| MENG Jia,GU Guo-rong,JIN Zhe-min,XU Rong-lei,QIN Xing-zu.Typical Appearance Defects Analysis of Aluminium Trim in Vehicle Door[J],46(4):119-125 |
| Typical Appearance Defects Analysis of Aluminium Trim in Vehicle Door |
| Received:October 29, 2016 Revised:April 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.04.020 |
| KeyWord:aluminum trim wiredrawing appearance defects handfeel paint peeling off white print edge corrosion |
| Author | Institution |
| MENG Jia |
FAW-Volkswagen Automotive Co., Ltd, Changchun , China |
| GU Guo-rong |
FAW-Volkswagen Automotive Co., Ltd, Changchun , China |
| JIN Zhe-min |
FAW-Volkswagen Automotive Co., Ltd, Changchun , China |
| XU Rong-lei |
FAW-Volkswagen Automotive Co., Ltd, Changchun , China |
| QIN Xing-zu |
FAW-Volkswagen Automotive Co., Ltd, Changchun , China |
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| Abstract: |
| The work aims to avoid such defects of aluminum trim indoor as handfeel paint peeling off, white prints and edge corrosion by analyzing the causes. Optical microscope and SEM were used to observe and measure the paint, base metal, and gap between the paint and the metal. The effects of different process parameters on the coating appearance and performance were studied based on production process simulation. The handfeel paint had a good adhesion when the varnish was baked at 160 ℃ for 30 min, and peeled off easily when the varnish was baked for 60 min. By simulating the production process, we found that white prints in same morphology of those present in failure parts were present in aluminum trim provided with the standing time of 2 h, 2 d, hot water wiping and temperature alternating, and the white prints disappeared after being baked at 75 ℃ for 5 min. For corroded failure parts, the gap between Al trim and chromed trim was 135 μm, the edges were rough, wiredrawing depth was 7.4 μm and the gap between the paint and Al substrate was large. However, for uncorroded qualified parts, the gap between Al trim and chromed trim was 17 μm, the edge was smooth, the wiredrawing depth was 2.2 μm, and the gap between the paint and the Al substrate was small. Long-term baking of the varnish will lead to a poor adhesion of the handfeel paint to the varnish. The white print may be jointly caused by short standing time, hot water wiping and temperature alternating. The edge corrosion of the Al trim may be caused by large gap between the Al trim and chrome trim, rough edge and deep wiredrawing. |
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