PDF(Pubmed)
Abstract：
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/cm2, 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.
摘要：
在这项研究中,使用波长为1064nm，脉冲宽度为100ns的脉冲激光从2024铝合金表面去除油漆。通过实验研究,分析了激光参数对飞机蒙皮表面漆层去除效果的影响,以及激光处理后铝合金基体显微组织的演变过程。通过模拟探索了激光清洗的机理。结果表明，功率密度和扫描速度显着影响清洁质量。值得注意的是,重复频率有明显的损伤阈值和最佳清洁参数，功率密度为178.25MW/cm2，扫描速度为500mm/s，40kHz的重复频率被确定为实现所需清洁效果的主要最佳设置。热烧蚀和热振动被确定为清洁的主要机制。此外，激光加工引起的表面位错和集中应力，伴随着晶粒细化，在铝基板上。
