提出了用X射线荧光光谱法测定镀锌钢板镀层(包括锌层、锌铁合金层、钝化层、磷化层和耐指纹层等)的质量。详细叙述了用于上述各层测定所需的系列标准样品的制备方法,分别通过对各不同层的特征组分的荧光强度进行测定,并根据校准曲线计算,分别得到各不同层的单位面积质量(g·m-2)。根据测定各不同组分时谱线荧光强度的强弱,选择不同的测量时间,试验选择直径为30 mm的测量面积。采用与样品相同类型的标准样品作校准曲线,重复10次测定6种镀层样品,其测定值的相对标准偏差在0.10%~0.32%之间。各镀层的测定值与重量法及电感耦合等离子体原子发射光谱法的测定值相比,经t-检验法验证(α=0.05),不存在显著差异。

XRFS was applied to the determination of mass of plating layer of galvanized steel sheets, including masses of Zn-layer, Zn-Fe alloy layer, Cr-bearing passivation layer, phosphorized layer, passivation layer without Cr and fingerprint proof layer. Preparation of series of standard samples used for the analysis was described in detail. In the XRFS analysis, the fluorescence intensities of the characteristic elements were measured and their masses per square meter (g·m-2) were found from the standard curves. Different time of measurements was chosen according to the magnitude of fluorescence intensity of spectrum of the respective elements determined, and an area with 30 mm in diameter was chosen for the measurements. Standard samples with similar composition should be used in the analysis. Samples of each of the above mentioned 6 layers were taken and replicate determinations were carried out, giving values of RSD′s (n=10) in the range from 0.10% to 0.32%. Values of masses of plating layers found by the present method were checked by the gravimetric and ICP-AES methods, and no significant difference among the data was found as shown by the results of t-test (α=0.05).