What are the basic methods for chemical composition inspection of metal materials?

Date：2023-01-11 15:25:00 Views：701

There are various methods to analyze the chemical composition of substances. When it is necessary to test the chemical composition of substances for research or other reasons, professional inspection institutions will use professional means and instruments to analyze. Therefore, the standard stipulates the chemical composition that must be guaranteed for most metal materials, and some even serve as the main quality and variety indicators. Chemical composition can be analyzed and identified by chemical and physical methods. At present, chemical analysis and spectral analysis are the most widely used methods. In addition, the spark identification method with simple equipment and fast identification speed is also a practical and simple method for steel composition identification.

Chemical analysis method: determine the composition of metal according to chemical reaction. This method is collectively called chemical analysis method. Chemical analysis is divided into qualitative analysis and quantitative analysis. Through qualitative analysis, we can identify which elements are contained in the material, but we cannot determine their content; Quantitative analysis is used to accurately determine the content of various elements. Quantitative analysis is mainly used in actual production. The quantitative analysis methods are gravimetric analysis and volumetric analysis.

Gravimetric method: use appropriate separation means to separate the element to be measured from other components in the metal, and then use the weighing method to measure the element content.

Volumetric analysis: use standard solution (solution with known concentration) to completely react with the measured element in the metal, and then calculate the content of the measured element according to the volume of the consumed standard solution.

Spectral analysis method: various elements can produce their own unique spectra under the excitation of high temperature and high energy. The method to determine the chemical composition and approximate content of metals according to the characteristic spectra generated after the excitation of elements is called spectral analysis method. The sample is usually excited by external energy sources such as electric arc, electric spark and laser to make the measured element emit characteristic spectrum. After spectroscopic analysis, it was compared with the spectral table of chemical elements.

Spark identification method: It is mainly used to identify the chemical composition (constituent elements) and approximate content of materials by the difference in the number, shape, bifurcation, color, etc. of sparks generated by the oxidation of various elements and particles due to friction and high temperature under grinding wheel.

The above is an introduction to the basic methods of chemical composition inspection of metal materials. If you have any need in this respect, please consult! Of course, there are other methods for chemical composition analysis of metal materials. Here are just a few very common methods. Chemical composition is the main factor that determines the performance and quality of metal materials. Therefore, the standard stipulates the chemical composition that must be guaranteed for most metal materials, and some even serve as the main quality and variety indicators.