Effect of Cr and Cu addition on corrosion behavior of Ni-Ti alloys.

Abstract:

:The corrosion behavior of three Ni-Ti alloys with compositions as commercial super-elastic orthodontic wires was investigated using polished plate specimens. Corrosion resistance was estimated by potentiodynamic polarization measurement in 0.9% NaCl and 1% lactic acid solutions and analysis of released metals by atomic absorption spectrophotometry. The influence of Cr and Cu addition on the structure of the surface oxide film was examined by X-ray photoelectron spectroscopy (XPS). Addition of 0.19 at% Cr had little effect on the structure of the oxide films and the corrosion resistance of the Ni-Ti alloys. For Ni-Ti-5Cu-0.3Cr alloy, the metallic Cu was enriched at the alloy/oxide film interface, resulting in increased susceptibility to pitting corrosion above +1000 mV. However, the passive current density and the amount of released Ni were not significantly increased by the addition of Cu. The study showed that small amounts of Cr and Cu added to change the super-elastic characteristics do not change the corrosion resistance of the Ni-Ti alloy freely immersed in simulated physiological environments.

journal_name

Dent Mater J

journal_title

Dental materials journal

authors

Iijima M,Endo K,Ohno H,Mizoguchi I

doi

10.4012/dmj.17.31

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

31-40

issue

1

eissn

0287-4547

issn

1881-1361

journal_volume

17

pub_type

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