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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    Special 3    December 2009

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Formation and corrosion behavior of Fe-based amorphous metallic coatings prepared by detonation gun spraying
XU Li-juan(徐丽娟)1, XIAO Shu-long(肖树龙)1, TIAN Jing(田 竟)1,
CHEN Yu-yong(陈玉勇)1, HUANG Yu-dong(黄玉东)2

1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

Abstract:Amorphous metallic coatings with a composition of Fe48Cr15Mo14C15B6Y2 were prepared by detonation gun spraying process. Microstructural studies show that the coatings present a densely layered structure typical of thermally sprayed deposits with the porosity below 2%. Both crystallization and oxidation occurred obviously during spraying process, so that the amorphous fraction of the coatings decreased to 54% compared with fully amorphous alloy ribbons of the same component. Corrosion behavior of the amorphous coatings was investigated by electrochemical measurement. The results show that the coatings exhibit extremely wide passive region and low passive current density in 3.5% NaCl (mass fraction) and 1 mol/L HCl solutions, which illustrates excellent ability to resist localized corrosion.

 

Key words: Fe-based amorphous coating; detonation gun; microstructure; corrosion behavior

ISSN 1672-7029
CN 43-1423/U

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