1、I INTERNATIONAL TRUCK and ENGINE CORPORATION I CEMS (CORPORATE ENGINEERING MATERIAL SPECIFICATION) Nickel-NickeVChromium-Chromium Plating - Coatinps for International Standard Parts TI TL E: WHTTENREVIE WED BY: APPRO VED Bi? Materials Engineering Materials Engineering NUMBER: CEMS G-19, Part III Apr
2、il 2002 July 1999 CURRENT ISSUE DATE: SUPERSEDES ISSUE OF: PART III 1.0 SCOPE This specification is in three parts: Part I - Decorative Coatings Part II - Engineering Coatings Part III - Coatings for International Standard Parts COATINGS FOR INTERNATIONAL STANDARD PARTS This part of the specificatio
3、n covers the basic requirements for the thinner coatings of nickel or nickel/chromium finishes that are used on International Standard Parts. 2.0 INTRODUCTION Chrome platings in Part III of this specification are intended for use with decorative fasteners listed in International Standard parts. 3.0
4、CONTENTS INTRODUCTION REFERENCE DOCUMENTS CLAS SIFICATION GENERAL REQUIREMENTS QUALITY SOURCE APPROVAL AND QUALITY CONTROL PACKING AND SHIPPING PAGE 1 2 2 2 3 3 4 This document is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from
5、Corporate Technical Standards. Suppliers are required to assume all patent liability. 02002 International Truck and Engine Corporation. APRIL 2002 Page i of4 Copyright International Truck and Engine Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking perm
6、itted without license from IHS-,-,-NUMBER: CEMS G-19, Pt. 111 PART III 4.0 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. TITLE: CURRENT ISSUE DATE
7、: Nickel-Nickel/Chromium-Chromium Plating April 2002 Quality System Standard QS-9000 (IS0 9001) INTERNATIONAL IQR Quality Standard INTERNATIONAL Manufacturing Standard D-13 INTERNATIONAL Engineering Std. Parts Books CFR Title 29, Part 1910 ASTM B 117 ASTM B 487 ASTM B 555 5.0 CLASSIFICATION OR GRADE
8、 DESIGNATION Chrome coatings for standard parts are classified by their thickness. 6.0 GENERAL REQUIREMENTS * 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
9、 by the use of copper or additional nickel (when necessary). * Significant surfaces will be defiied 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 v
10、isible surface that can be touched with a .75 inch (19 mm) ball on the product; however, all surfaces will be visibly coated. 6.1 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 surf
11、ace will have a sufficiently fine texture to assure the desired fiial 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 ”Appendix - General Information”. 6.2
12、Thickness - The thickness of plating is shown in General Requirements table above. Measurements will be made on significant surfaces.* This document is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standard
13、s. Suppliers are required to assume all patent liability. 02002 International Truck and Engine Corporation. APRIL 2002 Page 2 of 4 Copyright International Truck and Engine Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from
14、IHS-,-,-NUMBER: CEMS G-19, Pt. 111 PART III 6.2.1 The test for thickness of coatings on threaded fasteners such as bolts, nuts, screws, etc., will be made on the shank or other smooth surfaces as nearly adjacent to the thread as practicable. 6.2.2 Special requirements for chromium or nickel platings
15、 used on ANSI Class 2A externally threaded fasteners 6.2.2.1 Class 3 is required for ANSI Class 2A threads on steel or brass fasteners having 28 threads per inch and finer. Maximum plating thickness permitted is .O003 inch (8 pm). 6.2.2.2 Class 5 is required for ANSI Class 2A threads on steel fasten
16、ers having 24 to 13 threads per inch. Class 5 is also required for ANSI Class 2A threaded brass fasteners having 24 threads per inch and coarser. Maximum plating thickness permitted is .O004 inch (10 pm). 6.2.2.3 Class 8 is required for ANSI Class 2A threads on steel fasteners having 12 threads per
17、inch and coarser. Maximum plating thickness permitted is .O006 inch (15 pm). 6.3 Corrosion Base metal corrosion will not exceed one spot per square inch (6.5 pm2) of significant surface and such spots that are visible to the unaided eye and will not exceed 0.06 inch (1.5 pm) in any dimension. 6.3.1
18、Salt spray requirements do not apply to internal threads except by agreement between supplier and purchaser. TITLE: CURRENT ISSUE DATE: Nickel-Nickel/Chromium-Chromium Plating April 2002 7.0 QUALITY The chromium coating will have a bright reflective finish unless otherwise specified, or in accordanc
19、e with samples submitted. The plating will be 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. 8.0 METHODS OF TEST 8.1 Thickness Determine by microscopic examination
20、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 if applicable, may be used when agreed upon by purchaser and supplier. 8.2 Neutral Salt Spray Test This test will be conducted according to ASTM B 11
21、7. 9.0 SOURCE APPROVAL AND QUALITY CONTROL 9.1 Supplier Requirements Suppliers must conform to the requirements of the International IQR Quality Standard which includes conformance to the QS-9000 (IS0 9001) Quality System Standard. A mutually acceptable Quality Control Plan as described therein is r
