1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW15487 Determining the Resistance to Abrasion of Organic Coating Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 1 of 5 1 Scope Note: Nothing in this standard supercedes applicable laws and regulations. Note: In the event of
2、conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This standard shall be used to determine the resistance to abrasion of paints, varnishes and other organic coatings which have been applied to metallic or rigid non-metallic substrates. 1.2 F
3、oreword. Not applicable. 1.3 Applicability. Organic coatings which have been applied to metallic or rigid non-metallic substrates. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. DIN EN 196-1 DIN EN ISO 11124-2 I
4、SO 3310-1 2.2 GM Standards/Specifications. GMW3221 2.3 Additional References. None 3 Resources 3.1 Facilities. 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 test facilities and equipment m
5、ay also be used. However, all measuring variables as specified in this standard shall be determined correctly with respect to their physical definition. 3.2 Equipment. 3.2.1 Suitable saw or shears for preparation of test pieces. 3.2.2 Suitable test rig for measuring coating thickness. 3.2.3 Test sie
6、ve to ISO 3310-1, 0.8 mm for test sand. 3.2.4 Abrasion test rig (see Figure A1). 3.2.5 Test Sand. Sand shall be conform to DIN EN 196-1, grain group (0.5 to 1.0) mm. The sand shall be sieved by a sieve as specified in 3.2.3. The retained material shall be selected for the testing sand that shall be
7、used in this standard. 3.2.6 Chilled Iron Grit. Chilled iron grit shall conform to DIN EN ISO 11124-2, grain class (4.0 to 5.0) mm. The following iron grit shall be used: Chilled iron grit DIAMANT angular, code GH-K, grain class (4.0 to 5.0) mm, from Eisenwerk Wrth GmbH smaller components shall be p
8、laced together and adhered to the test piece holder to make up the minimum side length. The test pieces shall be taken from the finished part. If it is impracticable, tests shall be conducted on Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleN
9、o reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15487 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 2 of 5 specially prepared test panels. These panels shall be prepared with the same coatings and correct layer thic
10、knesses as the finished part. For initial sample approval, arbitration purposes, and routine quality control, at least three (3) test pieces shall be tested. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applicable. 3.6 Personnel/Skills. Not applicable. 4 Procedure Abrasion resis
11、tance as determined by this test method shall be defined as a measure of the effect of sand/chilled iron grit falling from a defined height onto the inclined surface of the coating. A defined volume of sand/chilled iron grit falls through a tube onto the surface. This process shall be repeated until
12、 an area of 35 mm2 of the coating has been removed. The quantity of the needed sand/chilled iron grit must be measured. This value (in Liters (L) divided by the thickness (in microns (m) is the abrasion resistance of a coating. 4.1 Preparation. Test pieces shall be tested immediately after condition
13、ing to GMW3221 for periods as follows: For Oven-dried Organic Coatings: (24 to 30) h after coating and baking. For Air-dried Organic Coatings: (72 to 96) h after coating and drying. Parts From the Supplier: To be tested without conditioning, in the condition received. 4.2 Conditions. 4.2.1 Environme
14、ntal Conditions. Not applicable. 4.2.2 Test Conditions. Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. 4.3 Instructions. 4.3.1 The test shall be performed at a temperature of
15、(+23 5) C. Care shall be taken to ensure that the test piece has attained this temperature. 4.3.2 The coating thickness shall be determined to within 2 m. 4.3.3. The quantity of specific test sand used for the test shall be dictated by the thickness of the coating being tested as follows: 15 m coati
16、ng thickness 3.0 L 15 mL After sand has been used for 100 passes, it shall be discarded. The quantity of specific chilled iron grit for anti-chip testing with coating thickness 100 m is 2 L 10 mL (8200 40) g) Chilled iron grit shall be discarded after 25 passes. 4.3.4 Procedure. The test piece shall
17、 be assembled to the holding panel, which is subsequently mounted to the test apparatus such that the test piece lies at an angle of 45 and the vertical distance between the base of the guide tube and the test piece surface is 25.4 mm (see Appendix A, Figure A1). The guide tube shall be vertical and
18、 rigidly attached to the main frame of the apparatus. Test samples with a curvature radius (r) 100 mm shall be attached to the test device such that the contact point of the tangent running parallel to the support lies exactly on the axis of symmetry of the steel guide tube (see Figure 1). Copyright
19、 General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15487 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 3 of 5 Figure 1: Ho
20、lding Panel Key: 1. Steel Guide Tube 2. Tangent 3. Test Piece All of the prescribed volume (see 4.3.3) of the test sand/chilled iron grit shall be poured without interruption into the feed funnel and allowed to drop via the guide tube onto the surface of the test piece and subsequently be collected
21、in a suitable vessel. The collected test sand/chilled iron grit shall then be returned to the feed funnel and the process repeated until the abrasive effect of the test medium has removed an area of approximately 35 mm2 of the coating and the substrate is visible. The total volume of test medium req
22、uired shall be noted. 5 Data 5.1 Calculations. The abrasion resistance, expressed as liter test sand/chilled iron grit per micron of coating thickness, shall be calculated using the following equation: Where: ab = Abrasion resistance in L/m V = Volume test sand in L D = Coating thickness in m 5.2 In
23、terpretation of Results. With reference to this standard, the abrasion resistance shall be expressed as the arithmetic average of three (3) test results in liters per micron (L/m) rounded to the nearest 0.1 L/m. The individual values shall not deviate more than 10% from each other. 5.3 Test Document
24、ation. Not applicable. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15487 Copyright 2013 General Motors Company All Rights Reserved Ju
25、ne 2013 Page 4 of 5 6 Safety This standard may involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices
26、 and determine the applicability of regulatory limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. ISO International Organization for Standardization r Radius 8 Coding System This standard shall be referenced in other documents, drawings, etc., a
27、s follows: Abrasion Resistance to GMW15487 XX L/m Example: Abrasion Resistance to GMW15487 0.7 L/m Where: Abrasion Resistance = Designation GMW15487 = Test Procedure 0.7 L/m = Requirement 9 Release and Revisions This standard was originated in November 2006. It was first approved by the Global Mater
28、ials Team in December 2006. It was first published in January 2008. Issue Publication Date Description (Organization) 1 JAN 2008 Initial publication. 2 JUN 2013 Added chilled iron grit details and supplier; DIN EN ISO 11124-2. (Vehicle Systems-Paint Materials and Facilities) Copyright General Motors
29、 Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW15487 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 5 of 5 Appendix A Figure A1: Test
30、Rig Key: 1. Steel Guide Tube 5. Inner Diameter: 19 mm 2. Holding Panel for Support Test Piece Outer Diameter: 25 mm 3. Washer 6. Outer Diameter: 34 mm 4. M5 7. Outer Diameter: 210 mm 8. Baseplate Diameter: 500 mm, 12 mm Steel Thick Plate Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
