Abstract：:Different metallographic structures are formed in aluminum alloys due to the content change and different heating processing technology of some alloying elements. The microscopic distribution is ununiform and the matrix effect is hardly corrected, resulting in the difficulty in establishment of calibration curves during the analysis of aluminum alloy samples by X-ray fluorescence spectrometry (XRF). The aluminum alloy chip sample was prepared to bead by fusion method to eliminate the matrix interference. The calibration sample series were prepared using standard samples of high-aluminum refractory material as well as high-purity oxides and standard solutions. The analysis method of aluminum, silicon, magnesium, iron, titanium, manganese, copper and zinc in aluminum alloy by XRF was established. The optimal sample preparation conditions were obtained in experiments: 8.000 0 g of lithium tetraborate was fused and coated on the wall of crucible as the protection layer; 0.200 0 g of aluminum alloy and 2.000 0 g of lithium carbonate were mixed uniformly. The crucible was transferred into electric furnace. The initial temperature for pre-oxidation was 600 ℃. The temperature was increased to 700 ℃ and kept for 120 min, and then increased slowly to 800 ℃. After taking out and cooling, about 0.045 g of ammonium bromide was added. The crucible was transferred into fusion furnace at 1 100 ℃ for 30 min in swing mode to prepare the uniform bead. The limit of detection for magnesium and silicon was 0.066% and 0.007 1%, respectively. The limits of detection for other elements were lower than that of silicon. The proposed method was applied for the determination of aluminum alloy chip samples, and the relative standard deviations (RSD, n=9) of determination results were between 0.31% and 11%. Six standard samples were determined according to the experimental method, and the found results were consistent with the certified values.
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