| DING Yaochen,WANG Mingdi,LUO Guifeng,ZHANG Xuan,TANG Yuqing.Effect Law of Laser Cleaning on the Subsequent Gluing Effect of Aluminum Alloy Surface[J],53(13):198-206 |
| Effect Law of Laser Cleaning on the Subsequent Gluing Effect of Aluminum Alloy Surface |
| Received:June 02, 2023 Revised:September 26, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.13.019 |
| KeyWord:laser cleaning aluminum alloy Dyne pen contact angle roughness |
| Author | Institution |
| DING Yaochen |
School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou , China |
| WANG Mingdi |
School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou , China |
| LUO Guifeng |
School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou , China |
| ZHANG Xuan |
School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou , China |
| TANG Yuqing |
School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou , China |
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| Abstract: |
| Laser cleaning is an efficient and environmentally friendly cleaning method. In order to meet the effective adhesion of the adhesive in the ISO 10365 fracture test, the aluminum alloy plate is required to have a certain surface energy after cleaning. In this work, the laser cleaning method was selected to carry out the test. The surface energy, contact angle, roughness and bonding force of aluminum alloy plate after laser cleaning were measured, and the effect of the adjustment of laser cleaning process parameters on the subsequent gluing effect was studied. 100 W pulsed laser was used to clean the surface of 5754 aluminum alloy plate, 44# Dyne pen was used to detect the surface tension of the sample, professional contact angle measuring instrument was used to measure the contact angle, confocal microscope was used to measure the surface roughness, and tensile testing machine was used to test the adhesion. Combined with the previous research on aluminum alloy cleaning, only the effect of laser frequency and scanning speed on the subsequent gluing effect of aluminum alloy was analyzed. The measurement results revealed that the surface energy of the original aluminum alloy plate was small, the contact angle was 93.736°, and the roughness Ra was 0.243 μm. In the case under a certain power of 100 W, when the laser cleaning frequency was between 50 and 200 kHz, to meet the requirements of Dyne pen detection, the aluminum alloy plate was hydrophilic, the contact angle was about 25°, and the roughness significantly increased. When the cleaning frequency was 300~1 000 kHz, it did not meet the requirements of Dyne pen, and the contact angle and roughness were close to the original. The scanning speed had little effect on the surface energy of the aluminum alloy plate, and the test results met the requirements of Dyne pen, and the surface was hydrophilic, and the rough friction significantly increased. It could be seen from the tensile test that the surface adhesive tensile force after laser cleaning was higher than the original surface tensile force. The aluminum alloy under the action of laser low-frequency cleaning could improve the adhesion of the adhesive, and changing the laser scanning speed could improve the adhesive adhesion of the aluminum alloy surface. The reason for the reduction of the contact angle after cleaning is that the wetting state of the aluminum alloy after laser cleaning is not stable and in order to reduce the surface system energy after cleaning, the solid-liquid interface area is reduced. The contact angle is reduced accordingly. Roughness is the main factor of the subsequent gluing effect of aluminum alloy. In the low-frequency cleaning state, the greater the roughness, the larger the surface contact area, the smaller the contact angle. In the laser cleaning frequency of 50~200 kHz, the contact angle change is not obvious, and the roughness has a change trend, due to the different spot overlap rate, resulting in different energy absorbed by the laser pit. When the cleaning frequency is 300~ 1 000 kHz, the laser energy density is reduced, which is not enough to change the surface energy and roughness of the aluminum alloy. The change of laser scanning speed on the wettability of aluminum alloy is not obvious. When the laser energy is large enough, the surface energy of aluminum alloy increases, and the surface is hydrophilic, and the roughness change is not obvious. Finally, it is concluded that the laser frequency is the main factor affecting the subsequent gluing effect of aluminum alloy when the laser power is fixed. The laser scanning speed has less effect. |
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