Method for detecting chromium content of high-chromium-content aluminum alloy based on titration analysis method

An analytical method, an aluminum alloy technology, applied in the field of chemical analysis, which can solve the problems of high price, limited use conditions, and inability to guarantee the accuracy of the results, and achieves the effects of simple operation, few interfering elements, and fast chemical reaction speed.

Inactive Publication Date: 2020-06-09
李岩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry (ICP) can determine the content of chromium, but need to use atomic absorption spectrometer and ICP spectrometer, these two instruments are expensive and limit the conditions of use
And because the chromium content exceeds the measuring range of the standard method, so also will reduce the sample weight in the measurement process, or reduce the volume of pipetting test solution in proportion, and add pure aluminum standard solution, also will maintain acidity, these The operation is prone to large errors, and the accuracy of the results cannot be guaranteed

Method used

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  • Method for detecting chromium content of high-chromium-content aluminum alloy based on titration analysis method
  • Method for detecting chromium content of high-chromium-content aluminum alloy based on titration analysis method
  • Method for detecting chromium content of high-chromium-content aluminum alloy based on titration analysis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Weigh 0.5000g of an aluminum alloy sample that does not contain manganese and place it in a reactor, add 20mL of sodium hydroxide solution into the reactor, and when the action is slow, add 10 drops of hydrogen peroxide dropwise into the reactor until the sample is completely dissolved Finally, heat on an electric furnace at 250°C to decompose hydrogen peroxide, remove the heat source, add 25mL of nitric acid to acidify the reactor after it cools down slightly, then add 20mL of sulfuric acid-phosphoric acid mixed medium, and then add 200mL of water for dilution. When the chromium ion is in a stable state, add 8 mL of oxidant to the mixed solution, add 5 drops of silver nitrate solution, and then add 5 drops of manganese sulfate solution, until the color of the mixed solution turns purple, heat and boil until the oxidant is completely decomposed, After cooling, add 5mL hydrochloric acid solution, continue heating and boiling for 7min after boiling, and cool the solution t...

Embodiment 2

[0073] Weigh 0.5000g of an aluminum alloy sample that does not contain manganese and place it in a reactor, add 20mL of sodium hydroxide solution into the reactor, and when the action is slow, add 10 drops of hydrogen peroxide dropwise into the reactor until the sample is completely dissolved Finally, heat on an electric furnace at 250°C to decompose hydrogen peroxide, remove the heat source, add 25mL of nitric acid to acidify the reactor after it cools down slightly, then add 20mL of sulfuric acid-phosphoric acid mixed medium, and then add 200mL of water to dilute. The trivalent chromium ion is in a stable state. Add 8 mL of oxidant to the mixed solution, add 5 drops of silver nitrate solution, and then add 5 drops of manganese sulfate solution. When the color of the mixed solution turns purple, heat and boil until the oxidant is completely decomposed. After cooling down slightly, add 5mL of hydrochloric acid solution, continue heating and boiling for 8 minutes after boiling, ...

Embodiment 3

[0080] Weigh 0.5000g of an aluminum alloy sample containing manganese and place it in a reactor, add 20mL of sodium hydroxide solution into the reactor, and when the action is slow, add 10 drops of hydrogen peroxide dropwise into the reactor, and wait until the sample is completely dissolved , heated on an electric furnace at 250°C to decompose hydrogen peroxide, remove the heat source, add 25mL of nitric acid to acidify the reactor after it cools down slightly, then add 20mL of sulfuric acid-phosphoric acid mixed medium, and then add 200mL of water to dilute, at this time the trivalent When the chromium ion is in a stable state, add 8 mL of oxidant to the mixed solution, then dropwise add 5 drops of silver nitrate solution, heat and boil until the oxidant is completely decomposed, after cooling slightly, add 5 mL of hydrochloric acid solution, continue to boil for 7 minutes after boiling, and cool the solution to room temperature;

[0081] 2) Titration

[0082] Titrate with ...

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Abstract

The invention relates to the technical field of chemical analysis. The invention particularly relates to a method for detecting the chromium content of a high-chromium-content aluminum alloy. The method comprises the steps of: dissolving the to-be-detected substance by adopting sodium hydroxide-hydrogen peroxide to form an alkaline mixed solution; acidifying the alkaline mixed solution; then adding a sulfuric acid-phosphoric acid mixed medium into the acidified mixed solution; dissolving chromium chloride in a mixed solution to enable trivalent chromium ions in the mixed solution to be in a stable state, adding an oxidizing agent into the mixed solution to oxidize trivalent chromium into hexavalent chromium, titrating hexavalent chromium through an ammonium ferrous sulfate standard solution, and calculating the chromium content in a to-be-detected substance according to the volume of the consumed ammonium ferrous sulfate standard solution. The method is high in chemical reaction speedand stable in reaction. When a large instrument condition is not provided and the mass fraction of the chromium element in the aluminum alloy is greater than 0.60%, the detection method is the simplest, most practical, rapider and safer detection method.

Description

technical field [0001] The invention relates to the field of chemical analysis, in particular to a method for detecting the chromium content of a high-chromium-containing aluminum alloy based on a titration analysis method. Background technique [0002] The chromium content in aluminum alloys is usually determined by the determination method for chromium content in Part 18 of the national standard GB / T20975.18-2008 Chemical Analysis Methods for Aluminum and Aluminum Alloys. The standard stipulates two methods for the determination of chromium content: one is extraction and separation-diphenylcarbazide spectrophotometry, the determination range of chromium content is 0.0001% to 0.60%; the other is flame atomic absorption spectrometry , The determination range of chromium content: 0.010% ~ 0.60%. [0003] There is another method to detect the chromium content in aluminum alloy, refer to the national standard GB / T20975.25-2008 Chemical Analysis Methods of Aluminum and Aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N1/28
CPCG01N31/16G01N1/28
Inventor 李岩
Owner 李岩
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