Formation and corrosion behavior of Fe-based amorphous metallic coatings by HVOF thermal spraying

Amorphous coatings with a composition of Fe 48Cr 15Mo 14C 15B 6Y 2 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 p...

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Bibliographic Details
Published in:Surface & coatings technology 2009-12, Vol.204 (5), p.563-570
Main Authors: Zhou, Z., Wang, L., Wang, F.C., Zhang, H.F., Liu, Y.B., Xu, S.H.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fe-based amorphous coating
HVOF
Materials science
Metallic coatings
Metals. Metallurgy
Microstructure
Physics
Production techniques
Surface treatment
Surface treatments
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Summary:Amorphous coatings with a composition of Fe 48Cr 15Mo 14C 15B 6Y 2 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 amorphous 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 H 2SO 4 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.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2009.08.025