Combined method for measuring content of impurity elements and matrix element niobium in niobium-iron alloy

Abstract

The invention provides a combined method for measuring the content of impurity elements and a matrix element niobium in a niobium-iron alloy. The method comprises the following steps: digesting a sample at room temperature by concentrated hydrofluoric acid, concentrated nitric acid and concentrated hydrogen peroxide, thereby forming a to-be-measured solution; and respectively preparing series standard solutions comprising impurity elements and a niobium element, detecting the standard solutions by inductively coupled plasma atomic emission spectrometry, drawing an impurity element calibration curve and a niobium element calibration curve, measuring the to-be-measured solution by the inductively coupled plasma atomic emission spectrometry, and combining the measurement result with the calibration curves to obtain the content of the impurity elements and the niobium element in the niobium-iron alloy sample. The method has the advantages that the content of the impurity elements such as silicon, tantalum, tungsten, titanium, aluminum, copper, phosphorus, manganese, lead, tin and vanadium and the content of the matrix element niobium in the niobium-iron alloy can be simultaneously measured; the method is high in accuracy and reliability and has the characteristics of convenience in operation, rapidness, environment friendliness, low cost and the like.

Description

technical field [0001] The invention belongs to the field of detection and analysis of ferroniobium alloys, in particular, it relates to a joint determination of impurity elements (including silicon, tantalum, tungsten, titanium, aluminum, copper, phosphorus, manganese, lead, tin, vanadium, etc.) and matrix in ferroniobium alloys. Method for elemental niobium content. Background technique [0002] Generally speaking, ferroniobium is a precious alloy material with a wide range of applications. Ferroniobium is an important alloy additive in the iron and steel industry. Adding niobium is beneficial to improve the plasticity and corrosion resistance of stainless steel and heat-resistant steel. Adding niobium to structural steel can improve welding performance and increase strength, plasticity and prevent welds. Corrosion, adding niobium to high-temperature steel, tool steel and high-temperature alloys can improve the high-temperature strength, creep resistance and toughness of ...

AI Technical Summary

Problems solved by technology

[0003] At present, in the prior art, niobium and tantalum are mainly determined by paper chromatography gravimetric method, silicon by gravimetric method, phosphorus by molybdenum blue photometric method, titanium by chromotropic acid photometric method, tungsten by thiocyanate photometric method, EDTA Volumetric determination of aluminum, etc., that is, the determination of the above-mentioned 12 impurity elements and matrix elements one by one with 12 different chemical analysis methods, the operation is complicated, the inspection process is long, the consumption of chemical reagents and human resources is large, the inspection cost is high, and harmful chemical The use of reagents affects the health of operators and causes secondary pollution to the environment

In particular, the chemical analysis method is inefficient, and consumes a lot of personnel and time. Each of the 12 elements needs to be measured one by one using 12 analysis methods. It usually takes 3-5 hours to measure each impurity element, and it takes about 48 hours to measure niobium. use of hazardous chemicals

Images