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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.42  No.4 (2001)  >  pp.656-659

MATERIALS TRANSACTIONS
<<Previous article Vol.42  No.4 (2001)   pp.656 - 659 Next article>>

Corrosion Behavior of Zr65Al7.5Ni10Cu17.5 Amorphous Alloy for Biomedical Use

Sachiko Hiromoto1), An Pang Tsai1), Masae Sumita1) and Takao Hanawa1)
1) National Research Institute for Metals

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.


Keyword:
biomaterials, Zr65Al7.5Ni10Cu17.5 amorphous alloy, electrochemical measurement, chloride ion, pH, dissolved oxygen

Received: November 27, 2000
Accepted: January 31, 2001 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals

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