Formation and corrosion behavior of Fe-based amorphous metallic coatings prepared by detonation gun spraying

来源期刊：中国有色金属学报(英文版)2009年增刊第3期

论文作者：周正 王鲁 王富耻 柳彦博

文章页码：634 - 638

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

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.