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A kind of assay method of chromium content in vanadium aluminum alloy

A technology of vanadium-aluminum alloy and determination method, which is applied in chemical analysis by titration method, measurement device, preparation of test samples, etc., can solve the problems of chromium determination interference, influence on titanium alloy performance, cost and expensive consumables, etc., and achieve The effect of reducing usage

Active Publication Date: 2022-03-22
HUNAN ZHONGXIN NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of chromium element not only affects the grade and grade of aluminum vanadium alloy, but more importantly, it is easy to segregate at the grain boundary of titanium alloy after being brought in as an additive, which seriously affects the performance of titanium alloy.
Therefore, in the production of vanadium-aluminum alloys, the control of chromium is extremely important, and the presence of a large amount of vanadium in vanadium-aluminum alloys interferes with the determination of chromium. At present, the analysis and detection are mainly carried out by instrument ICP spectrometer, and its detection accuracy can reach 0.3 % or less, and the use of this method requires the purchase of an ICP spectrometer, which is expensive and consumables, and it is difficult for ordinary small and medium-sized enterprises to achieve
For the detection of chromium content in vanadium-aluminum alloys, under the premise of ensuring accurate determination results, especially for the detection of low-content chromium in vanadium-aluminum alloys, there is no good and economical chemical method to follow.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The assay method of chromium content in the vanadium-aluminum alloy of the present embodiment comprises the following steps:

[0023] Step 1, get vanadium-aluminum alloy sample, weigh, record its quality as m1 be 1000 grams;

[0024] Step 2, crushing and powdering the vanadium-aluminum alloy sample weighed in step 1, and putting it into a high-temperature burner for aerobic combustion to obtain a combustion product;

[0025] Step 3, adding the mass concentration equivalent to 10% of the combustion product quality in the combustion product of step 2 is 10% nitric acid solution, filters, and gets the filtrate;

[0026] Step 4, add the filtrate obtained in step 3 into the beaker, add dropwise the hydrochloric acid solution with a mass concentration of 20% in the beaker, observe the color change in the beaker, until the blue color in the beaker is no longer deepened until continuing to add the hydrochloric acid solution;

[0027] Step 5, add silver nitrate solution and amm...

Embodiment 2

[0038] The assay method of chromium content in the vanadium-aluminum alloy of the present embodiment comprises the following steps:

[0039] Step 1, get vanadium-aluminum alloy sample, weigh, record its quality as m1 be 1000 grams;

[0040] Step 2, crushing and powdering the vanadium-aluminum alloy sample weighed in step 1, and putting it into a high-temperature burner for aerobic combustion to obtain a combustion product;

[0041] Step 3, adding the mass concentration equivalent to 10% of the combustion product quality in the combustion product of step 2 is 10% nitric acid solution, filters, and gets the filtrate;

[0042] Step 4, add the filtrate obtained in step 3 into the beaker, add dropwise the hydrochloric acid solution with a mass concentration of 20% in the beaker, observe the color change in the beaker, until the blue color in the beaker is no longer deepened until continuing to add the hydrochloric acid solution;

[0043] Step 5, add silver nitrate solution and amm...

Embodiment 3

[0054] The assay method of chromium content in the vanadium-aluminum alloy of the present embodiment comprises the following steps:

[0055] Step 1, get vanadium-aluminum alloy sample, weigh, record its quality as m1 be 1000 grams;

[0056] Step 2, crushing and powdering the vanadium-aluminum alloy sample weighed in step 1, and putting it into a high-temperature burner for aerobic combustion to obtain a combustion product;

[0057] Step 3, adding the mass concentration equivalent to 10% of the combustion product quality in the combustion product of step 2 is 10% nitric acid solution, filters, and gets the filtrate;

[0058] Step 4, add the filtrate obtained in step 3 into the beaker, add dropwise the hydrochloric acid solution with a mass concentration of 20% in the beaker, observe the color change in the beaker, until the blue color in the beaker is no longer deepened until continuing to add the hydrochloric acid solution;

[0059] Step 5, add silver nitrate solution and amm...

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Abstract

A method for measuring chromium content in vanadium-aluminum alloys, comprising the following steps: 1. The mass of vanadium-aluminum alloys is m1; 2. Crushing and pulverizing, aerobic combustion; 3. Adding nitric acid solution to combustion products, filtering, and taking filtrate; 4. 1. Add the filtrate dropwise with a hydrochloric acid solution with a mass concentration of 20%, and observe the color change in the beaker until the blue color in the beaker is no longer deepened until the hydrochloric acid solution is added dropwise; 5. Add silver nitrate solution and ammonium persulfate solution to the beaker , read the volume h1 of the solution; six, prepare the titration reagent; seven, titrate the chromium-containing solution with the titration reagent, and record the titration volume h2 of the titration reagent; eight, calculate the chromium content. In the present invention, the chromium element can be fully dissolved in the nitric acid and hydrochloric acid solutions by pulverizing and calcining the sample, and the carbide can be discharged at high temperature during the calcining process, reducing the usage of sulfuric acid, and the discoloration measurement by the configured reagent is convenient and quick.

Description

technical field [0001] The invention relates to the field of chromium content detection, in particular to a method for measuring chromium content in vanadium-aluminum alloys. Background technique [0002] Vanadium-aluminum alloy is an important additive for the production of titanium alloys. The chemical composition content of its main elements and the content of chromium as an impurity element often need to be strictly controlled during the production process. The content of chromium element not only affects the grade and grade of aluminum vanadium alloy, but more importantly, it is easy to segregate at the grain boundary of titanium alloy after being brought in as an additive, which seriously affects the performance of titanium alloy. Therefore, in the production of vanadium-aluminum alloys, the control of chromium is extremely important, and the presence of a large amount of vanadium in vanadium-aluminum alloys interferes with the determination of chromium. At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/44G01N31/16G01N21/78
CPCG01N1/286G01N1/44G01N31/16G01N21/78
Inventor 张春雨
Owner HUNAN ZHONGXIN NEW MATERIALS TECH