NaCl 용액에서 Nb 첨가가 Ti 합금의 부식 거동에 미치는 영향
Effects of Niobium Addition on the Corrosion Behavior of Ti Alloys in NaCl Solution
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In this study, the effect of niobium addition on the passivation behavior of Ti alloys in NaCl solution was investigated using various electrochemical methods. An α-phase in Ti alloy was transformed into a β-phase and martensite structure decreased as Nb content increased. The corrosion and passivation current density(+300 mVSCE) decreased as Nb content increased, and thereby a stable passive film was formed on the Ti alloy. Potential of Ti-xNb alloy in the passive region increased, whereas, current density decreased with time from results of potentiostatic and galvanostatic tests. Also, the corrosion morphology showed the smaller pits as Nb content increased. Consequently, Ti alloy contained high Nb content showed a good resistance to pitting corrosion in 0.9% NaCl solution.
Abstract
In this study, the effect of niobium addition on the passivation behavior of Ti alloys in NaCl solution was investigated using various electrochemical methods. An α-phase in Ti alloy was transformed into a β-phase and martensite structure decreased as Nb content increased. The corrosion and passivation current density(+300 mVSCE) decreased as Nb content increased, and thereby a stable passive film was formed on the Ti alloy. Potential of Ti-xNb alloy in the passive region increased, whereas, current density decreased with time from results of potentiostatic and galvanostatic tests. Also, the corrosion morphology showed the smaller pits as Nb content increased. Consequently, Ti alloy contained high Nb content showed a good resistance to pitting corrosion in 0.9% NaCl solution.
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