Protective coating for surface of steel workpiece

Abstract

The invention relates to a protective coating for the surface of a steel workpiece, which comprises the following components: graphite, sodium silicate and a surface penetrant, wherein the volume ratio of the graphite to the sodium silicate is 1: 3-7; and the surface penetrant accounts for 0.05 to 0.15 percent of the total volume in the components. The coating has the advantages that the coating not only avoids disadvantages caused by usual methods such as adding alloy, performing surface high-frequency quenching, forming carburizing atmosphere and the like, prevents the surface of the steel workpiece from high-temperature oxidation decarbonization, but also improves the hardness of the surface of the steel workpiece (matrix) to realize the improvement of the wear resistance thereof, and solves the existing problems of high production cost, low production efficiency, long production period, large energy consumption and environmental pollution.

Description

technical field [0001] The invention relates to a protective coating for the surface of steel workpieces, in particular to a protective coating for preventing high-temperature oxidation and decarburization of the surface of steel workpieces, improving hardness and wear resistance, and belongs to the field of coatings. Background technique [0002] At present, both at home and abroad, the purpose of improving the hardness of the surface (matrix) of steel workpieces is to achieve the wear resistance, and finally to improve the life of the workpieces. The basic route is to add alloying elements to the workpiece, cast infiltration technology, surface high-frequency quenching, or form a carburizing atmosphere during heat treatment, hot forging, hot rolling, and coil forming heating to increase the carbon potential concentration, etc., but there are High production cost, low production efficiency, long production cycle, complex technology, equipment investment, large energy consum...

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Problems solved by technology

[0003] The purpose of the present invention is aimed at high-temperature oxidative decarburization of the surface (matrix) of iron and steel workpieces, and surface oxidation and decarburization in an oxidative atmosphere during heat treatment, forging, hot rolling, and coil forming heating, especially in the high-temperature environment of heat treatment It is extremely easy to oxidize and decarburize, the carbon atoms are reduced, the carbon content is reduced, the hardness is reduced due to the change of the surface (matrix) structure, the wear resistance is reduced and the overall life is short, providing a way to prevent its surface from high temperature oxidation , decarburization, improve hardness and wear resistance, and finally achieve a protective coating for the surface of steel workpieces that improves the overall life of steel workpieces

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