Organic-Coat-GMW-14670.pdf

WORLDWIDEGeneral Specification ENGINEERING GMW14670 Finish STANDARDS Organic Coat Finish for Steel Wheels confirmed by the supplier in writing and are part of 1 Introduction the initial sample approval. Note: Nothing in the standard supersedes The relevant suppliers as well as their material applicable laws and regulations. designations of the used pretreatments and materials shall be communicated. Note: In the event of conflict between the English and domestic language, the English language shall 1.3 Classification / Wheel Types. take precedence. 1.3.1 Type A. Single Coat System cathodic elpo 1.1 Scope. Organic coat finishes which ensure black (only wheels which are fully covered or spare adequate protection against corrosion on surfaces wheels). of road wheels. 1.3.2 Type B. Single Coat System acrylic elpo. Note: Some sections reference both, GMW test 1.3.3 Type C. Double Coat System (elpo, topcoat) methods and local test methods. As soon as the 1.3.4 Type D. Multi Coat System (e.g. elpo, base GMW is available, it supersedes the local test coat, clear coat) method. 1.2 Mission/Theme. This standard describes the 2 References properties of organic coat finishes which ensure Note: Only the latest approved standards are adequate protection against corrosion on surfaces applicable unless otherwise specified. of painted steel wheels. 2.1 External Standards/Specifications. Suitable systems may include the following: ASTM G152 SAE J1960 1.2.1 Single Coat System. Electropaint (epoxy or ASTM G153 SAE J2020 acrylic ELPO). 2.2 GM Standards/Specifications. Spare wheels and wheels that are fully covered (> 90 %) can be painted by epoxy elpo. Acrylic GME 60203 GM9511P elpo should be for wheels that are not fully covered GME 60410 GMW3059 and for this reason need higher UV-resistance. GME 60400 GMW3286 1.2.2 Multi-coat Systems. Double or multi coat GME 60402 GMW14333 systems (e.g. elpo and top coat or elpo, base coat GME 60403 GMW14334 and clear coat). GME 60407 GMW14700 The clear coat (powder or wet coat) shall be GMI 60266 GMW14829 resistant against light fastness, weathering and GM9163P GMW14873 chemicals. Acrylic paint for example is suitable. 2.3 Additional References. None. Note: The colored paint coat and the top coat (clear coat) of any multi-coat system when required 3 Test Preparation and Evaluation need only be applied to significant and/or visible surfaces as shown on the relevant engineering 3.1 Resources. drawing e. g. the disc outer, spoke recess and rim 3.1.1 Calibration. The test facilities and equipment flange. shall be in good working order and shall have a Note: The specific composition of the organic valid calibration label. coatfinish is not a part of the standard, however 3.1.2 Alternatives. Alternative test facilities and pretreatment, specific composition and minimum equipment may also be used. However, all film thickness of the organic coat finish shall be measuring variables as specified in this standard © Copyright 2007 General Motors Corporation All Rights Reserved May 2007 Originating Department: GME Specification Center Page 1 of 4 GMW14670 GM WORLDWIDE ENGINEERING STANDARDS shall be determined correctly with respect to its to the product/process, and to apply for a new physical definition. release. 3.1.3 Facilities. Apparatus as required by the If not otherwise agreed to the entire verification test appropriate test method. shall be repeated and documented by the supplier 3.1.4 Equipment. Equipment suitable for prior to start of delivery of the modified or changed measuring coating thicknesses based on eddy product. In some cases a shorter test can be current or ferromagnetic principles having an agreed to between the responsible GM accuracy of ± 2.0 µm. Department and the supplier. 3.1.5 Test Vehicle/Test Piece. Test pieces, 3.7.1 Test Results. With reference to this standard shape, dimensions and number of test pieces as the results shall be represented in a test report. specified in the appropriate test method. 3.7.2 Deviations from Test Procedure. 