Metallographic etching methods for high temperature alloy

Abstract

The invention discloses metallographic etching methods for high temperature alloy. A method comprises the steps of 1, for a high temperature alloy test sample which needs to be etched, carrying out rough grinding, fine grinding and polishing in sequence, thereby obtaining a primarily processed high temperature alloy test sample; 2, placing the primarily processed high temperature alloy test sampleinto an electrolytic etching tank on an electrolytic polishing etching device, and pouring water diluted sulfuric acid and phosphoric acid mixed solution into the electrolytic etching tank; and 3, setting the electrolytic polishing etching device according to preset electrolytic etching parameters, starting the electrolytic polishing etching device, etching the primarily processed high temperature alloy test sample placed into the electrolytic etching tank on the electrolytic polishing etching device, and finally obtaining etched high temperature alloy. According to the metallographic etchingmethod for the high temperature alloy disclosed by the invention, a good etching effect for the high temperature alloy can be ensured, pollution of an etching technology to an environment is reduced,and the method is beneficial for popularization and application and has important production and practice significance.

Description

technical field [0001] The invention relates to the technical field of alloy corrosion, in particular to a method for metallographic corrosion of superalloys. Background technique [0002] At present, superalloys are widely used in aerospace and biomedical fields because of their excellent corrosion resistance and wear resistance. The corrosion is clear and the structure is observed, and the electrolytic corrosion method is generally used to corrode it. [0003] However, in the process of electrolytic corrosion, it is still necessary to use chemical reagents to prepare a large amount of acidic or alkaline electrolytes. The concentration of these electrolytes is high, which will inevitably cause serious pollution to the ecological environment. For example, in the existing method, a mixed acid reagent of sulfuric acid (such as a sulfuric acid stock solution with a mass concentration of 98%) and phosphoric acid (such as a phosphoric acid stock solution with a mass concentratio...

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Problems solved by technology

[0003] However, in the process of electrolytic corrosion, it is still necessary to use chemical reagents to prepare a large amount of acidic or alkaline electrolytes. The concentration of these electrolytes is high, which will inevitably cause serious pollution to the ecological environment.

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