HIP処理したTi-4Fe合金の不動態被膜中における組成分析

概要

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The relation between cationic mass fraction and the sputtering time in the passive film of Ti-4Fe specimen was investigated by ESCA compared with Ti-6Al-4V and Ti-5Al-2.5Fe specimens, where the specimens were held at 1.2 VSHE or 2.4 VSHE for 10 ks in the physiological saline solution. When the specimens were held at 1.2 VSHE, it was observed that Al increased remarkably in the passive film of Ti-6Al-4V and Ti-5Al-2.5Fe specimens, while V and Fe decreased compared with their initial contents. The Fe content in the passive film of Ti-4Fe specimen, however, was confirmed to be nearly the same as the initial value. The localized attack was observed on the surfaces of Ti-6Al-4V and Ti-5Al-2.5Fe specimens during kept at 2.4 VSHE, where the α phase has been preferentially attacked and Al content decreased in the localized attack region. However, the Ti-4Fe specimen was not attacked even in this case and showed the good corrosion resistance.