3.1.6 Test Time. According to the appropriate test Deviations from the requirements of the test method. procedures shall have been agreed upon. Such requirements shall be specified on component 3.1.7 Test Required Information. According to drawings, test certificates, reports, etc. the appropriate test method. 3.1.8 Personnel/Skills. According to the 4 Requirements and Procedure appropriate test method. 4.1 General. 3.2 Preparation. Tests according to paragraph 4.1.1 Pre-treatment. In order to meet the 4.4.7 to 4.4.11 are only applicable for the disc requirements of this standard it is necessary that outer. road wheels shall undergo suitable cleaning If test pieces cannot be prepared due to wheel followed by appropriate pre-treatment (e. g. multi- dimensions for the relevant tests, the supplier shall cation-phosphating with sufficient coating weight) deliver special test samples with the original before organic coat application. substrate (material) in dependence of the test but 4.1.2 Composition and Surface Condition. the original coat in any case. Wheels shall show no surface characteristics 3.3 Conditions. which impair corrosion resistance, e.g. burrs and/or 3.3.1 Environmental Conditions. According to welding deposits. Single coat systems of steel the appropriate test method. wheels (see paragraph 1.2.1) shall only be used in addition with wheel covers. Multi-coat systems 3.3.2 Test Conditions. According to the shall be triple-layer at least. Clear coat shall be appropriate test method. used for top coating. Double-layer types are only 3.4 Instructions. Not applicable. permissible for inflatable spare tires. 3.5 Data. Not applicable. 4.2 Organic Coat Requirements. 3.6 Safety. This standard may involve hazardous 4.2.1 The stoved coating shall be smooth and free materials, operations, and equipment. This method from any surface blemishes prejudicial to does not propose to address all the safety serviceability, appearance, or subsequent problems associated with its use. It is the processing. responsibility of the user of the method to establish 4.2.2 Coating Thickness. The coating thickness appropriate safety and health practices and shall be determined using an apparatus based on determine the applicability of regulatory limitations eddy current or ferromagnetic principles to within prior to use. ± 2 µm. 3.7 Documentation. Samples of components or Type A Type B Type C Type D material released to this standard shall be tested for conformity with the requirements of this Disk ≥ 18 µm (18…30) µm ≥ 18 µm ≥ 18 µm standard and approved by the responsible GM inner Department prior to the start of delivery of Tread ≥ 18 µm ≥ 18 µm ≥ 18 µm ≥ 18 µm production level components or materials. Disk Any change to the component or material, e.g., ≥ 18 µm (18…30) µm (40…80) µm ≥ 60 µm outer design, function, properties, manufacturing process Visible and/or location of manufacture requires a new areas rim ≥ 18 µm (18…30) µm (40…80) µm ≥ 60 µm release of the product. It is the sole responsibility flange of the supplier to provide the customer, unsolicited, with documentation of any change or modification © Copyright 2007 General Motors Corporation All Rights Reserved Page 2 of 4 May 2007 GM WORLDWIDE ENGINEERING STANDARDS GMW14670 4.3 Tests. 4.3.12 Resistance to Hot Water Immersion. 4.3.1 Scratch Resistance. According to Delamination test according to GME 60410. GME 60402 - Rating 1. In the as received condition 4.3.13 Weather Resistance. The test shall be only. performed optionally in following test equipments 4.3.2 Cross Hatch Test. According to paragraph 4.3.13.1, 4.3.13.2. or 4.3.13.3. GMW14829 - Rating 0 or 1, in delivery conditions, This test is not applicable for Type A. after salt spray fog testing (paragraph 4.3.3) and Requirements (unless otherwise specified by after delamination test (paragraph 4.3.12). personnel engineering): 4.3.3 Salt Spray Fog Testing. 336 h according to The surface finish shall show no significant GMW3286. deterioration such as change in surface No corrosion, except along the scribe line, blisters appearance, change in gloss, colour change or or any change of surface are allowed. Total other defects detrimental to serviceability, which corrosion creepback according to GM9102P shall cannot be removed by polishing. be 3 mm max. The evaluation of the creepback 4.3.13.1 Method. Test as performed with can be realized by blowing with compressed air or apparatus of Atlas SFTS, B.V. company: (CI-65A, by using adhesive tape. Slight rust is permitted but CI 4000 or CI 5000 Xenon-Arc-Weather-Ometer) shall not exceed 20 % of the length of the exposed or apparatus of ASTM G152 or ASTM G153 edges. (Carbon-Arc-Apparatus). 