Polishing agent for precise polishing of high-alloy-aluminium metallographic sample, and precise polishing method

Abstract

The invention discloses a polishing agent for precise polishing of a high-alloy-aluminium metallographic sample. The polishing agent comprises water, corundum particles and sodium hydroxide, namely, sodium hydroxide, which is an chemical aggressive agent, is added in corundum polishing suspension formed by water and corundum powder, so that not only can the problems of disturbance layers and scratches of mechanical polishing be avoid, but also the problem of disappearance or protrusion of part of phase corrosion of electrolysis and chemical polishing can be avoid, further, the circumstance of observation illusion can be avoided; and meanwhile, the time for precise polishing can be shortened greatly, so that the purpose of preparing high-quality metallographic samples quickly can be achieved. When the agent for precise polishing of a high-alloy-aluminium metallographic sample, provided by the invention, is in use, a polisher is started first, then a reagent bottle filled with the polishing agent is shaken until the polisher runs normally so as to ensure that the polishing agent is mixed uniformly, and the reagent bottle is compressed to enable the polishing agent to be uniformly sprayed onto polishing fabric of the polisher. The invention further discloses a precise polishing method for a high-alloy-aluminium metallographic sample.

Description

technical field [0001] The invention relates to the technical field of fine polishing, in particular to a polishing agent for fine polishing of high-alloy aluminum metallographic samples. The invention also relates to a fine polishing method for a high-alloy aluminum metallographic sample. Background technique [0002] The preparation of metallographic samples is the basic work of material research. Aluminum alloys are more difficult to prepare high-quality metallographic samples due to their low hardness. [0003] Traditional methods only use one of mechanical polishing, electrolytic polishing or chemical polishing to prepare metallographic samples. Mechanical polishing alone uses the mechanical cutting effect of abrasives and polishing agents used in conjunction with abrasives to cut the surface of the sample and finally achieve the effect of an optical mirror. This method takes a long time and it is difficult to completely eliminate mechanical scratches on the surface of...

AI Technical Summary

Problems solved by technology

Mechanical polishing alone uses the mechanical cutting effect of abrasives and polishing agents used in conjunction with abrasives to cut the surface of the sample and finally achieve the effect of an optical mirror. This method takes a long time and it is difficult to completely eliminate mechanical scratches on the surface of the sample. Disturbance layers can easily cause observation artifacts

[0004] Electrolytic polishing or chemical polishing alone is to use the effect of preferential dissolution of the tip in the process of electrolysis or chemical corrosion, so that the convex part of the sample surface is rapidly dissolved, and the concave part is slowly dissolved, finally achieving the effect of an optical mirror. The electrode potentials of the phases are very different, resulting in a large difference in the electrochemical or chemical dissolution rate of each phase, which can easily cause some phases to dissolve or bulge, resulting in false observations

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