Determination of chromium,molybdenum and niobium in nickel-based alloy Inconel 625 by inductively coupled plasma atomic emission spectrometry after microwave digestion
ZHANG Yan, SHEN Jian
Test, Analysis and Inspection Center, Baoshan Iron & Steel Co., Ltd., Shanghai 200941,China
Abstract：Nickel-based alloy Inconel 625 is one of the alloys with excellent corrosion resistance properties. Chromium, molybdenum and niobium are the main components, and can affect the product performance. Therefore, the accurate determination of chromium, molybdenum and niobium has important significance to the quality control of products. The sample was decomposed with hydrochloric acid, nitric acid and hydrofluoric acid by microwave digestion. The sample solution was diluted. Cr 267.716 nm, Mo 204.598 nm and Nb 210.942 nm were selected as the spectral lines. Y 371.029 nm was used as the internal standard line. The contents of chromium, molybdenum and niobium in nickel-based alloy Inconel 625 were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that the interference of coexisting elements in the sample could be ignored. The linear correlation coefficients of calibration curves of all elements to be measured were greater than 0.999 9. The proposed method was applied for the determination of chromium, molybdenum and niobium in actual sample of nickel-based alloy Inconel 625. The relative standard deviations (RSD, n=11) ranged from 0.23% to 0.54%. The contents of chromium, molybdenum and niobium in the standard sample of nickel-based alloy were determined according to the experimental method, and the found results were consistent with the certified values.
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