Liu Hanqi, Dong Hang, Wang Tanghao, Lu Shanman, Zhang Wei
Appl Opt. 2024 Apr 20;63(12):3290-3298. doi: 10.1364/AO.516782.
In this paper, the theoretical model of laser cleaning of paint-rust mixed layer on the surface of a Q235 steel plate is established from the perspective of the laser ablation effect and the thermal vibration effect. The study simulates the temperature and stress field variations of the mixed layer under different laser power densities. The experiment recorded ablative fumes and vibrational spattering generated during the cleaning process and measured the micro-morphology and surface roughness of the cleaned specimens. The results show that the cleaning mechanism of the paint-rust mixed layer is dominated by the ablation effect at low laser power densities, while the combined effects of ablation and thermal vibration dominate at high laser power densities. However, excessive laser energy can damage the substrate. At a laser power density of 12.37×10 / , the substrate surface is free from contamination residues and exhibits a bright, white, metallic gloss, which can be determined as the cleaning threshold for laser cleaning of paint-rust mixed layers. This study provides a valuable reference for the laser cleaning of mixed pollutants of paint and rust on metal surfaces.
本文从激光烧蚀效应和热振动效应的角度，建立了Q235钢板表面漆锈混合层激光清洗的理论模型。研究模拟了不同激光功率密度下混合层的温度和应力场变化。实验记录了清洗过程中产生的烧蚀烟雾和振动飞溅，并测量了清洗后试样的微观形貌和表面粗糙度。结果表明，在低激光功率密度下，漆锈混合层的清洗机制以烧蚀效应为主，而在高激光功率密度下，烧蚀和热振动的联合效应起主导作用。然而，过多的激光能量会损坏基体。在激光功率密度为12.37×10 / 时，基体表面无污染物残留，呈现出明亮的白色金属光泽，可确定为漆锈混合层激光清洗的清洗阈值。该研究为金属表面漆锈混合污染物的激光清洗提供了有价值的参考。
