A kind of anti-carburization coating specially used for finishing parts and preparation method thereof

Abstract

The invention discloses anti-carburizing paint special for finish machining parts. The anti-carburizing paint is formed by mixing and grinding the components which include, by mass, 15%-30% of an anti-carburizing agent, 10%-20% of titanium dioxide, 20%-30% of aluminum dihydrogen phosphate, 3%-5% of ethyl alcohol, 3%-5% of tetrasodium ethylenediamine tetraacetate, 3%-5% of sodium carboxymethylcellulose, 1%-5% of triethanolamine, 0.5%-1% of a polyether modified silicone defoamer, 0.5%-3% of nonylphenol polyoxyethylene ether, 0.5%-1% of ferrous sulfate and the balance deionized water. The anti-carburizing agent refers to a mixture of boric anhydride powder and cuprous oxide powder with the mass ratio being 3-8:1. According to the anti-carburizing paint disclosed by the invention, the particle diameters are small, and thus good wettability and mobility are achieved; the anti-carburizing paint can be attached to the small parts like threads and inner holes more easily to form a closed protective layer, and the protective layer can be evenly covered on the portion to be anti-carburized and is low in porosity, good in closure and excellent in anti-carburizing effect; and moreover, the anti-carburizing paint can be removed by means of washing after heat treatment.

Description

technical field [0001] The invention relates to an anti-carburization coating, in particular to an anti-carburization coating specially used for finishing parts, and also relates to a preparation method of the above-mentioned anti-carburization coating specially used for finishing parts. Background technique [0002] After the motorcycle main shaft, automobile bevel gear, automobile steering screw and other parts are machined, in the heat treatment process, it is necessary to carry out anti-carburization treatment on parts, especially on threads, inner holes, grooves, splines and other parts, so as to maintain Its low surface hardness facilitates subsequent processing. Anti-carburization methods mainly include organic processing, copper plating and coating methods: the machining method is to increase the machining allowance of the workpiece, and remove the carburized layer by turning after heat treatment. This method brings material waste and There are problems such as incr...

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Problems solved by technology

But the water-based resin in the coating described in CN101074455A can decompose in the carburizing process, and releases carbon-containing organic gas, which easily disturbs the atmosphere in the furnace and affects the carburizing quality

At the same time, the coatings in the above two patents also have large particles (D90 ≥ 50 μm), resulting in poor wetting performance of the coating on parts such as threads, inner holes, and grooves, poor fluidity of the coating, rough and uneven coating, and pores. A series of problems such as large and large, and eventually lead to the carburizing atmosphere is easy to contact with the anti-seepage surface to form local leakage, it is difficult to specialize in the anti-carburization treatment of threads or inner holes

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