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Corrosion resistance of NiTi alloy in simulated body fluids

Kaczmarek M.

Archives of Materials Science and Engineering

2007

Vol. 28, nr 5

269-272

Purpose: Corrosion resistance of an implant alloy is a very important determinant of its biocompatibility. The nature of an environment and surface treatments have a significant influence on corrosion. Most of the knowledge on the corrosion behavior of NiTi is from studies of "standard" corrosion tests. In fact, the knowledge of the corrosion behavior of NiTi inside the body is very limited. The main aim of the research was evaluation of corrosion resistance of NiTi alloy in various simulated body fluids. Design/methodology/approach: The evaluation of the electrochemical behavior of NiTi alloy was realized by recording of anodic polarization curves with the use of the potentiodynamic method. The tests were carried out for differently modified surfaces in diverse simulated body fluids. Findings: Surface condition of a metallic biomaterial determines its corrosion resistance. In the course of the work the good corrosion resistance of all the tested samples (with different surface conditions) was observed. Research limitations/implications: The obtained results are the basis for the optimization of physicochemical properties of the NiTi alloy. The future research should be focused on selected specific implants specially with respect to their application features. Practical implications: On the basis of the obtained results it can be stated that the suggested surface treatment can be applicable for NiTi alloys due to the increase of the corrosion resistance. Originality/value: The paper presents the influence of various methods of the surface treatment on corrosion resistance of the NiTi alloy. The suggested surface treatment methods can be applied to implants intended for diverse medical applications, especially in cardiology and urology.