Abstract
NiCrBSiFeCoC (Ni-based) coating was prepared by high velocity oxygen fuel (HVOF) technique, and its corrosion resistance was deeply investigated by an electrochemical method using a usual hard chromium coating as a reference. Overall, the corrosion resistance of Ni-based coatings was validated to be superior to that of the hard chromium coating in the 3.5 wt% NaCl solution. When the immersion time increased from 1 to 60 days, the corrosion rate of the Ni-based coating increased, but at an almost stable corrosion multiple rate. According to the electrochemical impedance spectroscopy (EIS) data, the total impedance of the Ni-based coating was calculated to be 4.6 KΩ, 2.2 KΩ higher than that of the usual hard chromium coating after 60 days. HVOF coating could work as a better barrier against electrolyte penetration, however, the hard chromium coating was not as good as the Ni-based coating. The corresponding microstructures of the two coatings were also observed to validate their differences in corrosion resistance.
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The present work was supported by National Natural Science Foundation of China (No. 51301059).
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Li, G., Yang, X., Guo, J. et al. Study on Corrosion Resistance and Mechanism of NiCrBSiFeCoC Coating in 3.5 wt% NaCl Solution. Trans Indian Inst Met 70, 2213–2219 (2017). https://doi.org/10.1007/s12666-017-1052-7
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DOI: https://doi.org/10.1007/s12666-017-1052-7