염소이온 함유된 용액에서 Ti합금의 부식특성에 미치는 Hafnium함량의 영향
Effects of Hafnium Addition on the Pitting Corrosion Behavior of Ti Alloys in Electrolyte Containing Chloride Ion
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The aim of this study was to investigate effects of hafnium content on the corrosion behavior of Ti alloys in electrolyte containing chloride ion. For this study, Ti-Hf binary alloys contained 10 wt%, 20 wt% and 30 wt%Hf were manufactured in a vacuum arc-melting furnace and subjected to heat treatment for 12h at 1000°C in an argon atmosphere. The pitting corrosion behavior of the specimens was examined through potentiodynamic and potentiostatic tests in 0.9 wt% NaCl electrolyte at 36.5 ± 1°C. The corrosion morphology of Ti-xHf alloys was investigated using optical microscopy (OM) and X-ray diffractometer (XRD). From the optical microstructures and XRD results, needle-like martensite (α') phases of the Ti-xHf alloys increased with an increase of Hf addition. Corrosion current density (Icorr) and current density (I300mV) in passive region decreased, whereas, corrosion potential increased with Hf content. At the constant potential (300 mVSCE), current density decreased as time increased.
Abstract
The aim of this study was to investigate effects of hafnium content on the corrosion behavior of Ti alloys in electrolyte containing chloride ion. For this study, Ti-Hf binary alloys contained 10 wt%, 20 wt% and 30 wt%Hf were manufactured in a vacuum arc-melting furnace and subjected to heat treatment for 12h at 1000°C in an argon atmosphere. The pitting corrosion behavior of the specimens was examined through potentiodynamic and potentiostatic tests in 0.9 wt% NaCl electrolyte at 36.5 ± 1°C. The corrosion morphology of Ti-xHf alloys was investigated using optical microscopy (OM) and X-ray diffractometer (XRD). From the optical microstructures and XRD results, needle-like martensite (α') phases of the Ti-xHf alloys increased with an increase of Hf addition. Corrosion current density (Icorr) and current density (I300mV) in passive region decreased, whereas, corrosion potential increased with Hf content. At the constant potential (300 mVSCE), current density decreased as time increased.
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