Rapid detection method for copper content in stainless steel

A detection method and technology for copper content, applied in the field of chemical analysis, can solve the problems of inability to meet the requirements of on-site rapid qualitative and semi-quantitative identification work, high detection environment requirements, and expensive instruments. easy-to-see effects

Active Publication Date: 2012-11-28
SHANXI TAIGANG STAINLESS STEEL CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The detection or identification methods for copper-containing stainless steel mainly include spectrophotometry and direct reading spectroscopy (or portable spectroscopy). Quantitative Identification Work Requirements

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0031] 1. Use sulfuric acid: water = 5: 95 (volume ratio) solution as 1# solution;

[0032] 2. Mix the following three solutions in a volume ratio of 1:1:1 as the final color developer. The three solutions are: (1), ammonium citrate solution with a mass concentration of 50% ( As a masking agent), (2), PH=9.2 buffer solution (to control the acidity of the solution), (3), the ethanol (1+1) solution of dicyclohexyl oxalyl dihydrazone with a mass concentration of 0.1% (color development ).

[0033] The preparation method of the buffer solution of PH=9.2 is: dissolve 35 grams of ammonium chloride in 100 ml of water, then add 24 ml of ammonium hydroxide with a concentration of 15 mol / l, and dilute to 500 ml with water.

[0034] 3. Polish the surface of the stainless steel sample to be identified with sandpaper to remove the surface oxide layer and dirt to form a clean surface.

[0035] 4. Place a piece of white test paper with a size of 1.5cm×1.5cm here, and use a dropper to drip ...

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Abstract

The invention relates to a rapid detection method for copper content in stainless steel, which comprises the steps of electrolyte preparation, developer preparation, electrolytic reaction and color developing comparison. The method provided by the invention has the advantages of simple operation, acute phenomenon, easy observation, accurate and reliable result and low identification cost, and is suitable for semi-quantitative detection of copper-containing steel under various environment conditions. According to the simple operation, the stainless steel with more than 1.0% of copper content can be rapidly detected, and method is different from the method for detecting common austenitic stainless steel and austenite antibiosis stainless steel, and can be used for on-site screening and detecting the copper-containing stainless steel.

Description

technical field [0001] The invention specifically relates to a method for quickly identifying copper-containing stainless steel with a copper content of more than 1%, and belongs to the field of chemical analysis methods. Background technique [0002] Copper is a non-carbide forming element, which mainly forms a solid solution with iron in steel; usually, copper is a harmful element in steel, and when the content exceeds 0.3%, high-temperature copper embrittlement will occur during hot pressure processing, so most stainless steel To avoid the presence of large amounts of copper. However, in order to improve the acid corrosion resistance of austenitic stainless steel, 2% to 3% copper is often added as an alloying element in some stainless steels. [0003] In recent years, a new type of stainless steel—antibacterial stainless steel has been developed. It uses about 3.5% copper element in austenitic stainless steel to form a dispersed ε-Cu phase in the steel and has antibacter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 任维萍秦丽雁王珺赵泳仙高山
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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