Zhang, Tiangang; Liu, Tianxiang; Zhao, Shunsen; Zhang, Zhiqiang; Liu, Yanan; Zhong, Cuiying Source: SSRN, January 10, 2024;

Abstract:

To further elucidate the influence of cleaning mechanisms on the effectiveness of laser paint removal, this study conducted a comparative analysis between numerical simulations and experimental results for multipulse laser cleaning at three different Y-direction overlap rates. The results indicate that under the shielding effect of the laser plasma, the experimental removal depth is consistently lower than the numerical simulation results for the same laser parameters, and intermittent ablation craters are formed in certain regions of the cleaned surface. As the Y-direction overlap rate increases, the residual primer thickness gradually decreases, the deposition amount of topcoat colorant and functional oxides gradually increases, and the ablation behavior progressively strengthens. The thermal stress has little effect on the removal depth but can induce cracking in the residual primer and the exposed oxide film. The superposition of the remaining plasma will enhance the plasma impact and shielding effect. In the laser irradiation zone, the three cleaning mechanisms of ablation, thermal stress, and plasma impact are coupled and interact. In the nonirradiated zone, the plasma impact and its induced secondary ablation and thermal stress mechanisms are coupled and interact.

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