Abstract：X-ray fluorescence spectrometry (XRF) is a near-sample surface analysis method. During the analysis of alloying elements in wrought aluminum alloy by XRF, the influences of sample surface state and the distribution of alloying elements in the matrix on determination should be considered. Specifically, the influences on determination include the sample surface state change caused by the grinding times with abrasive belt, the difference of metallographic structure (precipitated phase) in wrought aluminum alloy with different grades, and the difference of heat treatment process.2xxx, 5xxx, 6xxx and 7xxx wrought aluminum alloys were selected as the object of research. The influences of abrasive belt grinding times, precipitated phase type and heat treatment process on the determination of alloying elements were investigated and discussed. The following conclusions were obtained: (1) The sample was polished with 120-mesh zirconia abrasive belt. However, the surface state of the sample changed with the increase of grinding times. Due to the infinite thickness of alloying elements and the shadow effect of the sample surface, the light elements (Mg and Si) were greatly affected by the sample surface state, and the measured values gradually increased and tended to be stable with the increase of grinding times. But the measured values of medium and heavy elements (Cr, Fe, Ti, Mn, Cu and Zn) were basically not affected. Therefore, the abrasive belt should be passivated to be a stable state before use. (2) Total standard samples of wrought aluminum alloy in 4 grades were determined to prepare the calibration curves. It was found that the linear relationships of light elements (Mg and Si) were not ideal, while the linear relationships of the medium and heavy elements (Cr, Fe, Ti, Mn, Cu and Zn) were good, which were possibly caused by the different types of precipitated phase formed by alloying elements and the sampling volumes. It was suggested to classify the wrought aluminum alloy according to the grade during the measurement of light elements to eliminate the influence of precipitated phase type. (3) The determination of light elements was greatly affected by the size of precipitated phase, which was controlled by the heat treatment process. The size of precipitated phase in annealed state was larger than that in quenched state and quenched age state. Due to the influence of absorption effect of precipitated phase, the measured results of Mg in 7xxx aluminum alloy in annealed state was lower than that in quenched state and quenched age state. The influence of heat treatment process on Si was not discussed here because its content was relatively low. The measured values of medium and heavy elements (Zn, Cu, Cr, Fe, Mn, and Ti) were almost not affected.
张祥, 陆晓明, 张毅. X射线荧光光谱法测定变形铝合金中合金元素的影响因素探讨[J]. 冶金分析, 2023, 43(5): 10-16.
ZHANG Xiang, LU Xiaoming, ZHANG Yi. Discussion on influencing factor on determination of alloying element in wrought aluminum alloy by X-ray fluorescence spectrometry. , 2023, 43(5): 10-16.
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