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1 2008

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Study on bioactivity of NiTinol after surface treatment

Chrzanowski A., Walke W., Armitage D., Knowles J.

Archives of Materials Science and Engineering

2008

Vol. 31, nr 1

5-8

Purpose: The aim of the work was to assess bioactive properties and corrosion resistance of nickel titanium alloy after alkali treatment and spark oxidation in Hank’s Balance Salt Solution. Design/methodology/approach: Surfaces of samples were prepared by chemical treatment in NaOH followed by heat treatment, and spark oxidation. Corrosion resistance was investigated using potentiodynamic method. Chemical composition of the samples surface was measured using SEM EDX. Surface roughness and topography was analyzed using AFM. Bioactive properties were analyses on the basis of the chemical composition of the samples immersed in HBSS for 14 days. Findings: The chemical composition analysis of the samples showed that alkali treatment increased significantly nickel content in top layer and also increase in roughness was observed. Spark oxidation results also in roughness increase. Corrosion test showed insignificant increase of the corrosion resistance after oxidation while alkali treatment caused drop of the resistance. Bioactivity study revealed that both applied treatments did not improve bioactive properties of the NiTinol when compared with simply ground samples. Research limitations/implications: Two types of the treatment applied for nickel titanium and intended to improve bioactive properties were investigated. There was no improvement in bioactivity observed after surface treatment. However, alternation in chemical composition, corrosion resistance, and topography were observed. Further analysis of biocompatibility and mechanical properties are required. Practical implications: Both chemical and electrochemical treatment, as presented in the paper, gave promising results in terms of wetting ability, topography and apatite film formation, however further study are required to confirm suitability of the treatments for medical applications. Originality/value: The obtained results revealed unsuitability of the alkali treatment intended to improve bioactivity of the Nitinol. Nevertheless, obtained results for spark oxidised samples were found promising in terms of the chemistry and topography and further biological studies are planned.