4.3.4 Scab-test. Scab test according to GM9511P • Inner- and external filter: Borosilikat (4 weeks). Corrosion creepback per GM9102P shall be < 6 mm in total. • Radiation exposure: 0.27 W/m2 (for Xenon-Arc) or 0.55 W/m2 (for Carbon-Arc) at calibration 4.3.5 Salt Spray Fog-Climate Testing. Type C point 340 nm. and D: GME 60203 - F - Grade 7, allowable total corrosion creepback according to GM9102P • Radiation energy: 1944 kJ/m2 should be 3 mm max. • continuous test cycle of 17 min light only, 3 min The test is not applicable for Type A and B. light and spray). The relevant surface of the test piece shall face 4.3.6 Impact Resistance. Impact resistance the light source during test. according o GME 60407 - 40 000 minimum / Total coat system. • Black panel temperature (during light only Note: This test is applicable only to the surface of period) of (+63 ± 3) °C. the disk outer. Sections from other areas are Tested after cooling down (+23 ± 5) °C. permissible only if the coat system is identical them of the disk outer. 4.3.13.2 Method. Test to SAE J2020 using QUV 4.3.7 Resistance to Stone Impact. Resistance to Cabinet (or equivalent) and UVB313 lamps. stone impact according to GMW14700. Cycle: 4 h condensing humidity at (+40 ± 1) °C and 4.3.7.1 Type A and B: None 8 h UV at (+80 ± 1) °C. 4.3.7.2 Type C and D: Test duration shall be 1000 h. Method A or B : Rating 8 (≥ GM 8) 4.3.13.3 Alternative Method. Similar types of Method C: Rating 8 (≥ GM 8) commercial apparatus meeting the requirements described above may also be used. 4.3.8 Abrasion Resistance. According to GME 60400 - 1.4 l/µm min. Note: If a supplier shall be able to prove a positive result of two years outdoor exposure the 4.3.9 Resistance to Cleaning Agents. According accelerated weathering test is not necessary. to GMW14334 / GMI 60266 - Rating 2. Accepted outdoor exposure locations are listed 4.3.10 Resistance to Fuel. According to below: GMW14333 - Rating 2. GME and GMNA: Exposure in Florida, 5° from 4.3.11 Resistance to Color Change. According to horizontal, facing south, black box, without heating GME 60403. (according to GMW14873 / GM9163P). 4.3.11.1 Type A and B: None GM Holden: Exposure in Allunga, Queensland, 4.3.11.2 Type C and D: No change on the surface Australia. 180 K Langleys, exposed due north 5° permissible. from horizontal (southern hemisphere). © Copyright 2007 General Motors Corporation All Rights Reserved May 2007 Page 3 of 4 GMW14670 GM WORLDWIDE ENGINEERING STANDARDS LAAM: Cruz Alta Proving Ground Exposure, 5° from horizontal, facing north, black box, without 7 Additional Paragraphs heating, 180 000 Langleys (according to 7.1 All parts or systems supplied to this standard SAE J1960). must comply with the requirements of GMW3059, Requirements (unless otherwise specified by Restricted and Reportable Substances for personnel engineering): Parts. No cracking, blistering or other surface destruction and no loss of adhesion. No appreciable change of 8 Coding System colour or gloss. This standard shall be referenced in other 4.4 Additional Requirements. Other additional documents, drawings, VTS, CTS, etc. as follows: requirements may be specified on the relevant Example: engineering drawings, material specifications, etc. “Painted silver L 127 to GMW 14670 - Type C” Where: 5 Provisions for Shipping Painted silver L 127 = Designation of coating Not applicable. GMW14670 = Standard 6 Notes Type C = Type to paragraph 1.3 6.1 Glossary. Not applicable. 9 Release and Revisions 6.2 Acronyms, Abbreviations, and Symbols. Not 9.1 Release. This standard originated in OCT 2005 applicable. replacing GME 00200 and 9984136. It was first approved by Global Materials Team in MAY 2006. It was first published in MAY 2007. © Copyright 2007 General Motors Corporation All Rights Reserved Page 4 of 4 May 2007