激光光谱原位统计分布分析技术测定汽车板表面线状缺陷中异常元素

Determination of abnormal elements of linear defects of automobile body sheets by laser induced breakdown spectroscopy-original position statistic distribution analysis technique

用激光光谱原位统计分布分析方法(LIBSOPA)获得汽车板表面线状缺陷样品元素分布的信息。运用激光光谱定量分析、深度扫描和一维表面线扫描结合的方法得到缺陷部位和非缺陷部位的元素含量信息,然后与实际样品位置信息对应,从而得到垂直线状缺陷方向各相关元素的分布分析数据。采用激光光谱原位统计分布分析方法获得的汽车板表面线状缺陷异常元素的数据与其他方法(扫描电镜,辉光光谱法)的分析结果相符。该方法具有激发斑点小、微损分析、原位分析等优点,尤其在分析镀层覆盖下的线状缺陷方面优势明显,可以用于汽车用薄板表面线状缺陷异常元素的甄别,为改进生产工艺提供了新的判据。

Laser-induced breakdown spectroscopy original position statistic distribution analysis technique（LIBSOPA） was used to obtain the element distribution of linear defects of automotive body sheets.The element content of defective and non-defective part was obtained by integrating laser spectroscopy quantitative analysis,in-depth scan and one-dimensional line scanning.The distribution analysis data of all elements of vertical linear defective direction was obtained by comparing the results with the actual position of sample.The data obtained by LIBSOPA conformed to the analysis results of other methods（scanning electron microscopy and glow discharge optical emission spectrometry（GDOES））.The method was featured with small excitation spot,microscopic damage analysis and in situ analysis advantages.The method has outstanding advantages for analyzing the linear defects covered by analysis coating in particular.It can be used to screen the abnormal elements of linear defects on the automotive sheet surface in order to provide new criteria basis for improving production process.