타이타늄 합금에서 산소발생전위 지연이 부동태 피막 특성과 국부부식 저항성에 미치는 영향
Effect of Delayed Oxygen Evolution in Anodic Polarization on the Passive Film Characteristic and Localized Corrosion Resistance of Titanium Alloys
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The objective of this study was to investigate delayed oxygen evolution and localized corrosion resistanceof titanium alloys by performing potentiodynamic polarization, potentiostatic polarization, and Mott-Schottkymeasurements. Delayed oxygen evolution was compared among titanium alloys, 316 stainless steel, and platinum. Difference in delayed oxygen evolution between titanium alloys and other metals was attributed to specificsurface characteristic of each metal. Delayed oxygen evolution of titanium alloys resulted from the predominantprocess of ionic conduction over electronic conduction. The effect of oxygen evolution on localized corrosionof titanium alloys was investigated using electrochemical critical localized corrosion temperature (E-CLCT)technique. Mott-Schottky measurement was performed to clarify the difference in film properties betweentitanium alloys and stainless steels. Titanium alloys were found to have much lower donor density thanstainless steels by 1/28. These results indicate that delayed oxygen evolution has little influence on theconcreteness of passive film and the resistance to localized corrosion of titanium alloys.
Abstract
The objective of this study was to investigate delayed oxygen evolution and localized corrosion resistanceof titanium alloys by performing potentiodynamic polarization, potentiostatic polarization, and Mott-Schottkymeasurements. Delayed oxygen evolution was compared among titanium alloys, 316 stainless steel, and platinum. Difference in delayed oxygen evolution between titanium alloys and other metals was attributed to specificsurface characteristic of each metal. Delayed oxygen evolution of titanium alloys resulted from the predominantprocess of ionic conduction over electronic conduction. The effect of oxygen evolution on localized corrosionof titanium alloys was investigated using electrochemical critical localized corrosion temperature (E-CLCT)technique. Mott-Schottky measurement was performed to clarify the difference in film properties betweentitanium alloys and stainless steels. Titanium alloys were found to have much lower donor density thanstainless steels by 1/28. These results indicate that delayed oxygen evolution has little influence on theconcreteness of passive film and the resistance to localized corrosion of titanium alloys.
참고문헌 (16)
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