Abstract：In order to characterize the coating phase for zinc-aluminum-magnesium coating automobile sheet, and further guide the process adjustment and optimization in production field, the testing parameters were firstly optimized by X-ray diffractometer (XRD). Then the composition of the coating phase in zinc-aluminum-magnesium coating automobile sheet with seven different coating mass was qualitatively and quantitatively analyzed based on the obtained optimum testing parameters. The results showed that the optimum testing parameters for XRD phase analysis of zinc-aluminum-magnesium coating were as follows: small angle glancing incidence mode, narrow slit, step length of 0.02°-0.04°; the scanning speed was not higher than 2°/min, and the scanning angle was in range of 40°-51.5°. From the analysis of the zinc-aluminum-magnesium coating samples with seven different coating mass, it was found that the phase composition was the same and composed of Zn, MgZn2 and AlMg4Zn11. When the coating mass was less than 50g/m2, the mass fraction of both MgZn2 and AlMg4Zn11 in coating phase increased firstly and then decreased with the increasing coating mass, but the difference was not significant. When the coating mass increased from 50g/m2 to 70g/m2, the mass fraction of Zn in coating phase decreased, while the mass fraction of both MgZn2 and AlMg4Zn11 increased; meanwhile, the increasing rate of MgZn2 was higher than that of AlMg4Zn11. Traditional XRD could be only used for the preliminary semiquantitative analysis. The optimization of instrumental parameters in experiments could enhance the semiquantitative precision of XRD, thus it could replace the conventional chemical method for quantitative analysis. The in-time understanding of composition in coating phase could provide the theoretical guidance for the optimization of coating process in production field.
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