Effect of copper on the localized corrosion resistance of Ni–Ti shape memory alloy

An electrochemical study aiming at the evaluation of corrosion parameters using potentiodynamic and potentiostatic techniques (“scratch” and modified ASTM F746) was conducted in 0.9% NaCl on wires from equiatomic Ni–Ti and ternary Ni 44Ti 51Cu 5 superelastic alloys with Ti 90Mo 10 as a reference mat...

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Bibliographic Details
Published in:Biomaterials 2002-02, Vol.23 (3), p.639-644
Main Authors: Rondelli, G, Vicentini, B
Format: Article
Language:English
Subjects:
Alloys
Copper - chemistry
Corrosion
Drug Stability
Elasticity
Electrochemistry - methods
Localized corrosion tests
Martensitic transformation
Nickel - chemistry
Ni–Ti–Cu alloy
Passive film
Potentiometry - methods
Stress, Mechanical
Titanium - chemistry
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Summary:An electrochemical study aiming at the evaluation of corrosion parameters using potentiodynamic and potentiostatic techniques (“scratch” and modified ASTM F746) was conducted in 0.9% NaCl on wires from equiatomic Ni–Ti and ternary Ni 44Ti 51Cu 5 superelastic alloys with Ti 90Mo 10 as a reference material. The results obtained using potentiostatic tests, that simulate better the behavior of material in service conditions than potentiodynamic ones, indicate that both Ni–Ti and Ni–Ti–Cu wires exhibit low corrosion potentials (≈50–150 mV versus SCE) inferior to that of Ti–Mo alloy. The latter proved to be immune to localized corrosion attacks up to 800 mV.
ISSN:0142-9612
1878-5905
DOI:10.1016/S0142-9612(01)00142-9