A kind of pure nickel metallographic etching solution and etching method thereof

Abstract

The invention provides a pure nickel metallographic corrosion solution and its corrosion method. The corrosion solution is prepared by mixing distilled water, concentrated nitric acid with a mass fraction of 65%-68%, and glacial acetic acid with a mass fraction of 99.5%. Describe the corrosion method of pure nickel metallographic corrosion solution, specifically comprise the following steps, pure nickel metallographic sample preparation, utilize the corrosion solution of above-mentioned preparation to carry out metallographic surface corrosion, utilize metallographic microscope to observe, through metallographic structure appearance and phase and grain boundary observation, and carry out metallographic structure analysis; the corrosion solution of the present invention is properly added some glacial acetic acid according to a strict proportion, and then mixed with appropriate acids and water, so that the metallographic sample after corrosion can obtain a very clear metallographic structure. phase structure, the corrosion solution of the present invention can quickly and efficiently corrode the metallographic structure of the sample. A clear metallographic structure can be observed in the corroded pure nickel metallographic structure, and there are obvious boundary lines and contrast between different phases.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a metal metallographic corrosion solution, in particular to a preparation and corrosion method of a pure nickel metallographic corrosion solution. Background technique [0002] Pure nickel is mainly used in military industry, aerospace, petrochemical industry, and marine industry. It has a wide range of uses, so its research history is relatively long. There are relatively few data. Metallographic detection and analysis is the basis of nickel material research. Through metallographic structure analysis, it can be observed whether the phase composition and grain size of the corroded sample are uniform, and non-metallic compound slag inclusions, pores, porosity, cracks, cracks, etc. can also be observed. Defects such as overburning can also be used to judge whether the product production process is perfect. Through metallographic analysis to help find the cause of product defects an...

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Problems solved by technology

If the corrosion solution is not selected properly, the metallographic structure of the sample will not be corroded; even if a suitable type of acid is selected, but the proportion of the preparation is too high, it is easy to form over-corrosion, the grain boundaries and grains are black, and no clear crystals can be observed at all. Grain boundary and grain size, and the contrast between phases cannot be observed. If the preparation ratio is too low, the grain boundary will not be corroded at all, and the microstructure will not be observed.

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