Abstract：Nickel-based 693 alloy is formed by adding 3%-4% (mass fraction,similarly hereinafter) aluminum in 690 alloy to improve the corrosion resistance of the material.The upper limit of the original calibration curve of Al configured by the spark discharge atomic emission spectrometer in laboratory at the time of delivery is 0.87%,which cannot meet the analysis requirements of nickel-based 693 alloy.In the experiments,a series of standard samples and self-made standard samples were used to extend the calibration curve the upper limit of calibration curve to 4.50%, realizing the determination of aluminum content in 693 alloy.The methods for sample surface treatment were discussed.It was found that the precision of measurement data could be significantly improved when the sample was cleaned with alcohol after fine grinding.The working conditions of the instrument were optimized and the interference of coexisting elements was corrected.The argon flushing time was 7 s,the precombustion time was 13 s,and the integration time was 9 s.The contents of aluminum in two nickel-based 693 alloy samples were determined according to the experimental method,and the measurement value was 0.64% and 3.05%, respectively.The relative standard deviation (RSD,n=10) of the measured results was 0.45% and 0.39%,respectively.The analysis results of 3 nickel-based 693 alloy samples (the measurement value was 0.68%,2.95% and 3.18%) were selected for t test.The statistical results of t were all less than the critical values,indicating that the precision of the measured results were good.
戴红林, 刘满雨, 王庆江, 陈燕, 诸葛福乾, 张碧莹. 火花放电原子发射光谱法测定镍基693合金中铝的校准曲线拓展[J]. 冶金分析, 2023, 43(7): 90-95.
DAI Honglin, LIU Manyu, WANG Qingjiang, CHEN Yan ZHUGE Fuqian, ZHANG Biying. Extension of calibration curve for determination of aluminum in nickel-based 693 alloy by spark discharge atomic emission spectrometry. , 2023, 43(7): 90-95.
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