Method for preparing electroformed nickel metallographic sample and displaying constitution

Abstract

A method for preparing electroformed nickel metallographic sample and displaying constitution belongs to the technical field of metallographic sample preparation. In the method, an electroformed nickel metallographic sample is put into a vacuum furnace for annealing at the temperature of 240-340 DEG C for 3-5 hours; then the sample is roughly ground and polished with 1mum and 0.5mum diamond polishing compound for twice, and when the sample is being observed under a telescope, so that the surface scratches in the same direction can be confirmed; finally the polished electroformed nickel sample is soaked for 5-20 seconds, wherein the erodent is prepared according to the volume ratio of nitric acid and glacial acetic acid standing at 1:1. The method uses annealing heat treatment in the preparation of electroformed nickel metallographic sample, the operation is simple and the constitution display is clear.

Description

Technical field: [0001] The invention belongs to the technical field of metallographic sample preparation, is used for preparing metallographic samples of electroformed nickel, and is a technology that is convenient to operate and can effectively display the metallographic structure of electroformed nickel. Background technique: [0002] Nickel is a soft metallic material and deformation-induced damage is a common problem in the purer components. When preparing metallographic samples, considerable surface flow and deformation will occur during the grinding and polishing process, and these deformed structures will cover up the real structure and cause false images, which will bring difficulties to the preparation of metallographic samples. After preparation, a strong protective oxide layer tends to form on the surface, which makes corrosion difficult. According to the report in the literature Zhang Sha, Zhou Yichun. Application of nano-indentation method to measure the resid...

AI Technical Summary

Problems solved by technology

During the preparation of metallographic samples, considerable surface flow and deformation will occur during the grinding and polishing process, and these deformed structures will cover up the real structure and cause false images, which will bring difficulties to the preparation of metallographic samples

After preparation, the surface tends to form a strong protective oxide layer, which makes corrosion difficult

According to the report in the literature Zhang Sha, Zhou Yichun. Application of nano-indentation method to measure the residual stress of electrodeposited nickel coating [J]. Materials Herald, 2008, 22 (2) 115-118, there is residual stress in the electrodeposited nickel coating, This will bring great difficulties to the corrosion process of the sample

The research of Li Jionghui and others (Li Jionghui, Lin Decheng. Metallographic Atlas of Metal Materials (Volume 2). Beijing: Machinery Industry Press, 2006.1929-1935) gave the metallographic atlases in the casting state, and did not mention the electroformed nickel. Metallographic diagram

However, in domestic research, there are very few reports on the preparation of electroformed nickel metallographic samples.

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