高成形性形状記憶合金の耐食性のコンビナトリアル評価

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  • Combinatorial Evaluation for corrosion resistance of High Formable Shape Memory Alloys

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<p>In this study, we propose a combinatorial evaluation method for evaluating the corrosion resistance of the Ti-Ni-based high formable shape memory alloys (HFSMAs) based on anodic polarization tests. The proposed evaluation substrates compose nine samples which have different compositions. These samples are deposited on a glass substrate by carousel sputtering system and microelectromechanical processes. Further, we performed anodic polarization tests on the Ti–Ni–Zr and Ti–Ni–Cu HFSMAs samples. The polarization curves are obtained by sweeping the potential and the current density at the passive state (ips) of each composition tested is compared. In case of the Ti–Ni–Zr alloy, ips varied depending on the Zr content. When the Zr content ranged from 10 to 15 at.%, their ips were comparable with that of Ti48Ni52 used in medical devices. On the other hand, in case of the Ti-Ni-Cu alloy, their ips were similar to that of Ti48Ni52 regardless of Cu content. We obtained Ti–Ni–Zr and Ti–Ni–Cu HFSMAs having a corrosion resistance equivalent to that of Ti48Ni52. Furthermore, we conducted XPS analysis to investigate the passive film of HFSMAs. The thin surface film of Ti-Ni-Zr alloys were composed of TiO2 and ZrO2, while that of Ti-Ni-Cu alloys were composed of only TiO2. We have concluded that the formation of TiO2 enriched protective thin surface film might have been responsible for the high corrosion resistance.</p>

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