丁尧臣,王明娣,罗贵峰,章轩,汤雨晴.激光清洗对铝合金表面后续涂胶效果的影响规律研究[J].表面技术,2024,53(13):198-206.
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].Surface Technology,2024,53(13):198-206 |
| 激光清洗对铝合金表面后续涂胶效果的影响规律研究 |
| Effect Law of Laser Cleaning on the Subsequent Gluing Effect of Aluminum Alloy Surface |
| 投稿时间：2023-06-02 修订日期：2023-09-26 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.13.019 |
| 中文关键词: 激光清洗 铝合金 达因液 接触角 粗糙度 |
| 英文关键词:laser cleaning aluminum alloy Dyne pen contact angle roughness |
| 基金项目:国家自然科学基金(52375459);江苏省科技计划专项(BE2022066-3);苏州市重点产业技术创新-关键核心技术研发(SGC2021010) |
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| Author | Institution |
| DING Yaochen | School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou 215000, China |
| WANG Mingdi | School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou 215000, China |
| LUO Guifeng | School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou 215000, China |
| ZHANG Xuan | School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou 215000, China |
| TANG Yuqing | School of Mechanical and Electrical Engineering, Soochow University, Jiangsu Suzhou 215000, China |
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| 中文摘要: |
| 目的 研究激光清洗的工艺参数调整对表面后续涂胶效果的影响规律。方法 采用100 W脉冲激光器对5754铝合金板进行表面清洗，研究并分析激光频率、扫描速度对铝合金表面性能的影响。采用达因液检测试样表面能，并测量接触角、表面粗糙度及胶黏剂附着力。结果 在选定100 W功率的情况下，当激光清洗频率在50~200 kHz时，满足达因液检测要求，铝合金板呈亲水性，粗糙度明显增大，胶黏剂附着力大于原基材。当激光频率在300~1 000 kHz时，不满足达因液要求，表面接近疏水性，粗糙度变化不明显。扫描速度对铝合金板后续涂胶效果影响不大，试验结果均能满足达因液要求，且亲水角变化不明显，粗糙度均明显增大，胶黏剂附着力均大于原基材。结论 在功率一定的情况下，激光频率是影响铝合金后续涂胶效果的主要因素，其原因主要是改变了表面粗糙度，增大其润湿性。激光扫描速度的变化可以增大铝合金表面能，使其表面具有亲水效果，对于铝合金后续涂胶效果的变化影响较小。 |
| 英文摘要: |
| 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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