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http://dx.doi.org/10.14773/cst.2014.13.4.152

Electrochemical Corrosion Properties of Amorphous Co-Nb-B Alloys Prepared by Melt-Spinning Method  

Kim, Eun-Sun (Department of Physics Education, Chosun University)
Kim, Hyun-Goo (Department of Physics Education, Chosun University)
Jang, HeeJin (Department of Metallurgical and Materials Engineering, Chosun University)
Publication Information
Corrosion Science and Technology / v.13, no.4, 2014 , pp. 152-156 More about this Journal
Abstract
This study was undertaken to examine the electrochemical corrosion properties of an $Co_{80}Nb_{10}B_{10}$ and $Co_{82}Nb_8B_{10}$ amorphous alloys prepared by melt-spinning method under various conditions. The potentiodynamic polarization responses at various levels of pH (pH 2, pH 7, pH 12) showed that the corrosion current rate of $Co_{80}Nb_{10}B_{10}$ alloy is lower than that of $Co_{82}Nb_8B_{10}$ alloy in all levels of pH, implying the general corrosion resistance of the alloy with higher Nb content is better than that with higher Co content. The pitting potential of $Co_{80}Nb_{10}B_{10}$ alloy was also better than that of $Co_{82}Nb_8B_{10}$, evidenced by the higher pitting potential. Nb is thought to be effective in increasing the protectiveness of the passive film and hence to improve the corrosion resistance of Co-Nb-B alloys.
Keywords
amorphous alloys; Co-Nb-B alloys; potentiodynamic polarization; uniform corrosion; pitting;
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