1、 ENGINEERING STANDARDS General Specification LIMITED USE EDS-T-7033 Protective Covering for High-Stressed Small Parts Do Not Use on New Program; No Replacement. Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: GM Korea Engineering Standards Page 1 of 3
2、Version : 3 1 Introduction Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the Korean and English language, the Korean language shall take precedence. 1.1 Purpose and Scope. In this test specification the requirements are determined,
3、which are set on a corrosion protection for small-and fixing parts, which must particularly be protected against corrosion. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. None 2.2 GM Standards/Specifications. ED
4、S-M-3106 EDS-M-3203 EDS-T-7143 EDS-T-7758 EDS-T-7759 GMW3059 2.3 Additional References. None 3 Test Preparation and Evaluation 3.1 Resources. 3.1.1 Calibration. The test facilities and equipment shall be in good working order and shall have a valid calibration label. 3.1.2 Alternatives. Alternative
5、test facilities and equipment may also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.1.3 Equipment. 3.1.3.1 Apparatus corresponding to the specified test method. 3.1.3.2 Measuring apparatus for coati
6、ng thickness (for example, according to Eddy-current principle or Ferro-magnetic) with a measuring accuracy of 2 . 3.1.4 Test Piece. Form, number and dimensions of the test piece are to be taken out from the specified test method. 3.2 Conditions. 3.2.1 Test Conditions. Deviations from the requiremen
7、ts of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 3.3 Safety. This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associ
8、ated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 3.4 Documentation. Samples of components or material released to this standard shall be tested for con
9、formity with the requirements of this standard and approved by the responsible GM Department prior to the start of delivery of production level components or materials. GM KOREA ENGINEERING STANDARDS EDS-T-7033 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 3 Versi
10、on : 3 Any change to the component or material, e.g., design, function, properties, manufacturing process and/or location of manufacture requires a new release of the product. It is the sole responsibility of the supplier to provide the customer, unsolicited, with documentation of any change or modi
11、fication to the product/process, and to apply for a new release. If not otherwise agreed to, the entire verification test shall be repeated and documented by the supplier prior to start of delivery of the modified or changed product. In some cases, a shorter test can be agreed to between the respons
12、ible GM department and the supplier. 4 Requirements and Procedure 4.1 Performance Requirements. 4.1.1 Build-Up. 4.1.1.1 Fundamental Layer. Zinc-coated to EZnP-B (EDS-M-3106). 4.1.1.2 Base Surface for Primer. Phosphated to EDS-M-3203. After phosphating min 5 of the zinc layer must still exist. 4.1.2
13、Burnable Zinc-Chrome Containing Primer. 4.1.2.1 Dry Film Layer Thickness. min. 20 . 4.1.2.1.1 Deviating from this all parts with spring characteristics or narrow slits can be dipping coated in one process, to make ease the later mounting. The layer thickness amounts to 7.5 to 15 . 4.1.2.1.2 Thread p
14、arts: Thread parts must be satisfactorily usable after manufacturing process. In the case of need the thread areas are protected against the coating. 4.1.2.1.3 Appearance: The primer film must be uniformly covered, free from cavities, contact points, bubbles etc. and may not show any edge retraction
15、. 4.1.2.2 Flexural Strength. The primer film must endure the normal bending, which occurs during the later assembling, without perceptible decrease of adhesive strength or crack formation. 4.1.2.3 Storage Property. The parts should endure the stresses usual for transport and storage without primer d
16、amage like rising, exfoliating or splintering. 4.1.2.4 Salt Spray Test to EDS-T-7143 240 hours - Grade 2. 4.1.2.5 Cross Hatch Test to EDS-T-7759-1B. 4.1.2.6 Scratch Resistance to EDS-T-7758-1B-GT 0. 4.1.2.7 Adhesive Strength. These adhesive strength tests are to be performed within of 8 to 10 min af
17、ter finishing the salt spray test to EDS-T-7143-144 hours. 4.1.2.7.1 If size and form of the finished parts do not admit of the cross hatch test to clause 4.1.2.5, the primer film is cut in X-shape. An adhesive tape is good pressed on with a rubber and sharply vertically pulled after 10 seconds. It
18、may not be lifted more than 10% of the area covered tape. The exposed areas may not show any corrosion product. 4.1.2.7.2 The primer film is parallely cut at intervals from 1.5 to 3.0 mm. With the gauge it is tested whether the film is lifted. The film should be lifted no more than 3 mm. 4.2 Further
19、 Requirements. 4.2.1 Further information, sees part drawings. GM KOREA ENGINEERING STANDARDS EDS-T-7033 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 3 Version : 3 5 Provisions for Shipping 6 Notes 6.1 Glossary. Not applicable. 6.2 Acronyms, Abbreviations, and Sym
20、bols. Not applicable. 7 Additional Paragraphs 7.1 All parts or systems supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: EDS-T-7033
21、9 Release and Revisions This standard was originated in February 1995. It was first approved by Engineering Standard Committee in February 1995. It was first published in February 1995. Issue / P9I8)Y Publication Date / 38 88 Description (Organization) / 9PP9I76 (:04.2P ) 3 NOV 2011 Apply new Engineering Standard Template. Limited use with no replacement (Polymer / Organic Material Lab Team) / 4 d3TE:4 64 957 . F9I957 ($4=E:4 68 ) =* (G)8*4G D4 )
