Precision piece part watch surface chromium base alloy carbides cladding process method

Abstract

The invention discloses a treatment method of a chromium base alloy carbide coating on a precise part surface, and is applicable for the surface treatment of medium-low carbon alloy steel parts and car-poor surfaced carbon steel parts. First, the carbon addition treatment is conducted on a carbon steel part, which is just mechanically processed, and then the chromizing treatment is conducted on a carbon-rich surfaced carbon steel part. The chromizing time is short, but the efficiency is high. A chromium base alloy carbide coating on the part surface is provided with the strong adhesive force and is evenly distributed. Moreover, no unfavorable effect is caused to carbon steel texture. The surface of the treated part is provided with the high hardness, the high abrasion resistance, the high corrosion resistance, and the high high-temperature resistance.

Description

technical field [0001] The invention belongs to a method for surface treatment of metal parts, in particular to a method for treating a chromium-based alloy carbide coating on the surface of a carbon steel precision small part. Background technique [0002] In order to improve the hardness of the surface of carbon steel precision parts, increase the wear resistance, corrosion resistance and high temperature resistance of the parts, the surface high temperature chromizing process is adopted to obtain a certain thickness of chromium-based alloy carbide coating on the surface of the parts. The known treatment method of chromium-based alloy carbide coating on the surface of carbon steel parts is to mix the machined carbon steel parts and chromizing agent evenly according to a certain proportion, then put them into the reaction furnace, heat them to the reaction temperature, and keep them at high temperature for a certain period of time. , The chromizing agent interacts with the ...

AI Technical Summary

Problems solved by technology

Due to the poor flexibility of high-carbon steel parts, parts in many fields, such as the pin shafts of automobile engine chains, require good flexibility. High-carbon steel is not suitable for use, and only medium-carbon alloy steel with better flexibility can be used.

Using the known chromizing technology to treat medium and low carbon alloy steel parts, the obtained chromium-based alloy carbide coating has thin thickness and poor adhesion, which cannot achieve the desired effect

In addition, chromizing treatment consumes part of the carbon on the surface of carbon steel parts, which will affect the carbon content inside the material of the part, thereby changing the material performance of the part

At the same time, due to the influence of time, climate, environment and other factors during the storage, transportation and processing of carbon steel materials, even high carbon steel materials will appear carbon-poor on the surface, which will also affect the chromizing treatment to a certain extent Effect