Analytical method for simultaneously determining percentages of aluminum, chromium, iron and silicon in aluminum chromium alloy

A technology of aluminum-chromium alloy and percentage content, which is applied in the field of chemical composition determination, can solve the problems such as the inability to measure the composition range, and achieves the effect of good application effect, accurate result and high precision

Inactive Publication Date: 2018-11-27
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
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Problems solved by technology

However, the existing analysis range cannot meet the analysis requirements of Al-Cr-Fe-Si in Al-Cr alloys. The photometric method disclosed in the prior art can directly measure chromium in Al-Cr alloys. , also disclosed that the redox titration method is used to measure the chromium content in the aluminum-chromium master alloy in the range of 2% to 3%, and the ferrous ammonium sulfate titration method is also used for the continuous determination of vanadium and chromium in the aluminum-vanadium-tin-chromium alloy. The main elements are aluminum, vanadium, tin, chromium, the determination range is: Al: 5.5% ~13.5%, Sn: 11% ~14%, Cr: 11% ~14%, V: 58% ~65%, these None of the methods can determine the analysis requirements of Al, Cr, Fe, and Si in aluminum-chromium alloys whose composition range is Al: 25%~35%, Cr: 65%~75%, Fe: ≤0.25%, Si: ≤0.25%, At present, there is no method or standard for the simultaneous determination of Al-Cr-Fe-S in Al-Cr alloys

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  • Analytical method for simultaneously determining percentages of aluminum, chromium, iron and silicon in aluminum chromium alloy

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preparation example Construction

[0030] The preparation of the iron standard solution is as follows: accurately pipette the iron standard stock solution in step 1 and place it in a volumetric flask, add water to the volumetric flask after adding hydrochloric acid to make it constant, and set it aside;

[0031] Silicon standard stock solution: mix silicon dioxide and anhydrous sodium carbonate into a platinum crucible and put it in a high-temperature furnace to melt, and keep melting in the platinum crucible for 15 to 20 minutes, cool, soak in warm water, wash the crucible and beaker with water for at least Transfer three times and set the volume to 1000mL to prepare a silicon standard stock solution containing 0.5mg / mL of silicon, store it in a polyethylene bottle, and wait for use;

[0032] The preparation of the silicon standard solution is as follows: use a pipette to accurately pipette the silicon standard stock solution in step 1 and place it in a volumetric flask, add hydrochloric acid, add water to the ...

Embodiment 1

[0040] Step 1, preparing iron standard stock solution, silicon standard stock solution, working curve blank solution, working curve standard solution and aluminum-chromium alloy liquid to be tested, wherein the specific preparation method of iron standard stock solution and silicon standard stock solution is as follows:

[0041] Iron standard stock solution: Weigh 1.0000g of high-purity metal iron into a 250mL beaker, rinse the beaker wall with water, add 100mL of hydrochloric acid with a mass concentration of 36.0% to 38.0%, heat and dissolve, place it at room temperature, and transfer the solution to 1000mL Make up to volume in a volumetric flask. Prepare an iron standard stock solution containing 1 mg / mL of iron for use;

[0042] The preparation of the iron standard solution is as follows: use a pipette to accurately pipette 5.00mL of 1.00mg / mL iron standard stock solution into a 100mL volumetric flask, add 10.00mL of hydrochloric acid with a mass concentration of 36.0% to ...

Embodiment 2

[0052] Adopt the method in embodiment 1 to measure Al, Cr, Fe, Si content in the aluminum-chromium alloy sample, and measured value is compared with design value, as shown in table 1:

[0053] Table 1 Determination of aluminum, chromium, iron and silicon content

[0054]

[0055] As shown in Table 1, the analysis errors of Al, Cr, Fe, and Si are all within the allowable error range of analysis, which shows that the detection method has accurate results and good application effect.

[0056] Can obviously observe by above-mentioned analysis, assay method of the present invention is mixed with working curve blank solution, working curve standard solution a, working curve standard solution by adding a certain amount of high-purity aluminum, high-purity chromium, iron standard solution, silicon standard solution b. Working curve standard solution c, under the premise of determining the working parameters of the inductively coupled plasma atomic emission spectrometer, select the ...

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Abstract

The invention relates to an analytical method for simultaneously determining percentages of aluminum, chromium, iron and silicon in an aluminum chromium alloy. The analytical method comprises the following steps: establishing a corresponding working curve according to an emission line intensity value and a concentration value of a standard solution for a plurality of working curves and acquiring amethod linear equation; determining a to-be-detected aluminum chromium alloy solution and acquiring the intensities of all the emission lines; adopting an inductively coupled plasma atomic emission spectrometer for automatically calculating the percentages of aluminum, chromium, iron and silicon in the aluminum chromium alloy according to the working curve. The analytical method provided by the invention solves the problems that the existing international standard and current journal method cannot simultaneously determine the contents of aluminum, chromium, iron and silicon in the aluminum chromium alloy and have more analytical steps, more reagent materials for analysis, long analysis period and low efficiency, also solves the problem that an internal standard method-inductively coupledplasma atomic emission spectroscopy analytical method for simultaneously determining aluminum, chromium, iron and silicon in the aluminum chromium alloy does not exist at present, and provides a reference basis for the production control and application of the aluminum chromium alloy.

Description

technical field [0001] The invention belongs to the technical field of chemical composition determination, in particular to an analysis method for simultaneously determining the percentage content of Al-Cr-Fe-S in Al-Cr alloys. Background technique [0002] As a raw material for smelting titanium alloys, aluminum-chromium alloys are used to smelt alloys with very different melting points of constituent elements. The pre-prepared intermediate alloy should be lower than the melting point of the elements to ensure the phase fusion of the added elements. Accurate determination of the content of each element in the alloy is of great significance to ensure the quality of the master alloy and improve the smelting performance of titanium alloy. [0003] At present, there are no national standards or industry standards for the simultaneous determination of Al-Cr-Fe-Si in Al-Cr alloys, and there are no reports. The only journal reports found are photometric and gravimetric methods, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/28
CPCG01N1/28G01N21/73G01N2001/2893
Inventor 杜米芳
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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