thickness is obtained by
14、the use of copper or additional nickel (when necessary). *Significant surfaces will be defined as those surfaces which are visible and subject to wear or corrosion or both, or surfaces on which the coating is otherwise functionally necessary. Generally, it may be defined as those parts of the visibl
15、e surface that can be touched with a 0.75 inch (19 mm) ball on the product; however, all surfaces will be visibly coated. 4.2 Thickness The thickness of plating is shown in the above table. Measurements will be made on significant surfaces. 4.2.1 The test for thickness of coatings on threaded fasten
16、ers such as bolts, nuts, screws, etc., will be made on the shank or other smooth surfaces as nearly adjacent to the thread as practicable. 4.2.2 Special requirements for chromium or nickel plating used on ANSI Class 2A externally threaded fasteners 4.2.2.1 Class 3 is required for ANSI Class 2A threa
17、ds on steel or brass fasteners having 28 threads per inch and finer. Maximum plating thickness permitted is 0.0003 inch (8 m). 4.2.2.2 Class 5 is required for ANSI Class 2A threads on steel fasteners having 24 to 13 threads per inch. Class 5 is also required for ANSI Class 2A threaded brass fastener
18、s having 24 threads per inch and coarser. Maximum plating thickness permitted is 0.0004 inch (10 m). 4.2.2.3 Class 8 is required for ANSI Class 2A threads on steel fasteners having 12 threads per inch and coarser. Maximum plating thickness permitted is 0.0006 inch (15 m). 4.3 Corrosion Base metal co
19、rrosion will not exceed one spot per square inch (6.5 m2) of significant surface and such spots that are visible to the unaided eye and will not exceed 0.06 inch (1.5 m) in any dimension. 4.3.1 Salt spray requirements do not apply to internal threads except by agreement between supplier and purchase
20、r. NUMBER: MPAPS G-19 Part III TITLE: Nickel-Nickel/Chromium-Chromium Plating Coatings for Engineering Standard Parts REVISION: 1412 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to a
21、ssume all patent liability. 2014 by Navistar, Inc. DECEMBER 2014 Page 3 of 5 4.4 Methods of Test 4.4.1 Thickness Determine by microscopic examination of cross section according to ASTM B 487. Chromium may be determined by the drop test method described in ASTM B 555. Magnetic or eddy current methods
22、 if applicable, may be used when agreed upon by purchaser and supplier. 4.4.2 Corrosion This test will be conducted according to ASTM B 117. 5.0 QUALITY The chromium coating will have a bright reflective finish unless otherwise specified, or in accordance with samples submitted. The plating will be
23、smooth, dense and uniform and substantially free from defects, such as blisters, cracks, stains or foreign matter, that may affect the appearance or protective value of the coatings. 6.0 QUALIFICATION Engineering qualification of sources is required in advance of production shipments. Suppliers shal
24、l submit samples for approval of finish, luster, color and appearance to the Navistar Industrial Design Group. Samples shall be accompanied by test data certifying that all requirements of the specification have been met. Upon approval, styling master samples denoting the minimum level of acceptable
25、 appearance quality shall be developed and retained by the supplier and the quality department of each using NAVISTAR facility. 6.1 Quality Control Plan A Quality Control Plan for products supplied to the requirements of this specification will be established by mutual agreement between NAVISTAR and
26、 the supplier. Unless specific exception is noted, the following characteristics, where applicable*, shall be included in the plan as features for management by statistical process control.* * Other characteristics for inclusion in the control plan may be specified on the engineering drawing and/or
27、purchase order. * See NAVISTAR Engineering Design Standard A-16 7.0 SOURCE APPROVAL AND QUALITY CONTROL 7.1 Supplier Requirements All suppliers to NAVISTAR are required to be registered to ISO 9001 Quality System Requirements. NAVISTAR will also accept TS-16949 registration as long as the supplier c
28、an also fulfill all AIAG PPAP (Production Part Approval Process) documentation and approval requirements. Suppliers must maintain their certification with an accredited registrar and must furnish copies of registration certificates to their Corporate Buyer upon request. 7.2 Approval Parts supplied a
