Abstract
The corrosion behavior of a nickel titanium alloy (NiTi) have been investigated. The NiTi alloy is subjected to cyclic thermal loading in corrosive environments (3.5 wt% NaCl and Ringer solution). Thermogravimetric measurement versus temperature is perfumed to obtain forward and reverse martensitic transformation temperatures. Electrochemical Avesta cell is used to study corrosion behavior of NiTi alloy under thermal cycling in absence of mechanical loading. Electrochemical Impedance Spectroscopy and cyclic voltammetry measurements are used to study corrosion behavior at different temperatures and phases. The change in corrosion rate during phase transformations are being investigated. An equivalent circuit model is used to calculate the electrochemical parameters from EIS measurements for forward and reverse martensitic transformations. The results shows the breakdown of passive oxide film on the surface with martensitic transformation. This breakdown would be an origin for fatigue crack initiation and an explanation for fatigue lifetime reduction of NiTi in corrosive environments.
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