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Determination method of magnesium content in aluminum alloy

A measurement method and aluminum alloy technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of poor complexation ability, poor masking effect, magnesium content, etc. Inaccurate and other problems, to achieve the effect of environmentally friendly reagents, accurate measurement results, and obvious end points

Inactive Publication Date: 2016-01-27
淄博市新材料研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are adverse effects such as easy to produce unpleasant odor and highly toxic reagents to human body and environmental pollution.
[0003] CN101251490A discloses a method for measuring magnesium content in aluminum alloys. The masking agent is a combination of sulfur-containing compounds, acetone cyanohydrin, β-aminoethanethiol, triethanolamine, tetraethylenepentamine, ethylenediamine, and hydrogen peroxide. However, these masking agents have strong complexing ability with aluminum and iron ions, and poor complexing ability with copper, zinc, nickel, manganese and rare earth ions, resulting in poor masking effect. Determination of magnesium content in aluminum alloys imprecise

Method used

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  • Determination method of magnesium content in aluminum alloy

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Experimental program
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Effect test

Embodiment 1

[0023] (1) Add 2g cast aluminum alloy ZL6 to 30mL1mol / LNaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 40 minutes, filter, and wash the filter cake with water;

[0024] (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 0.02g of chrome black T;

[0025] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from red to blue, which is the end point.

[0026] (4) According to the formula Calculate the mass percentage of magnesium in the aluminum alloy,

[0027] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0028] V—the volume of EDTA standard titration solution consumed by titration, L;

[0029] m 0 - the amount of sample to be weighed, g;

[0030] The results are shown in Table 1.

Embodiment 2

[0032] (1) Add 2g cast aluminum alloy ZL10-1 to 30mL1mol / LNaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 2h, filter, and wash the filter cake with water;

[0033] (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 pH=9.8, and add 0.02g of chrome black T;

[0034] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from red to blue;

[0035] (4) According to the formula Calculate the mass fraction of magnesium in the aluminum alloy,

[0036] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0037] V—the volume of EDTA standard titration solution consumed by titration, L;

[0038] m 0 - the amount of sample to be weighed, g;

[0039] The results are shown in Table 1.

Embodiment 3

[0041] (1) Add 2g cast aluminum alloy ZL13 to 30mL1mol / LNaOH solution, add 5mL10wt%H 2 o 2 , react at 50°C for 3h, filter, and wash the filter cake with water;

[0042] (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 0.02g of chrome black T;

[0043] (3) Titrate the solution obtained in step (2) with EDTA until the solution changes from red to blue;

[0044] (4) According to the formula Calculate the mass fraction of magnesium in the aluminum alloy,

[0045] In the formula: C—EDTA standard titration solution concentration, mol / L;

[0046] V—the volume of EDTA standard titration solution consumed by titration, L;

[0047] m 0 - the amount of sample to be weighed, g;

[0048] The results are shown in Table 1.

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Abstract

The invention relates to a method for measuring the content of a magnesium element in an aluminum alloy. A compound masking reagent adopts a triethanolamine solution of iminodisuccinic acid, dimercaprol and tetrasodium glutamate diacetate, and triethanolamine reacts with Al<3+> and Fe<3+> to obtain a stable complex under an acidic environment, the formed complex is colorless and easily soluble, the iminodisuccinic acid and Cu<2+>, Ca<2+> and Zn<2+> form a stable complex; tetrasodium glutamate diacetate is strong in complexing power with rare earth element ions; dimercaprol is strong in complexing power with nickel and manganese ions, and is poor in complexing power with other ions. Thus, the compound masking reagent formed by multiple components is used for performing complexing masking on each element except for the manganese ions in the aluminum alloy in a targeted manner, and thus the detection accuracy is improved. The method for measuring the content of the magnesium element in the aluminum alloy, provided by the invention, is accurate in measuring result, and remarkable in end point, and has the environmental-friendly effects in the used reagent without pollution.

Description

technical field [0001] The invention relates to a method for determining the content of magnesium element 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. However, there are adverse effects such as easy generation of unpleasant odor and highly toxic reagents on human body and environmental pollution. [0003] CN101251490A discloses a method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79
Inventor 高学峰吴洋
Owner 淄博市新材料研究所
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