29、gainst contracts or purchase orders citing this specification shall be equivalent in all respects to those samples which were approved by the purchaser. No changes in formulation or Coating Thickness NUMBER: MPAPS G-19 Part III TITLE: Nickel-Nickel/Chromium-Chromium Plating Coatings for Engineering
30、Standard Parts REVISION: 1412 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. 2014 by Navistar, Inc. DECEMBER 2014 Page 4 of 5 processing practices are p
31、ermitted without approval. In the event that changes in material, properties, processing practices, construction, color, or labeling of the product are required, the supplier shall notify NAVISTAR Materials Engineering and Purchasing and Supplier Development of the proposed change(s). Test data indi
32、cating conformance to all requirements of this specification, test samples, and new or amended or updated Material Safety Data Sheet(s) (MSDS), in accordance with CFR Title 29, Part 1910 shall be submitted with the request for change. 7.3 Process Control The supplier shall either perform and report
33、results of tests on specific lots of parts produced using ISO 9001 or TS-16949 guidelines, or provide statistical evidence of the lot having been produced in a state of statistical control and with a process capable of providing all required properties. The part supplier and the quality control mana
34、ger of the using NAVISTAR plant may determine testing and reporting requirements on specific products. 8.0 SHIPPING AND HANDLING Shipping and identification shall be in accordance with NAVISTAR Manufacturing Standard MS-D-13. Parts shall be packaged so as to avoid any damage in shipment detrimental
35、to the appearance of the part. 9.0 DESIGNATION ON DRAWINGS The designation of coating types and classes for standard parts is described in the NAVISTAR Engineering Standard Parts specifications. 9.1 For parts that are not included in the Engineering Standard Parts specifications, the electroplated c
36、oating will be designated on drawings and purchase orders as follows: Examples: Bright Nickel, Class 8NIB, MPAPS G-19 Part III Dull Chromium, Class 8CRD, MPAPS G-19 Part III 9.2 If the part to be plated is considered susceptible to failure because of hydrogen embrittlement, the drawing should specif
37、y “must be free from hydrogen embrittlement”. This is intended to serve as a warning to the plater that the method of cleaning and the baking time and temperature should be carefully considered and controlled. In some applications of industrial plating, it may be desirable to bake both before and af
38、ter plating. 10.0 TECHNICAL INFORMATION For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Avenue Melrose Park, IL 60160 E-mai
39、l: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/ NUMBER: MPAPS G-19 Part III TITLE: Nickel-Nickel/Chromium-Chromium Plating Coatings for Engineering Standard Parts REVISION: 1412 This document is re
40、stricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. DECEMBER 2014 Page 5 of 5 A.0 GENERAL INFORMATION A.1 Hydrogen Embrittlement Hydrogen embrittlement i
41、s a term used to describe a phenomenon that occurs due to absorption of atomic or protonic hydrogen during processing. Steels having tensile strengths 1000MPa and/or are harder than 300HV10kgf, 303 HB, or 31 HRC, or which are intentionally surface hardened, should be heat treated to reduce the risk
42、of hydrogen embrittlement as described below. Hydrogen embrittlement causes either a loss in load carrying ability or a reduced capacity for slow plastic strain. Constant load “delayed fracture” tests are a sensitive means of quantifying the effect. Minute amounts of hydrogen can have major effects.
43、 Contrary to the usual effect of embrittlement, effects of hydrogen decrease with increasing strain rate. The phenomenon is most pronounced at intermediate temperatures, but disappears at high and low temperatures. A.1.1 The only practical way to remove absorbed hydrogen is to heat the plated parts
44、at a temperature sufficiently high and for a period sufficiently long to remove the hydrogen. The time and temperature depend on the metal involved, its size, its metallurgical history and the quantity of hydrogen absorbed. The higher the strength of the steel, the more severe is the effect of the h
45、ydrogen embrittlement. See ASTM Guide B850 for specific recommendations additional information on mitigation of hydrogen embrittlement A.1.2 Hydrogen can be introduced during cleaning as well as during plating, therefore care must be used in selecting the method of cleaning so that hydrogen will not be absorbed by the parts prior to plating.
