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Corrosion behavior of Ni+ -Ion Irradiated NiTi Alloys

Published online by Cambridge University Press:  25 February 2011

R. Wang  and
J. L. Brimhall
R. Wang
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352.
J. L. Brimhall
Affiliation:
Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352.
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Abstract

Corrosion behavior of Ni+ -irradiated NiTi alloys was studied in chloride solutions, together with unirradiated NiTi material with different surface conditions. Ion irradiation with either 2.5 or 5 MeV Ni+ ions transformed the NiTi surface into an amorphous layer up to 1.5 micrometers thick. Studies of corrosion potential vs. time and polarization behavior indicated a small enhancement of the passivation for the Ni+-irradiated NiTi over the unirradiated NiTi. The unirradiated NiTi with a mechanically polished, coarse surface was susceptible to pitting and crevice corrosion attack in 1 N HCl solution. The homogeneous amorphous structure in the irradiated alloy retarded this type of localized corrosion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 27: Symposium E – Ion Implantation and Ion Beam Processing of Materials , 1983 , 729
Copyright
Copyright © Materials Research Society 1984

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References

REFERENCES

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