Abstract：Irregular conductive small samples were difficult to be analyzed by classical spark source optical emission spectrometry (Spark-OES) and glow discharge optical emission spectrometry (GD-OES). The depth and composition analysis of surface corrosion of two irregular small samples, i.e., the set screw of light emitting diode (LED) and printed circuit board (PCB) on circuit board were performed by laser-induced breakdown spectroscopy (LIBS). The depth curve indicated that the surface of pin sample of LED had coating elements such as Sn, Ni and Cu. The screw sample surface was covered by Ni. It was low alloy material under coating layer interface. The calibration curve was established by using a set of low alloy steel standard samples (GSBH40068-93). The content of C, Mn, P, S, Cu and Ni in iron-based sample under interface could be quantitatively analyzed. The screw sample of LED pin and PCB was very tiny, and the rusting on the surface was serious, so it was not suitable for wet chemical analysis. Under the same analysis parameter conditions, the accuracy and precision tests of middle-low alloy steel sample (No. 11278) were conducted by LIBS and Spark-OES. The results showed that, the accuracy of the two methods was consistent. However, the precision of LIBS data was slightly inferior to Spark-OES. Except for P and S, the relative standard deviations (RSD) of other elements were all less than 5%.
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