액체급냉법에 의한 비정질 M-Nb-B (M=Co, Fe) 합금의 전기화학적 부식특성

Abstract

ABSTRACT

Electrochemical Corrosion Properties of Amorphous M-Nb-B (M=Co, Fe) Alloys Prepared by Melt-Spinning Method

Eun-Sun Kim Advisor : Prof. Hyun-Goo Kim, Ph. D. Department of Physics Education, Graduate School of Chosun University

This study was undertaken to examine the electrochemical corrosion properties of M-Nb-B (M = Co, Fe) amorphous alloys prepared by melt-spinning method under various conditions. The potentiodynamic polarization responses at various levels of pH (pH 12, pH 7, pH 2) showed that the uniform corrosion resistance of Fe80Nb10B10 alloy is better than that of Fe82Nb8B10 alloy at all levels of pH. Likewise the corrosion resistance of Co80Nb10B10 alloy was better than that of Co82Nb8B10 in the same corrosion environment. The corrosion rate of an alloy was usually reduced by increasing solution pH. Fe82Nb8B10 alloy was passivated neither in 0.01 M nor 0.1 M NaCl solution. Pitting occurred on Fe80Nb10B10 and the pitting potential was lower at higher NaCl concentration. The pitting resistance of Co80Nb10B10 alloy was better than that of Co82Nb8B10, evidenced by the higher pitting potential.