Corrosion resistance of NiTi alloy

A new study focues on the corrosion resistance of a superelastic NiTi alloy coated with graphene–based coatings.

Drops on an alumium surface as a symbolic image.
According to the researchers Image source:  avi_acl - Pixabay (symbol image).

During the study, the mechanical responses under superelastic loading cycles and the corrosion protection capacity of two graphene–based coatings applied to a NiTi alloy were evaluated. Graphene oxide (GO) and a composite of reduced graphene oxide (rGO) incorporated in a block copolymer of styrene–ethylene–butylene–styrene (SEBS) were deposited on the substrate via dip–coating.

Corrosion resistance

The corrosion behavior was studied by potentiodynamic polarisation (PP), electrochemical impedance spectroscopy (EIS), and Mott–Schottky analysis (MSA). However, PP and EIS showed that only the rGO + SEBS coating results in a significant improvement in terms of corrosion resistance. Furthermore, rGO + SEBS decreased the oxygen vacancies in the passive film when compared with the bare NiTi and GO coating.

The study has been published in Progress in Organic Coatings, Volume 165, April 2022.

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