Corrosion Behavior of Zr65Al7.5Ni10Cu17.5 Amorphous Alloy for Biomedical Use
| Autor: | Sachiko Hiromoto, Masae Sumita, An Pang Tsai, Takao Hanawa |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Amorphous metal Mechanical Engineering Alloy Metallurgy engineering.material Condensed Matter Physics Chloride Corrosion chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Mechanics of Materials medicine engineering Pitting corrosion Hydroxide General Materials Science Polarization (electrochemistry) medicine.drug Nuclear chemistry |
| Zdroj: | MATERIALS TRANSACTIONS. 42:656-659 |
| ISSN: | 1347-5320 1345-9678 |
| Popis: | To evaluate the performance of Zr 65 Al 7.5 Ni 10 Cu 17.5 amorphous alloy for the biomedical use, the effects of chloride ion, Cl-, pH, and dissolved oxygen, DO, on the anodic polarization behavior of the alloy were examined in phosphate buffered solutions. Polarization resistance, Rp, at open-circuit potential, E open , and pitting potential, E pit , were determined from the polarization curve. Compositions of passive film generated in a pH-7.5 solution with various concentrations of DO were characterized with X-ray photoelectron spectroscopy. In the solution with pH 7.5, the E pit decreased with the increase in logarithm of Cl- concentration, [Cl - ], and showed the highest value with the same DO concentration, [DO], as that in vivo. The concentrations of hydroxide group, [OH-], and phosphate ions, [H x PO (3-x)- 4 ]. in the passive film were changed with various [DO]s, and the E pit decreased with the increase in [OH - ] and [H x PO (3-x)- 4 ]. In the solution with pH 2.2, the E pit was higher than the E open with and without DO. Therefore, this alloy may be resistant to the pitting corrosion in vivo. |
| Databáze: | OpenAIRE |
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