ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer) rapid determination method for contents of chromium and iron in nickel-based superalloy

Abstract

The invention relates to an ICP-OES rapid determination method for contents of chromium and iron in nickel-based superalloy, belongs to the technical field of chemical analysis test. The method comprises steps of dissolving pure nickel to serve as a matrix, adding different amounts of chromium and iron standard solutions to prepare a calibration solution, and adding an yttrium internal standard solution; simultaneously measuring the intensity ratio of the internal marking line of the internal standard element to the analysis line of the element to be measured in the calibration solution by using ICP-OES to make a calibration curve; dissolving a to-be-measured sample with nitric acid, hydrochloric acid and hydrofluoric acid, adding an yttrium internal standard solution with the same content as the standard solution, diluting with water to a fixed volume, introducing the solution into ICP-OES to measure the spectral line intensity of the to-be-measured element, and calculating the content of the to-be-measured element on the calibration curve. The calibration solution prepared by the method is similar to a sample solution in matrix, so that the matrix effect is eliminated; and a high-precision analysis instrument is used, so that the problems of complicated chemical analysis operation and low analysis speed are solved, and the method has the advantages of simplicity, rapidness, high accuracy, high precision and the like.

Description

technical field

[0001] The invention belongs to the technical field of spectral analysis, and in particular relates to an ICP-OES rapid determination method for chromium and iron content in nickel-based superalloys. Background technique

[0002] Nickel-based superalloys are superalloys with nickel as the matrix (generally more than 50%) in the range of 650-1000 °C with high strength and good oxidation resistance and gas corrosion resistance. Chromium and iron elements can improve the plasticity and strength of materials in alloys. The chemical composition of modern nickel-based alloys is very complex, and the saturation of the alloy is very high. Therefore, it is required to strictly control the content of each alloy (especially the main strengthening element), otherwise harmful phases will be easily precipitated during use and damage the alloy. Strength and toughness. Therefore, it is of great significance to determine the content of elements in nickel-based superalloys. ...

Examples

Embodiment 1

[0030] (1) Preparation of calibration solution:

[0031] Drawing of the calibration working curve matched with the nickel matrix: pipette 5.00mL nickel matrix solution into several 200mL plastic volumetric flasks, add appropriate amount of chromium and iron standard solutions according to Table 1, add 2.00mL yttrium internal standard solution respectively, and dilute with water To the mark, mix well; prepare a reagent blank along with the test solution.

[0032] Table 1 Nickel-based calibration working curve

[0033]

[0034] (2) Preparation of sample solution:

[0035] Weigh 0.2000g sample (see Table 2) into a 100mL polytetrafluoroethylene beaker, add 15mL of mixed acid of hydrochloric acid and nitric acid with a volume ratio of 1:3, add 0.5mL of hydrofluoric acid and heat slowly on a 45°C low-temperature electric heating plate dissolve. After the sample is completely dissolved, remove it, cool to room temperature, transfer to a 200mL volumetric flask, add 2.00mL yttriu...

technical field

[0001] The invention belongs to the technical field of spectral analysis, and in particular relates to an ICP-OES rapid determination method for chromium and iron content in nickel-based superalloys. Background technique

[0002] Nickel-based superalloys are superalloys with nickel as the matrix (generally more than 50%) in the range of 650-1000 °C with high strength and good oxidation resistance and gas corrosion resistance. Chromium and iron elements can improve the plasticity and strength of materials in alloys. The chemical composition of modern nickel-based alloys is very complex, and the saturation of the alloy is very high. Therefore, it is required to strictly control the content of each alloy (especially the main strengthening element), otherwise harmful phases will be easily precipitated during use and damage the alloy. Strength and toughness. Therefore, it is of great significance to determine the content of elements in nickel-based superalloys. ...

Examples

Embodiment 1

[0030] (1) Preparation of calibration solution:

[0031] Drawing of the calibration working curve matched with the nickel matrix: pipette 5.00mL nickel matrix solution into several 200mL plastic volumetric flasks, add appropriate amount of chromium and iron standard solutions according to Table 1, add 2.00mL yttrium internal standard solution respectively, and dilute with water To the mark, mix well; prepare a reagent blank along with the test solution.

[0032] Table 1 Nickel-based calibration working curve

[0033]

[0034] (2) Preparation of sample solution:

[0035] Weigh 0.2000g sample (see Table 2) into a 100mL polytetrafluoroethylene beaker, add 15mL of mixed acid of hydrochloric acid and nitric acid with a volume ratio of 1:3, add 0.5mL of hydrofluoric acid and heat slowly on a 45°C low-temperature electric heating plate dissolve. After the sample is completely dissolved, remove it, cool to room temperature, transfer to a 200mL volumetric flask, add 2.00mL yttriu...

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