Surface-nanocrystallization low-temperature aluminizing treatment method for steel products

Abstract

The invention relates to a surface-nanocrystallization low-temperature aluminizing treatment method for steel products. According to the method, uniform nanocrystallines are obtained on the surface of a material substrate by virtue of mechanical grinding, and then the steel products are subjected to low-temperature aluminizing by virtue of a rare-earth-catalyzed solid aluminizing method, so as to form a high-performance aluminized layer; the steel products and grinding balls different in particle size and quantity are put into a vibration mill together and are subjected to vibration grinding, and the impact energies of the grinding balls of different particle sizes to the surfaces of the steel products are different, so that the surface nanocrystallization treatment of the steel products is easily realized; the problems in a traditional aluminizing process that the aluminizing temperature is high, the temperature preservation time is long, the obtained aluminized layer is not compact, and the use effect is poor are solved to some degree, and a workpiece produced by virtue of the method has relatively high temperature oxidation resistance and corrosion resistance; the obtained aluminized layer is relatively uniform and compact, an aluminide coating with a single-layer structure is well combined with the substrate, a microscopic crack is avoided, the middle of the aluminized layer is a relatively narrow transition region, and Fe and Al elements are uniformly distributed.

Description

1. Technical field: [0001] The invention relates to a nanometerized low-temperature aluminizing treatment method on the surface of a steel piece, which belongs to the field of surface engineering. 2. Background technology: [0002] Aluminizing is a surface heat treatment technology. A dense film with excellent properties such as high temperature oxidation resistance and acid and alkali corrosion resistance is formed on the surface of the substrate by physical or chemical methods. Aluminized steel is widely used in some pressure parts, high temperature Oxidizing environment and some environments containing sulfur or sulfide, such as petroleum, electric power, transportation, chemical industry, metallurgy and aerospace and other fields. [0003] Aluminizing is an atomic diffusion process, which is greatly affected by temperature. In order to obtain sufficient thickness of the infiltration layer and increase the infiltration rate, a high temperature is often required. Since th...

AI Technical Summary

Problems solved by technology

In the present invention, steel parts and grinding balls of different particle sizes and quantities are put into a vibrating mill for vibration grinding. The impact energy of grinding balls with different particle sizes on the surface of steel parts is different, and it is easy to realize nano-processing on the surface of steel parts; the main purpose of the present invention It is to improve the problems of high aluminizing temperature and long holding time in the traditional aluminizing process, the obtained aluminized layer is not dense, and the use effect is poor. The workpiece obtained by this method has high high temperature oxidation resistance and corrosion resistance.

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