Journal
CORROSION SCIENCE
Volume 53, Issue 7, Pages 2351-2356Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.12.022
Keywords
Metal coatings; Amorphous structures; Passive films; EIS; Oxidation
Funding
- National Fundamental Research Program of China [2007CB613908]
- National Natural Science Foundation of China [50871042]
- National Magnetic Confinement Fusion Program, China [2010GB109000]
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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.
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