Abstract
In the context of the ongoing research addressing problems of random clinical failures of braided esophageal NiTi stents, we introduce novel in-situ electrochemical methods for investigation of corrosion fatigue of superelastic NiTi wires or springs subjected to cyclic mechanical loadings in simulated body fluids. Corrosion fatigue properties of NiTi are very different from conventional materials due to the intrinsic recoverable deformability of the surface originating from martensitic transformation. It is shown that the localized corrosion of phase transforming NiTi is strongly facilitated by cracking of the surface oxide, crack opening/closing and passivation, mutually competing during cyclic mechanical loading in fluids.
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