| LI Qiang,ZHAO Ziming,LIU Weijun,BIAN Hongyou,WANG Wei,WANG Huiru.Effect of Laser Paint Removal on Surface Quality of Aluminum Alloy Substrate[J],53(3):200-209 |
| Effect of Laser Paint Removal on Surface Quality of Aluminum Alloy Substrate |
| Received:January 07, 2023 Revised:May 06, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.03.020 |
| KeyWord:pulse laser aluminum alloy laser paint removal anodic oxide film surface damage surface hardness |
| Author | Institution |
| LI Qiang |
Shenyang University of Technology, Shenyang , China |
| ZHAO Ziming |
Shenyang University of Technology, Shenyang , China |
| LIU Weijun |
Shenyang University of Technology, Shenyang , China |
| BIAN Hongyou |
Shenyang University of Technology, Shenyang , China |
| WANG Wei |
Shenyang University of Technology, Shenyang , China |
| WANG Huiru |
Shenyang University of Technology, Shenyang , China |
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| Abstract: |
| This is an experimental and test analysis of the damage to an anodic oxide film on the surface of 2A12 aluminum alloy substrate after laser removal of the composite paint layer. The purpose of laser paint removal is to totally remove the paint layer without damaging the substrate surface. However, when excessive laser cleaning occurs, the anodic oxide film on the substrate surface is damaged. Since the anodic oxide film can be recreated, there is also a process where the laser removes the paint layer while also completely removing the oxide film, thus re-preparing the oxide film. The work aims to investigate the damage to the anodic oxide layer caused by laser paint removal and the removal process. Aluminum alloy samples were anodized and later coated with a composite paint layer. The laser power range was 500 W to 400 W, the laser scanning speed was 5.5 mm/s to 4 mm/s, the pulse width was 70 ns, and a square spot with a spot length of 1.5 mm was selected for the laser cleaning experiments. After the experiments, the surface morphology and cross-section of the cleaned samples were observed by OLYMPUS-DSX1000 super depth-of-field microscope, the cleaned surface was observed and the elemental content was measured by MIRA3 scanning electron microscope and energy spectrometer, and the microhardness of the cleaned sample surface was tested by HV-1000 Vickers hardness tester. It was found that by choosing appropriate laser parameters, the composite coating could be completely removed. When the laser power was too high or the laser scanning speed was low, over-cleaning occurred and the anodic oxide film on the cleaned surface could be damaged or even removed. With laser power of 450 W and scanning speed of 4.5 mm/s and laser power of 400 W and scanning speed of 4.5 mm/s, the anodic oxide film on the cleaned surface was damaged. At laser power of 450 W, 400 W and scanning speed of 4 mm/s, the composite paint layer as well as the anodic oxide film on the specimen surface could be completely removed. The average microhardness of the anodic oxide film surface after complete removal of the composite paint layer was about 211HV and 242HV, respectively. When the laser power was 500 W and the scanning speed was 5.5 mm/s, and when the laser power was 450 W and the scanning speed was 5 mm/s, the average Vickers hardness of the cleaned sample surface was about 168HV at laser parameters of 450 W and 4.5 mm/s. The microhardness of the surface anodized film is not affected during the laser removal of the composite paint layer, which can be completely removed by a laser process with suitable parameters. The anodic oxide film can be completely removed at high laser power or low scanning speed. It has also been found that over-cleaning can cause ablation damage, and elastic vibrational stripping of anodized film on aluminum alloy surfaces. When the anodized film is completely removed, the microhardness of the surface of the aluminum alloy substrate is similar to that of the raw material surface, and no hardening layer is produced. |
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