22、equired for source approval to the requirements of this specification. This document is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 02002
23、International Truck and Engine Corporation. APRIL 2002 Page 3 of 4 Copyright International Truck and Engine Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NUMBER: CEMS G-19, Pt. 111 PART III 9.2 Approval Parts s
24、upplied against contracts or purchase orders citing this specification shall be equivalent in all respects to those samples that were approved by the purchaser. No changes in formulation or processing practices are permitted without approval. In the event that changes in material, properties, proces
25、sing practices, construction, color, or labeling of the product are required, the supplier shall notify Materials Engineering at TDTC and International Purchasing and Supplier Development of the proposed change(s). Test data indicating conformance to all requirements of this specification, test samp
26、les, 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. TITLE: CURRENT ISSUE DATE: Nickel-Nickel/Chromium-Chromium Plating April 2002 9.3 Process Control The supplier shall either perform and
27、report results of tests on specific lots of parts produced 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 plant metallurgist and/or the quality control manage
28、r of the using International plant may determine testing and reporting requirements on specific products. 10.0 DESIGNATION ON DRAWINGS AND PURCHASE ORDERS The designation of coating types and classes for standard parts is described in the International Engineering Standard Parts Books. 10.1 For part
29、s that are not included in the Engineering Standard Parts Book, The electroplated coating will be designated on drawings and purchase orders as follows: Examples: Dull Chromium, Class SCRD, CEMS G-19, Part III Bright Nickel, Class SNIB, CEMS G-19, Part III 10.2 If the part to be plated is considered
30、 susceptible to failure because of hydrogen embrittlement, the drawing should specify “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 som
31、e applications of industrial plating, it may be desirable to bake both before and after plating. 11.0 SHIPPING AND PACKING Shipping, packing and identification shall be in accordance with Manufacturing Standard D-13. This document is restricted and may not be sent outside International Truck and Eng
32、ine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 02002 International Truck and Engine Corporation. APRIL 2002 Page 4 of 4 Copyright International Truck and Engine Corporation Provided by IHS under license with
33、 INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I INTERNATIONAL TRUCK and ENGINE CORPORATION I NUMBER: CEMS G-19, PART I, II, the use of these fasteners should be confined to interior applications only. CURRENT ISSUE DATE: April 2002 A.5 CORROSION TESTING Th
34、e neutral salt spray test has generally been discredited as a satisfactory corrosion test for decorative nickel/chromium plating. It is satisfactory for determining the porosity of chromium on steel, however, the MN-Porotest paper or the Ferroxyl test are quicker and equally accurate. A.6 HYDROGEN E
35、MBRITTLEMENT Hydrogen embrittlement is a term used to describe the phenomenon that OCCUTS due to absorption of atomic or protonic hydrogen during processing. This causes either a loss in load carrying ability or a reduced capacity for slow plastic strain. Constant load ”delayed fracture” tests are a
36、 sensitive means of quantifying the effect. Minute amounts of hydrogen can have significant effects. There is no universal agreement on the mechanism involved. Contrary to the usual effect of embrittlement, effects of hydrogen decrease with increasing strain rate. The phenomenon is most pronounced a
37、t intermediate temperatures, but is less apparent at high and low temperatures. A.6.1 The only practical way to remove absorbed hydrogen is to heat the plated parts at a temperature sufficiently high and for a period of time sufficiently long to remove the hydrogen. The time and temperature depend o
38、n 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 hydrogen embrittlement . A.6.2 A temperature of 400F (205C) for 4 hours has been found suitable in some instances; however, high
39、er temperature and/or longer time may be found necessary. Hardened parts which have been tempered at less than 350F (175C) should be heated at 300F (150C) for at least 8 hours. Suitable relief of hydrogen embrittlement of highly stressed spring steel parts is considered doubtful. A.6.3 Hydrogen can
40、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. Use of shot peening or grit blasting instead of acid cleaning will eliminate the absorption of hydrogen durin
41、g the cleaning operation. This document is restricted and may not be sent outside International Truck and Engine Corporation or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 02002 International Truck and Engine Corporation. Copyright International Truck and Engine Corporation Provided by IHS under license with INTERNNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
