Effect of CO2 atmosphere and spraying distance on microstructure and corrosion resistance of arc sprayed Fe-based amorphous coating

doi:10.13251/j.issn.0254-6051.2021.05.038

Abstract

Abstract: To increase the amorphous content and corrosion resistance of arc sprayed Fe-based amorphous coating, CO₂ atmosphere was used instead of air for arc spraying and the effect of spraying distance on microstructure and corrosion resistance of the coatings was studied. The results show that the thickness of the coating is about 200 μm and the coating consists of crystalline phase and amorphous phase. Compared with air, the CO₂ inhibits the crystallization, which leads to the amorphous content increase in the coating. Meanwhile, the spraying distance has a great influence on microstructure and corrosion resistance of the coating. With the increase of spraying distance, the amorphous content decreases. When the spraying distance is 100 mm, the coating has the highest open circuit potential of -0.498 V(vs SCE) and the smallest self-corrosion current density of 4.281 μA/cm², the best corrosion resistance can be obtained. The corrosion resistance of the coating is the worst when the spraying distance is 150 mm. The increase of amorphous content and the uniformity of the microstructure can enhance the corrosion resistance of the coating.

Key words: arc spraying, CO₂ protection, Fe-based amorphous coating, spraying distance, microstructure, corrosion resistance

CLC Number:

TG178

Tian Fang, Ji Xiulin, Zhao Lijuan, Zhao Jianhua. Effect of CO₂ atmosphere and spraying distance on microstructure and corrosion resistance of arc sprayed Fe-based amorphous coating[J]. Heat Treatment of Metals, 2021, 46(5): 218-223.

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Effect of CO₂ atmosphere and spraying distance on microstructure and corrosion resistance of arc sprayed Fe-based amorphous coating

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