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Analysis method of magnesium content in aluminum alloy

An analysis method and technology of aluminum alloy, applied in the direction of chemical analysis by titration method, can solve the problems of increasing error in results, interfering with end point observation, etc., and achieve the effect of high accuracy, obvious end point, and environmental protection of reagents

Inactive Publication Date: 2015-08-12
淄博市新材料研究所
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] When EDTA volumetric determination of magnesium, the most commonly used indicator is chrome black T, but the disadvantage of this indicator is that there is some purple at the end point that interferes with the observation of the end point, which increases the error of the result

Method used

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  • Analysis method of magnesium content in aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0026] (1) Add 2g cast aluminum alloy ZL6 to 30mL1mol / L NaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 40 minutes, filter, and wash the filter cake with water;

[0027] (2) Dissolve the filter cake in 20mL of 0.2mol / L hydrochloric acid solution, add 10mL of combined masking agent, use ammonia buffer to adjust the pH of the solution to 9.5, and add 200uL of mixed indicator;

[0028] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from wine red to blue, which is the titration end point.

[0029] (4) According to the formula Calculate the mass fraction of magnesium in the aluminum alloy,

[0030] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0031] V—the volume of EDTA standard titration solution consumed by titration, L;

[0032] m 0 - the amount of sample to be weighed, g;

[0033] The results are shown in Table 1.

Embodiment 2

[0035] (1) Add 2g cast aluminum alloy ZL10-1 to 30mL1mol / L NaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 2h, filter, and wash the filter cake with water;

[0036] (2) Dissolve the filter cake in 20mL of 0.2mol / L hydrochloric acid solution, add 10mL of combined masking agent, use ammonia buffer to adjust the pH of the solution to 9.8, and add 200uL of mixed indicator;

[0037] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from wine red to blue, which is the titration end point;

[0038] (4) According to the formula Calculate the mass fraction of magnesium in the aluminum alloy,

[0039] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0040] V—the volume of EDTA standard titration solution consumed by titration, L;

[0041] m 0 - the amount of sample to be weighed, g;

[0042] The results are shown in Table 1.

Embodiment 3

[0044] (1) Add 2g cast aluminum alloy ZL13 to 30mL1mol / L NaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 3h, filter, and wash the filter cake with water;

[0045] (2) Dissolve the filter cake in 20mL of 0.2mol / L hydrochloric acid solution, add 10mL of combined masking agent, use ammonia buffer to adjust the pH of the solution to 9.8, and add 200uL of mixed indicator;

[0046] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from wine red to blue, which is the titration end point;

[0047] (4) According to the formula Calculate the mass fraction of magnesium in the aluminum alloy,

[0048] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0049] V—the volume of EDTA standard titration solution consumed by titration, L;

[0050] m 0 - the amount of sample to be weighed, g;

[0051] The results are shown in Table 1.

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Abstract

The invention relates to a method for analyzing the content of a magnesium element in an aluminum alloy. According to the method, an adopted mixing indication agent is chrome black T, alizarin yellow R, pinkish red and a solution of hydroxylamine hydrochloride, wherein a solvent is a mixed solution of a triethanolamine solution and ethanol. According to the method for analyzing the content of the magnesium element in the aluminum alloy, a used reagent is environment-friendly and has no pollution; the disadvantages of the chrome black T are overcome and a terminal is obvious; the color change of the indication agent is acute and the accuracy is high.

Description

technical field [0001] The invention relates to a method for analyzing magnesium element content in aluminum alloy. Background technique [0002] In general aluminum alloys, the content of aluminum accounts for more than 85%, accompanied by common elements such as copper, magnesium, zinc, titanium, iron, calcium, silicon, nickel, manganese and rare earth, etc., the production of aluminum-magnesium alloys conducts product quality control, and The control of magnesium element content is a very necessary means. The determination of magnesium in aluminum alloys usually uses EDTA complexometric titration, and now there are two relatively mature methods: copper reagent method and potassium cyanide method, potassium cyanide method, simple operation, fast analysis speed, and widely used. [0003] When the EDTA volumetric method is used to determine magnesium, the most commonly used indicator is chrome black T, but the disadvantage of this indicator is that there is some purple at t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16
Inventor 高学峰高志子
Owner 淄博市新材料研究所
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