Method for determining content of aluminum in aluminum-lithium alloy

A measurement method, the technology of aluminum-lithium alloy, is applied in the direction of chemical analysis by titration method and the preparation of test samples, which can solve the problems of large error and high cost, and achieve the effect of sensitive discoloration, easy identification, and avoiding the inconspicuous end point

Inactive Publication Date: 2018-11-30
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The determination of aluminum ion content in aluminum-lithium master alloys can also be determined by methods such as atomic absorption spectrometry, atomic emission spectrometry and inductively coupled plasma spectrometry, but these determination methods require the purchase of expensive instruments and equipment
At present, there have been many reports on the determination of metal ion content by spectral methods. For example, CN 201510316702 discloses a method for measuring the content of trace aluminum ions in papermaking black liquor by ICP. First, concentrated nitric acid and hydrogen peroxide solution are added to papermaking black liquor. , carry out digestion until a transparent digestion solution is obtained, measure the content of aluminum ions in the transparent digestion solution with ICP, and calculate the content of trace aluminum ions in the papermaking black liquor; but there are certain defects in the above method, because the spectroscopic method is suitable for trace analysis , when used for constant analysis, the error is large, and these determination methods need to purchase expensive instruments and equipment

Method used

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  • Method for determining content of aluminum in aluminum-lithium alloy
  • Method for determining content of aluminum in aluminum-lithium alloy
  • Method for determining content of aluminum in aluminum-lithium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Accurately pipette 10.00mL of 0.05139mol / L ZnO reference solution (ie V 3 ) into the Erlenmeyer flask, add 10mL of NH with pH=10 4 Cl-NH 3 ·H 2 O buffer solution, 10 drops of chrome black T indicator, titrate with EDTA standard solution until the solution changes from wine red to azure, which is recorded as the end point, and the volume of EDTA standard solution consumed is recorded (measured in parallel three times, and its average value) is respectively: 9.60mL, 9.60mL, 9.59mL, then V 4 =9.60mL; calculated by formula 2 and formula 3, c=0.05393mol / L, f=0.96.

[0067] Accurately weigh 0.4871g (i.e. m) of a bright and clean aluminum-lithium alloy into a small crucible, place it in a boiling water bath, add a small amount of water to wet it, and then add HNO with a volume ratio of 1:1 3 Make it dissolve completely; heat and stir until slightly boiled, cool to room temperature, transfer to a 100mL volumetric flask, dilute with deionized water and constant volume, shake...

Embodiment 2

[0072] In the description of embodiment 2, the determination of the concentration c of the EDTA standard solution and the volume multiple f of the EDTA standard solution equivalent to the 1mL ZnO standard solution is referred to in the embodiment 1, and only the aluminum-lithium alloy in the present embodiment is described below pretreatment and titration analysis process.

[0073] Accurately weigh 0.5021 g (i.e. m) of a bright and clean aluminum-lithium alloy in a small crucible, place it in a boiling water bath, add a small amount of water to moisten it, and then add HCl with a volume ratio of 1:1 to completely dissolve it; heat and stir until Slightly boil, cool to room temperature, transfer to a 100mL volumetric flask, dilute with deionized water and constant volume, shake well to obtain the sample.

[0074] Accurately pipette 5.00mL sample into a 250mL Erlenmeyer flask, adjust its pH to 2~3, accurately add 20.00mL EDTA standard solution, boil for a few minutes, adjust the...

Embodiment 3

[0078] In the description of embodiment 3, the determination of the concentration c of the EDTA standard solution and the volume multiple f of the EDTA standard solution equivalent to the 1mL ZnO standard solution refer to the description in embodiment 1, and only the aluminum-lithium alloy in this embodiment is described below pretreatment and titration analysis process.

[0079] Accurately weigh 0.5217g (i.e. m) of a bright and clean aluminum-lithium alloy in a small crucible, place it in a boiling water bath, add a small amount of water to moisten it, then add HCl with a volume ratio of 1:1 to completely dissolve it; heat and stir until Slightly boil, cool to room temperature, transfer to a 100mL volumetric flask, dilute with deionized water and constant volume, shake well to obtain the sample.

[0080] Accurately pipette 5.00mL sample into a 250mL Erlenmeyer flask, adjust its pH to 2~3, accurately add 25.00mL EDTA standard solution, boil for a few minutes, adjust the pH to...

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Abstract

The invention discloses a method for determining the content of aluminum in an aluminum-lithium alloy. The method comprises the following steps: S1, wetting the surface of the aluminum-lithium alloy with water and then performing acid dissolution to obtain an alloy acid solution; S2, transferring the alloy acid solution to a volumetric flask with a volume of V1 and fixing the volume of the alloy acid solution so as to obtain a sample; S3, accurately taking a part of the sample as a titration stock solution, adjusting the pH value of the titration stock solution to 2-3, adding an excess EDTA standard solution, and then adjusting the pH value to 6-8 so as to obtain a titration solution; S4, adding a NH4Cl-NH3.H2O buffer solution and a chrome black T indicator into the titration solution, carrying out titrating with a ZnO reference solution until the solution abruptly turns pure blue from blue green, and recording the usage amount V of the ZnO reference solution V; and S5, calculating thecontent of aluminum in the aluminum-lithium alloy according to an equation 1. The determination method of the invention is fast and accurate, simple to operate, obvious in terminal point indication and low in analysis cost, and does not need expensive instruments and equipment.

Description

technical field [0001] The invention belongs to the technical field of alloy component analysis, and in particular relates to a method for determining the aluminum content in an aluminum-lithium alloy. Background technique [0002] Aluminum-lithium alloy is a low-density lightweight alloy with high elastic modulus, high specific stiffness and high specific strength. Studies have shown that every 1% (wt%) lithium added to the aluminum alloy can reduce the alloy density by 3%, while the elastic modulus can be increased by 6%, and can ensure that the alloy has a good hardening effect after quenching and artificial aging. Especially in the aerospace and aviation fields where quality is "preoccupied", aluminum-lithium alloys have become important structural materials for the new generation of aerospace vehicles due to their excellent performance. [0003] The chemical properties of lithium are very active. When melting aluminum-lithium alloys in the form of pure metal lithium, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/28
CPCG01N1/28G01N31/16
Inventor 李明珍王世栋刘忠叶秀深李权火焱吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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