Study of structure and corrosion resistance of Fe-based amorphous coatings prepared by HVAF and HVOF

被引：248

作者：

Guo, R. Q. ^{[1
]}

Zhang, C. ^{[1
]}

Chen, Q. ^{[1
]}

Yang, Y. ^{[1
]}

Li, N. ^{[1
]}

Liu, L. ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

来源：

CORROSION SCIENCE | 2011年 / 53卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Metal coatings; Amorphous structures; Passive films; EIS; Oxidation; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; STAINLESS-STEEL COATINGS; NACL AQUEOUS-SOLUTION; PVD COATED STEELS; BEHAVIOR; ALLOY; PERFORMANCE; PARAMETERS;

D O I：

10.1016/j.corsci.2010.12.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fe-based amorphous coatings with a composition of Fe49.7Cr18Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 have been prepared on a mild steel substrate by High velocity air fuel (HVAF) and High velocity oxygen fuel (HVOF) processes. The microstructure and corrosion resistance in 3.5 wt.% NaCl solution of the coatings prepared by the two processes were comparatively studied. It was found that the two coatings exhibit dense structure with the porosity of 0.4% and compact bonding with the substrate. However, HVOF coating contains higher oxygen content than HVAF coating, resulting from the formation of significant oxide contours between the partially melted particles in HVOF process. Electrochemical polarization tests and electrochemical impedance spectroscopy (EIS) analysis indicate that the HVAF coating has better corrosion resistance than the HVOF coating. The preferential corrosion along the oxide contours thus providing efficient diffusion channels for electrolyte accounts for the poor corrosion resistance in HVOF coating. The present results demonstrate that HVAF with less cost can be a promising spray process to fabricate the Fe-based amorphous coating for industrial applications. (C) 2011 Published by Elsevier Ltd.

引用

页码：2351 / 2356

页数：6

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