Li Jinxuan, Yang Jianjun, Liu Jiaxuan, Chen Hui, Duan Yunfei, Pan Xinjian
College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.
Materials (Basel). 2024 May 17;17(10):2414. doi: 10.3390/ma17102414.
In this study, a pulsed laser operating at a wavelength of 1064 nm and with a pulse width of 100 ns was utilized for the removal of paint from the surface of a 2024 aluminum alloy. The experimental investigation was conducted to analyze the influence of laser parameters on the efficacy of paint layer removal from the aircraft skin's surface and the subsequent evolution in the microstructure of the laser-treated aluminum alloy substrate. The mechanism underlying laser cleaning was explored through simulation. The findings revealed that power density and scanning speed significantly affected the quality of cleaning. Notably, there were discernible damage thresholds and optimal cleaning parameters in repetitive frequency, with a power density of 178.25 MW/cm, scanning speed of 500 mm/s, and repetitive frequency of 40 kHz identified as the primary optimal settings for achieving the desired cleaning effect. Thermal ablation and thermal vibration were identified as the principal mechanisms of cleaning. Moreover, laser processing induced surface dislocations and concentrated stress, accompanied by grain refinement, on the aluminum substrate.
在本研究中，使用了波长为1064 nm、脉冲宽度为100 ns的脉冲激光从2024铝合金表面去除油漆。进行了实验研究，以分析激光参数对从飞机蒙皮表面去除漆层的效果以及激光处理后的铝合金基体微观结构后续演变的影响。通过模拟探索了激光清洗的机理。研究结果表明，功率密度和扫描速度对清洗质量有显著影响。值得注意的是，重复频率存在明显的损伤阈值和最佳清洗参数，功率密度为178.25 MW/cm、扫描速度为500 mm/s、重复频率为40 kHz被确定为实现所需清洗效果的主要最佳设置。热烧蚀和热振动被确定为主要的清洗机制。此外，激光加工在铝基体上引起了表面位错和集中应力，并伴随着晶粒细化。
