Iron-based amorphous-nanocrystal composite coating and preparation method thereof

Abstract

The invention provides an iron-based amorphous-nanocrystal composite coating and a preparation method thereof. The preparation method of the iron-based amorphous-nanocrystal composite coating comprises the step that smelted alloy comprising 44-45 wt% of Fe, 8-9 wt% of Co, 10-15 wt% of Cr, 25-27 wt% of Mo, 3-5 wt% of C, 1-2 wt% of B and 1-3 wt% of Y is smeared onto a base material, so that the composite coating is obtained. According to the preparation method provided by the invention, the smelted alloy is adopted in the fusion cladding process, the process of smelting high-purity amorphous self-melting powder of conventional raw materials in a laser way is omitted, holes formed by generation of the amorphous self-melting powder are avoided accordingly, it is ensured that the composite coating of a compact structure is obtained, and the corrosion resistance of the composite coating is improved; and the amorphous forming ability of the adopted smelted alloy is high, and the amorphous content of the coating obtained through fusion cladding is high.

Description

technical field [0001] The invention belongs to the technical field of composite coatings, in particular to an iron-based amorphous-nanocrystalline composite coating and a preparation method thereof. Background technique [0002] Cladding metal coating is the main method of steel protection, but common Zn, Al and Zn-Al coatings at home and abroad are sensitive to Cl- and have low corrosion resistance, which can no longer fully meet the needs of harsh environments. High-performance amorphous coatings The research and application of the layer has aroused the close attention of the material circles in various countries. Fe-based amorphous alloy coatings have been used in ships, nuclear power, petroleum and other fields due to their high hardness, excellent wear resistance and corrosion resistance. [0003] Laser cladding (Laser Cladding) is a surface modification technology with the advantages of high energy density, low heat input, and fast cooling rate. It is a common method...

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Problems solved by technology

[0004] In recent years, researchers at home and abroad have done extensive research on iron-based amorphous coatings. Most researchers used high-purity amorphous self-fluxing alloy powders to prepare amorphous-nanocrystalline composite coatings by laser cladding technology. However, the use of amorphous powder inevitably leads to the formation of pores in the coating, which reduces the corrosion resistance of the coating, and the amorphous-nanocrystalline composite coating prepared by the existing laser cladding technology has a low amorphous content. It will also lead to poor corrosion resistance of the coating

For example, Professor Katakam of the University of North Texas used laser cladding to prepare Fe on the surface of AISI4130 steel substrate. 48 Cr 15 Mo 14 C 16 B 6 Y 2 Amorphous coating, the resulting coating has high stability, but due to the existence of more nanocrystals in the coating, the coating has a low amorphous content, resulting in poor corrosion resistance of the coating

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