研究論文
Fe固溶強化チタン焼結材の電気化学特性
キーワード:
Solid-solution strengthened sintered Titanium,
corrosion mechanism,
polarization curve,
Electrochemical Impedance Spectroscopy
2018 年 65 巻 12 号 p. 761-765
詳細
2018 年 65 巻 12 号 p. 761-765
Titanium and its alloy have passive state film, which were formed on the surface by action of moisture and oxygen in the air. Titanium shows superior corrosion resistance due to the protection of passive state film. Recently, Fe solid-solution strengthened sintered titanium alloys made by powder metallurgy process is developed to achieve high strength, high ductility and low cost. However, evaluation of corrosion resistant property has not been carried out. For the purpose of evaluating the corrosion resistance of the material quantitatively, we employed electrochemical methods. Seven kinds of iron solid-solution strengthened sintered titanium with different Fe contents (0, 0.2, 0.6, 1, 2, 3, and 4 weight%) and three kinds of melted titanium alloys with different Fe contents (0, 0.2, and1 weight%) were prepared.
Potentio-dynamic polarization curve measurement was carried out for these materials. According to the results of polarization curve, corrosion rate of iron solid-solution strengthened sintered titanium increased with iron level. However, it shows approximately equivalent corrosion resistant to melted titanium alloys.
