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 4 NAVISTAR, INC. Material, Parts, and Process Specificatio
2、ns (MPAPS) NUMBER: MPAPS G-23 Former Designation: CEMS G-23 TITLE: Tin-Zinc Plating CURRENT REV No.: 1412 DATE: Dec. 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: CEMS G-23 - December 2006 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REV
3、ISION 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 regul
4、atory limits prior to use. Change Notice: Converted specification from CEMS to MPAPS format; editorial changes. 1.0 APPLICATION Tin-zinc plating is intended for applications which require corrosion resistance and electrical conductivity, such as steel fasteners and small parts used for grounding app
5、lications. The coating is highly lubricious and provides excellent solderability for electrical applications. This type of coating is very ductile, so can be used for fasteners which require bending or crimping (such as blind rivets). Temperature of plated parts should not exceed 195C (380F) during
6、manufacture or service due to the low melting point of tin-zinc plating of 197C (386F). 2.0 SCOPE This specification covers the Corporations requirements for electrodeposited tin-zinc coatings on steel substrates, with a supplementary hexavalent-chromate-free passivation film. 2.1 Restricted Chemica
7、l 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 Specif
8、ications, Standards, and Regulations are referenced in this specification. Quality System Standard ISO 9001 or TS-16949 CFR Title 29, Part 1910 ASTM B117 NAVISTAR Manufacturing Std. MS-D-13 NAVISTAR Engineering Design Std A-16 NAVISTAR MPAPS B-50 4.0 REQUIREMENTS Parts to be plated will be thoroughl
9、y cleaned and free of rust, scale, oil and other foreign matter. The cleaning operation must be controlled to prevent hydrogen embrittlement, especially in those parts that are hardened, cold worked, or subject to high service stresses. 4.1 Chemical Composition Plating alloy composition will be in t
10、he range 65-80% tin, with balance zinc. NUMBER: MPAPS G-23 TITLE: Tin-Zinc Plating 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
11、 Navistar, Inc. DECEMBER 2014 Page 2 of 4 4.2 Passivation Treatments A hexavalent-chromate-free passivation treatment (or trivalent chromium passivation) will be applied to the plating. 4.3 Plating Thickness The minimum plating thickness on parts plated to this specification will be 8 m (not includi
12、ng the supplementary passivation treatment). Maximum thickness on threaded parts will be twice the minimum specified plating thickness, and is limited by the basic thread size and its associated tolerances. Coated fasteners must pass all appropriate thread Go gages for thread sizing. Threads may be
13、produced undersized prior to plating providing that the finished threaded part meets all mechanical property requirements specified for the part. 4.4 Corrosion Performance Parts plated according to the requirements of this specification will be capable of withstanding neutral salt spray testing for
14、1000 hrs. Parts shall show no white corrosion on significant surfaces after 48 hr exposure, and no red rust on significant surfaces after 1000 hrs testing. Significant surfaces for evaluation of fasteners will be defined as all exposed surfaces of fastener(s) when installed, including but not limite
15、d to fastener heads, socket recesses, SEMS washers, and external surfaces of nuts. Threads and points are excluded unless otherwise specified on drawing. On parts other than threaded fasteners, significant surfaces will include all plated surfaces. Deep recesses, blind holes, edges, and tubing inter
16、iors are excluded unless otherwise specified on drawing. 4.5 Adhesion The coating shall have good adhesion to the base metal. Plating will not blister, chip or flake during the adhesion tests as described in Section 5.3.4. 5.0 QUALITY The tin-zinc coating will be dense and uniform, free from porosit
17、y, pinholes and blisters, and substantially free from other defects that may affect the appearance or protective value of the coating. The plating will have no gray or burned area and will not flake off or develop “spotting out”. 5.1 Hydrogen Embrittlement All steel parts having core hardness greate
18、r than 32 HRC or surface hardness of 35 HRC and all highly stressed cold worked parts subsequently electroplated with tin-zinc are subject to embrittlement because of hydrogen absorption. For parts such as these, it will be the responsibility of the supplier to take appropriate process steps to prev
19、ent hydrogen embrittlement and to ensure that parts supplied to this specification are free of hydrogen embrittlement. Due to the low melting point of tin-zinc plating, parts requiring de-embrittlement bake shall be heated to a part temperature of 187C and held for 4 hrs min. 5.2 Sampling Procedure
20、Select for test one or more random samples from each shipment, or from authorized test specimens. The number of samples to be selected from each size lot will be agreed upon between the supplier and the purchaser. If results fall below the test requirements, the shipment may be rejected. NUMBER: MPA
21、PS G-23 TITLE: Tin-Zinc Plating 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 3 of 4 5.3 Metho
22、ds of Test 5.3.1 Chemical Composition Tin-zinc alloy composition will be determined using x-ray fluorescence spectroscopy. Other methods may be used with prior agreement between purchaser and supplier. 5.3.2 Plating Thickness Thickness of the tin-zinc coating will be determined on significant surfac
23、es (see Section 4.4) using x-ray fluorescence spectroscopy. Other methods may be used upon prior agreement between purchaser and supplier. 5.3.3 Corrosion Testing Corrosion performance will be determined on plated parts using the neutral salt spray test method per ASTM B117. 5.3.4 Adhesion Adhesion
24、of plating will be tested by subjecting plated parts to 175C for 30 minutes, followed by quenching in water. Tested parts will be inspected for blistering, chipping, or flaking. 6.0 QUALIFICATION Engineering qualification of sources is required in advance of production shipments. Suppliers shall sub
25、mit 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 appe
26、arance 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 the
27、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 purch
28、ase 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 can al
29、so 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. Thickness NUMBER: MPAPS G-23 TITLE
30、: Tin-Zinc Plating 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 4 7.2 Approval Parts sup
31、plied against 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 processing practices are permitted without approval. In the event that changes in material, properties, process
32、ing 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 indicating conformance to all requirements of this specification, test samples, and new o
33、r 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 results of tests on specific lots of parts produced using ISO 9001 or TS-16949 guidel
34、ines, 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 manager of the using NAVISTAR plant may determine testing and reporting requirements on s
35、pecific 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 to the appearance of the part. 9.0 DESIGNATION ON DRAWINGS Example of note to use on
36、drawings: Tin-zinc plating per MPAPS G-23 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-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/
