Effects of Mo and Pd on Corrosion Resistance of V-Free Titanium Alloys for Medical Implants
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- Okazaki Yoshimitsu
- Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, Ministry of International Trade and Industry
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- Kyo Kenji
- Nippon Institute of Technology
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- Ito Yoshimasa
- Technical Development Group, Kobe Steel, LTD
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- Tateishi Tetsuya
- National Institute for Advanced Interdisciplinary Research
書誌事項
- タイトル別名
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- Effects of Mo and Pd on Corrosion Resis
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The corrosion resistances of Ti-15%Zr-4%Nb-4%Ta-0.2%Pd-0.2%O-0.05%N and Ti-15%Sn-4%Nb-2%Ta-0.2%Pd-0.2%O alloys were compared with pure Ti grade 2, Ti-6%Al-4%V ELI (Extra low interstitial), Ti-6%Al-2%Nb-1%Ta and β type Ti-15% Mo-5%Zr-3%Al alloys for medical implants by anodic polarization and immersion tests at 310 K in various pseudo saline solutions.<BR>The change in current density was small up to passivity zones in 1 mass% lactic acid, PBS (Phosphate-buffered saline solution) (−), calf serum and Eagle’s MEM (Minimum essential medium) + bovine serum solutions except 5% HCl. The current density change of Ti-15%Zr-4% Nb-4%Ta-0.2%Pd-0.2%O-0.05%N alloy was lowest among the whole Ti alloys. The current densities in a region higher than 2 V tend to increase in the following relation; Ti-6%Al-4%V ELI>Pure Ti grade 2>Ti-6%Al-2%Nb-1%Ta>Ti-15%Sn-4%Nb-2%Ta-0.2%Pd-0.2%O>Ti-15%Zr-4%Nb-4%Ta-0.2%Pd-0.2%O-0.05%N alloy in α+β type alloys. Otherwise the passive current density of the β type Ti-15%Mo-5%Zr-3%Al alloy was higher than that of α+β type alloys. Passive films formed on the Ti-15%Mo-5%Zr-3%Al alloy in the calf serum consisted mainly of Ti4+, Zr4+, Al6+ and Mo as demonstrated by X-ray photoelectron spectroscopy (XPS).<BR>The rate of Ti ions released from Ti alloys in a deaerated 5% HCl solution decreased with increasing Zr, Nb, Ta, and Pd contents. Especially, the rate of Ti ions released from Ti-15%Zr-4%Nb-(2∼4%)Ta–Pd alloys containing Pd in the range from 0 to 0.2% decreased remarkably compared to 0.2 to 0.5%Pd. The passive films formed on the Ti–Zr–Nb–Ta–Pd and Ti–Sn–Nb–Ta–Pd alloys containing 0.2% Pd in the immersion test consisted mainly of Ti4+, Zr4+, Sn4+, Sn, Nb5+, Ta5+ and Pd. The rate of released Ti increased by the following relation; Ti-15%Sn-4%Nb-2%Ta-0.2%Pd-0.2%O≥Ti-6%Al-2%Nb-1%Ta≥Ti-6%Al-4%V ELI≥Pure Ti grade 2>Ti-15%Zr-4%Nb-4%Ta-0.2%Pd-0.2%O-0.05%N≥β type Ti-15%Mo-5%Zr-3%Al alloy.
収録刊行物
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- Materials Transactions, JIM
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Materials Transactions, JIM 38 (4), 344-352, 1997
社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679223913984
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- NII論文ID
- 130003556913
- 10002452378
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- NII書誌ID
- AA10699969
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- COI
- 1:CAS:528:DyaK2sXjvVamtrs%3D
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- ISSN
- 2432471X
- 09161821
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- NDL書誌ID
- 4209554
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可