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Vol. 42 (2001) No. 4 P 656-659



To evaluate the performance of Zr65Al7.5Ni10Cu17.5 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, Eopen, and pitting potential, Epit, 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 Epit 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, [HxPO4(3−x)−], in the passive film were changed with various [DO]s, and the Epit decreased with the increase in [OH] and [HxPO4(3−x)−]. In the solution with pH 2.2, the Epit was higher than the Eopen with and without DO. Therefore, this alloy may be resistant to the pitting corrosion in vivo.

Copyright © 2001 The Japan Institute of Metals and Materials

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