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Method for measuring 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, segregation, cost and expensive consumables, etc., and reduce the use of volume effect

Active Publication Date: 2020-04-03
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

The invention discloses a method for measuring the content of chromium in a vanadium-aluminum alloy. The method comprises the following steps: 1, the mass of the vanadium-aluminum alloy is m1; 2, crushing and powdering, and performing aerobic combustion; 3, adding a nitric acid solution into the combustion product, filtering, and taking the filtrate; 4, dropwise adding a hydrochloric acid solutionwith the mass concentration of 20% into the filtrate, and observing the color change in the beaker until the blue color in the beaker is not deepened any more after the hydrochloric acid solution iscontinuously dropwise added; 5, adding a silver nitrate solution and an ammonium persulfate solution into the beaker, and reading the volume h1 of the solution; 6, preparing a titration reagent; 7, titrating the chromium-containing solution by using a titrating reagent, and recording the titrating volume h2 of the titrating reagent; eighthly, calculating chromium content. According to the method,the sample is crushed and calcined, so that the chromium element can be fully dissolved in nitric acid and hydrochloric acid solutions, carbide can be discharged at high temperature in the calcining process, the use amount of sulfuric acid is reduced, and the method is convenient and quick through prepared reagent discoloration determination.

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