Effects of Anodic Oxidation in Ethylene Glycol Based Electrolyte on the Corrosion Resistance and Biocompatibility of NiTi Shape Memory Alloy

Abstract:

Nickel titanium (NiTi) is the most attractive shape memory alloy in industrial and in medical application but suffer from corrosion attack by body fluids. Nowadays, Electrochemical anodization has become a popular surface modification method for biomaterials. In this study we prepared TiO₂ coating with nanoporous surface morphology on NiTi shape memory alloy by using electrochemical anodization in ethylene glycol based electrolyte followed by annealing in 600 °C and explored its appropriateness for biomedical applications. Morphology and crystal structure of the film was characterized by Field emission scanning electron microscopiy (FE-SEM) and X-ray diffraction (XRD) tests. The corrosion resistance of the treated NiTi alloy was investigated by potentiodynamic polarization test and The findings showed that the anodization in ethylene glycol solution extremely increased the corrosion resistance and hence biocompatibility.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 431-435
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.431
• Online since: November 2013
• Authors: Maryam Pourmahdavi*, Nader Parvin
• Keywords: Anodization, Corrosion Resistance, Nanoporous Structure, Nickel Titanium Shape Memory Alloy

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