THE STUDY OF THE ELECTROCHEMICAL BEHAVIOR OF SUPERLASTIC Ti-Nb ALLOYS IN A MODEL PHYSIOLOGICAL SOLUTION UNDER THE CYCLIC LOADING


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Abstract

The replacement of bone tissue is one of the most important issues of medicine, as evidenced by the ever-increasing volumes of relevant markets. The more and more advanced requirements are imposed on the materials for  the intrabone implants. For many years, the titanium-based alloys are widely used as a material for biomedical implants due to their unique combination of properties: high strength, low hardness and density, high corrosion resistance, and bio-compatibility. One of the most common reasons for the implant’s breakage is the corrosion-fatigue failure. Thus, the corrosion and electrochemical studies in the conditions simulating the finished product mode are of great practical importance.

The aim of this paper is the comparison of the electrochemical and corrosion behavior of Ti-22Nb-6Zr superelastic alloy and the commercially used pure titanium under the simulated conditions of service of loadbearing bone implants in the solution simulating the bone tissue environment. Free corrosion potential was measured on wire samples in the 0.9 % NaCl physiological solution (B. Braun, Germany) when applying bending load (maximum induced strain is 1.5 % with  the cyclic frequency of 0.9 Hz) until the sample failure. The study shows that the Ti-22Nb-6Zr alloy is better in terms of corrosion-fatigue behavior compared to pure Ti. In particular, it possesses the higher free corrosion potential values and its passive oxide film is more resistant to the impact of cyclic loading; consequently, the alloy possesses the longer fatigue life and the number of cycles until the implant’s failure is much greater.

About the authors

A. A. Korobkova

National University of Science and Technology MISiS

Author for correspondence.
Email: nastyakorobkova@gmail.com

postgraduate student

Russian Federation

A. M. Kazakbiev

National University of Science and Technology MISiS

Email: kazakbiev@yandex.ru

postgraduate student

Russian Federation

Yu. S. Zhukova

National University of Science and Technology MISiS

Email: sdubinskiy@gmail.com

PhD (Engineering), senior researcher

Russian Federation

S. D. Prokoshkin

National University of Science and Technology MISiS

Email: prokoshkin@tmo.misis.ru

Doctor of Sciences (Physics and Mathematics), Professor, chief researcher

Russian Federation

M. R. Filonov

National University of Science and Technology MISiS

Email: filonov@misis.ru

Doctor of Sciences (Engineering), Professor, vice-rector for science and innovation

Russian Federation

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