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 <TEX>$1000^{\circ}C$</TEX> 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 <TEX>$36.5{\pm}1^{\circ}C$</TEX>. 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 (<TEX>$\alpha$</TEX>') phases of the Ti-xHf alloys increased with an increase of Hf addition. Corrosion current density <TEX>$(I_{corr})$</TEX> and current density <TEX>$(I_{300mV})$</TEX> in passive region decreased, whereas, corrosion potential increased with Hf content. At the constant potential (<TEX>$300mV_{SCE}$</TEX>), current density decreased as time increased.
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