Abstract
Fe48Cr15Mo14C15Y2B6 amorphous coating was prepared on a mild steel substrate by high velocity oxygen fuel (HVOF) process. The as-sprayed coating was annealed at various temperatures to form a composite structure with different portions of crystalline phase. The effect of crystallization on the corrosion resistance of the coatings was then systematically studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) analysis in 0.6M NaCl solution. The results revealed that the corrosion resistance of the coating deteriorated with the increase in the amount of crystalline phase. The detailed investigation by SEM/EDX indicated that pits always initiated at the boundaries around the carbide precipitates, where exhibited a low content of (Cr, Mo)-oxides in the passive film. Finally, a chromate treatment by using the K2Cr2O7 passivant was performed on the crystallized coating, which leads to the recovery of the corrosion resistance of the coating.
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