Method for measuring indissolvable nickel-base superalloy multielement content with microwave digestion ICP method

Abstract

The invention discloses a method for measuring the indissolvable nickel-base superalloy multielement content with the microwave digestion ICP method. According to the method, a sample is digested in a microwave digestion instrument with hydrochloric acid, the acidity of a sample solution and the acidity of a standard solution are stabilized with a sulfuric acid and phosphoric acid mixture, then citric acid is added to prevent high-valent metal ion hydrolysis, the content of a matrix is adjusted for the matching purpose, a standard solution curve is made finally, and a proper analytical line is selected for measurement on an inductive coupling high-frequency plasma atomic emission spectrometer. Due to the fact that the sample is digested by means of hydrochloric acid, pollution to a hydrofluoric acid eroding instrument by a quartz feeding system of the instrument is avoided, and then measurement accuracy can not be affected. Meanwhile, the acidity of the sample solution and the acidity of the standard solution are stabilized with the sulfuric acid and phosphoric acid mixture, then citric acid is added to prevent high-valent metal ion hydrolysis, the content of the matrix is adjusted for the matching purpose, and therefore matrix effect is reduced.

Description

technical field [0001] The invention relates to a method for measuring the multi-element content of an insoluble nickel-based superalloy, in particular to a method for measuring the multi-element content of an insoluble nickel-based superalloy by a microwave digestion ICP method. Background technique [0002] At present, in terms of the means of detecting superalloy elements, inductively coupled plasma (ICP) emission spectrometer has been used since its introduction in 1975 because of its low detection limit, high precision, wide linear range of concentration determination, and small mutual interference between sample components. It has become an analytical method unmatched by other analytical techniques in the simultaneous determination of trace elements. [0003] The traditional sample pretreatment method for insoluble nickel-based superalloy analysis is: use hydrofluoric acid to dissolve the sample, and use nitric acid to adjust the acidity of the sample solution and stan...

AI Technical Summary

Problems solved by technology

However, hydrofluoric acid has a corrosive effect on the quartz sampling system of the inductively coupled high-frequency plasma atomic emission spectrometer, which is easy to pollute the instrument and affect the accuracy and repeatability of the measurement.

Moreover, the acidity of nitric acid sample solution and standard solution is used alone, which will easily lead to inconsistent acidity of the solution and affect the measurement results.

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