Wyniki 1-1 spośród 1 dla zapytania: authorDesc:"Magdalena Szklarska"

AC impedance study of the corrosion resistance of the passivated Ti15Mo implant alloy in physiological saline solution DOI:10.15199/28.2016.6.7

  The object of this work was the self-passivated Ti-15 wt % Mo implant alloy subjected to anodic oxidation in 1 M acetic acid aqueous solution at 5 V for 1 h. In order to thicken the oxide film a superior biocompatibility and corrosion resistance of the anodized implant was achieved. Surface of the tested alloy before and after anodizing was characterized using X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and profilometry. Electrochemical impedance spectroscopy (EIS) measurements revealed a passive behaviour of the alloy under the experimental conditions. The bilayer oxide film consists of a porous outer layer (6.7±1.0 nm) and a thin, solid inner-barrier layer (1.4±0.3 nm). The obtained film is three times thicker than the oxide layer formed by self-passivation. The electrochemical studies in physiological saline solution (PSS) at 37°C showed that the anodic oxidation improved the corrosion resistance of the Ti15Mo alloy. No pitting corrosion was detected in anodic polarization measurements up to 9.5 V due to the presence of the barrier oxide layer on the alloy surface and phase composition of the examined alloy which contained only β-Ti phase. Key words: Ti15Mo alloy, anodization, oxide layer, corrosion resistance, EIS.1. INTRODUCTION In recent years titanium and its alloys were found to be very popular biomaterials for medical applications due to their excellent mechanical properties, high biocompatibility and good corrosion resistance [1]. Nowadays, toxic metals present in medical titanium alloy are replaced by neutral and non-harmful ones for human body. Among these materials, Ti15Mo alloys can be some examples. Allergenic and carcinogenic elements such as Ni, Al and V have been replaced by a biocompatible molybdenum [2]. Addition of Mo increases the corrosion resistance simultaneously reducing the elastic modulus [3]. If the Mo content is higher than 10[...]

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