Corrosion Characteristics of α-Ti and Ti_2Cu Composing Ti-Cu Alloys

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A series of binary Ti-Cu alloys containing 5-20 mass% Cu was prepared, and the corrosion behavior of α-Ti and Ti_2Cu composing the Ti-Cu alloys were examined based on the anodic polarization curves and released ions in 0.9% NaCl and 1% lactic acid solutions. In both solutions, the Ti-Cu alloys showed the same anodic polarization curves as titanium in the condition below 1.4V. However, precipitation of Ti_2Cu contributed to a small increase in current densitiy in the transpassive region beyond 1.4V. The amount of Cu ions released from Ti_2Cu was 0.260 and 1.003 (μg/cm^2/7 days) in 0.9% NaCl and 1% lactic acid solutions respectively. Although these values were larger than those from α-Ti (0.0379±0.0041 and 0.0962±0.0327 (μg/cm^2/7days) in NaCl and lactic acid solutions respectively), they were not greater than those from type 4 gold alloy under the same conditions.
日本歯科理工学会の論文