中文摘要：

基于激光诱导击穿光谱和 X射线能谱技术，测量了激光与油漆作用时发射光谱及作用前后元素成分的变化，以此研究了激光除漆的机理。实验测量了不同纳秒激光能量下激光诱导击穿油漆表面的光谱，计算了等离子体的电子密度和温度。通过扫描电子显微镜对油漆烧蚀形貌进行了分析，采用 X射线能谱仪测量了烧蚀前后油漆成分的变化。研究结果表明，等离子体电子密度、温度以及烧蚀区域大小都随着入射激光能量的增加逐渐增加。在激光作用前后油漆中碳（C）含量明显降低，原子百分比从78.25%降低到67.07%，说明激光与油漆作用过程中发生了烧蚀。通过对比钛（Ti）元素、C元素和铝（Al）元素的相对原子比例，表明更高的激光能量下油漆烧蚀的更剧烈。该工作对深入研究激光除漆机理有重要意义。

英文摘要：

The mechanism of laser paint removal is studied based on emission spectrum and composition analysis by using laser induced breakdown spectroscopy and X-ray energy spectrum technology.The electron density and electron temperature of the plasma was calculated with the LIBS spectrums with different laser parameters.The morphologies of ablated paint surface were analyzed with a scanning electron microscopy while the changes of paint composition before and after ablation were measured with an X-ray spectrometer.The results show that,the plasma electron density,temperature and ablation area gradually in-crease with the increasing of incident laser energy.The carbon （C）content in paint decreases from 78.25% to 67.07% after the laser irradiation,indicating the occurrence of the ablation in the process of laser paint removal.By comparing the content of tita-nium （Ti）elements,C element and aluminum （Al）,we found that the paint ablation will be more severe at higher laser energy. This paper is important to in-depth study of laser paint removal mechanism.