Method for displaying metallographic structure of platinum

Abstract

The invention relates to the field of microstructure analysis of metal materials, and in particular relates to a method for displaying a metallographic structure of platinum. The method comprises the following steps: taking a cubic platinum sample, selecting one surface as a metallographic observation surface, embedding and fixing the platinum sample, and enabling the metallographic observation surface of the platinum sample to cling to the bottom of an inlaying mold; taking out the inlaid platinum sample from the inlaying mold, grinding the metallographic observation surface of the platinum sample, and then polishing until the metallographic observation surface has no obvious scratches and pollution points; taking the polished platinum sample as a positive electrode and a graphite rod as a negative electrode, putting the platinum sample and the graphite rod into corrosive liquid composed of water, concentrated hydrochloric acid and hydrogen peroxide to be subjected to direct-current electrified corrosion for 2 min to 10 min, and the sample displaying the metallographic structure of platinum is obtained. The method is easy to operate, extremely high in efficiency, low in requirement for operators, good in repeatability of test results, high in reliability and very suitable for preparation of platinum phases in general laboratories, and due to the fact that aqua regia and potassium cyanide are not used, harm to human bodies and pollution to the environment are avoided.

Description

technical field [0001] The invention relates to the field of metal material microstructure analysis, in particular to a method for displaying the metallographic structure of platinum. Background technique [0002] The structure of the metal material determines the performance of the metal material. By observing the microstructure of the metal material, the relationship between the structure of the metal material and its processing technology can be analyzed, the quality of the metal material can be judged, the heat treatment process can be adjusted, and the product performance can be optimized. . Therefore, whether the metallographic structure of platinum can be clearly prepared becomes the basis of platinum research. [0003] Metal platinum has the advantages of high melting point, strong corrosion resistance and good thermoelectric properties, and is often used as a high temperature temperature measurement material. Due to the strong corrosion resistance of metal platinu...

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Problems solved by technology

[0006] ② Potassium cyanide is used for metallographic corrosion of platinum, but potassium cyanide is highly toxic and harmful to operators, so it is generally not considered to be used

Although this method can be applied in the process of metal corrosion of metal platinum, its disadvantages are also very prominent: 1) Heating to 110°C concentrated nitric acid and concentrated hydrochloric acid volatilizes seriously, producing a large amount of toxic and polluting gases; 2) Corrosion The concentration of the process solution is constantly changing, and it is not easy to control the corrosion rate; 3) It requires a special corrosion container, which is not suitable for promotion in the laboratory

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