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Method for detecting content of chromium in stainless steel

A detection method, stainless steel technology, applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve problems such as interference, and achieve the effect of simple, accurate and simple test method, accurate and reliable measurement

Inactive Publication Date: 2015-07-01
ANHUI WAYEE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some interferences in the atomic absorption method. In order to accurately measure the content of chromium, nickel and molybdenum in stainless steel, it is necessary to optimize the detection method.

Method used

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  • Method for detecting content of chromium in stainless steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Weigh 0.1000-0.2000 g of the crushed stainless steel sample and add it to a 100 mL glass beaker;

[0015] (2) Use a pipette to pipette 5ml of concentrated hydrochloric acid, 2ml of concentrated nitric acid into the beaker, cover the clean evaporating dish on the beaker,

[0016] (3) Place the acid-added sample on a hot plate for heating and dissolving, during which a small amount of deionized water is added.

[0017] (4) When the sample is completely dissolved, take it down and cool it to room temperature. Use the wash bottle to rinse the residue from the evaporating dish into the beaker.

[0018] (5) After rinsing, transfer the sample solution into a 100ml volumetric flask, and dilute to volume with deionized water. This is the sample solution to be tested.

[0019] (6) Pipette 125ul from the sample solution into a 50ml volumetric flask, and use 1% ammonium nitrate to make it constant. The constant volume solution is the final test sample solution on the machin...

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Abstract

The invention discloses a method for detecting the content of chromium in stainless steel by the addition of proper matrix modifier. According to the method, 1% of ammonium nitrate solution is adopted to directly make up to the volume of a sample, the interference of elements such as iron, magnesium, aluminum and sodium can be eliminated, and the testing repeatability and the testing accuracy can be improved; a stainless steel standard substance is used for testing and verification, and the result is accurate; the method is suitable for testing the stainless steel sample and is also suitable for testing chromium in common metal materials.

Description

technical field [0001] The invention relates to element detection of stainless steel materials, in particular to a method for detecting chromium content in stainless steel. Background technique [0002] Stainless steel with high chromium and nickel content (such as grade 304, 316) is generally used to manufacture medical equipment, and its anti-corrosion performance directly affects the life safety of patients. The higher the chromium, nickel and molybdenum content, the better the anti-corrosion performance. Generally, 304 or 316 stainless steel is used, so it is very important to detect the content of chromium, nickel and molybdenum in stainless steel. There are many existing detection methods, including chemical titration method, spectrophotometry, flame atomic absorption method, inductively coupled plasma spectrometry and X-ray fluorescence spectrometry. The first two methods have a long measurement cycle, and the test process is tedious and polluted. The most important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/31
Inventor 李涛
Owner ANHUI WAYEE SCI & TECH CO LTD