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Removal mechanisms of nanosecond pulsed laser cleaning of blue and red polyurethane paint

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Abstract

In this study, laser cleaning of blue and red polyurethane paint on aluminum alloy surface were investigated by using a nanosecond pulsed laser at 1.8, 3.2 and 8.0 J/cm2. The surface topography after laser cleaning was analyzed by confocal laser scanning microscope (CLSM) and field emission scanning electron microscopy (SEM), and the paint removal process was recorded by high-speed camera (HSC) and spectrophotometer. It was found that the cleaning results and phenomena of the two paints were significantly different. After cleaned at 1.8 J/cm2, the blue residual paint is a uniform and flat paint layer while the red residual paint presents a loose mesh morphology. Although both red paint and blue paint could be removed at 3.2 and 8.0 J/cm2, the surface of the substrate shows different topography. It could be observed by HSC that the blue paint detached from the substrate by being vaporized and the red paint was disintegrated into pieces and ejected from the substrate. This phenomenon was caused by the difference in the absorption coefficient of the two paints to the laser. To illustrate this, an energy distribution model was established considering Beer-Lambert’s law and the temperature distribution of paint and thermal stress of substrate were calculated. Under laser irradiation, blue paint was more likely to be ablated and vaporized, while red paint was subject to greater thermal stress. For blue paint removal, vaporization, spallation and combustion are the dominated mechanisms and the red paint was mainly erupted by thermal stress of substrate.

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Acknowledgments

This work is supported by the Guangdong Province Introduction of Innovative R&D Team (Grant No. 2018B090905003) and the National Natural Science Foundation of China (Grant No. U19A2077).

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Authors and Affiliations

  1. Key Laboratory of Micro-Systems and Micro-Structures Manufacturing of Ministry of Education, Harbin Institute of Technology, Harbin, 150080, China

    Donghe Zhang, Jie Xu, Zhichao Li, Debin Shan & Bin Guo

  2. School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China

    Donghe Zhang, Jie Xu, Zhichao Li, Yang Jin, Xuan Su, Debin Shan & Bin Guo

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  1. Donghe Zhang
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Correspondence to Jie Xu or Bin Guo.

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Zhang, D., Xu, J., Li, Z. et al. Removal mechanisms of nanosecond pulsed laser cleaning of blue and red polyurethane paint. Appl. Phys. A 128, 170 (2022). https://doi.org/10.1007/s00339-022-05296-4

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