Enhanced corrosion resistance of WC-Co with an ion beam mixed silicon carbide coating |
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Authors: | Sunmog Yeo Dong-Jin KimJae-Won Park |
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Affiliation: | Korea Atomic Energy Research Institute, 150 Dukjin-Dong, Yuseong-Gu, Daejeon, Republic of Korea |
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Abstract: | Strong adhesion of a silicon carbide (SiC) coating to a WC-Co substrate was achieved through an ion beam mixing technique and the corrosion resistance of the SiC coated WC-Co was investigated by means of a potentiodynamic electrochemical test. In a 1 M NaOH solution, the corrosion current density of SiC-coated WC-Co after heat treatment at 500 °C was about 50 times lower than that for the as-received WC-Co. In addition, the corrosion resistance systematically increases with increasing the SiC coating thickness. On the other hand, for a 0.5 M H2SO4 solution, the corrosion current density for SiC-coated WC-Co was about 3 times lower than that for the as-received WC-Co. We discuss the physical reasons for the changes in the corrosion current density with the different electrolytes. |
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Keywords: | Corrosion resistance Ion beam mixing Potentiodynamic electrochemical test |
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