Journal
SURFACE & COATINGS TECHNOLOGY
Volume 204, Issue 5, Pages 563-570Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2009.08.025
Keywords
Fe-based amorphous coating; HVOF; Microstructure; Corrosion resistance
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coatings with a composition of Fe48Cr15Mo14C15B6Y2 were prepared by means of high velocity oxygen fuel (HVOF) thermal spraying under different conditions. Microstructural studies show that the coatings present dense layered structure and low porosity with a fraction of nanocrystals precipitated. The porosity and fraction of the coatings decrease as the kerosene and oxygen flow increase within the parameter range examined. Corrosion behavior of the amorphous coatings was investigated by electrochemical measurement. The results show that the coatings are spontaneously passivated with wide passive region and low passive current density in 3.5% NaCl. 1 N HCl and 1 N H2SO4 solutions. and exhibit an excellent ability to resist localized corrosion. However, the corrosion resistance of the coatings decreases in 1 N NaOH solution with lower transpassive potential and passive region. In addition, the optimal spraying parameter improves the corrosion resistance of the amorphous coatings obviously due to the proper proportion of porosity and amorphous fraction. (C) 2009 Elsevier B.V. All rights reserved.
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