The influence of oxygen amount in oral cavity media on the corrosion behavior of nanostructures formed on anodized Zr

Abstract

The aim of this study is to investigate the corrosion behavior of anodized Zr in oral cavity environment simulated by Afnor saliva as a function of the amount of dissolved oxygen. For comparison, non treated Zr was also investigated in the same conditions. In order to study the corrosion behavior at open circuit potential versus time, cyclic potentiodynamic polarization (CPP) and electrochemical impedance spectroscopy (EIS) were performed. scanning electron microscopy (SEM) with energy dispersive X‐ray (EDX) imaging was used to observe the morphology and topography of the modified electrodes. Experimental data show that the decrease of oxygen concentration leads to the inhibition of the corrosion process for non treated Zr and Zr covered with nanotubes. A range of electrochemical stability of zirconia nanotubes in artificial Afnor saliva as a function of oxygen content in simulated oral cavity environment was established.

Micro and Nanostructure Surface and Interface Characterization of Anodized Zr in Two Different Electrolytes

“…With a passive film, Zr presents an excellent resistance to corrosion in a variety of conditions, such as organic solutions, alkalis and acids and can be considered a promising and useful material that can be used in applications such as oxygen sensors, 3 protective coating materials in optical devices, 4 photocatalysts in environmental applications 5 and catalysts for fuel cells. 6 It is to mention that Zr is considered one of the most biocompatible elementsand a good choice for restorative works in oral cavity, [7][8][9] being a competition for Ti and Ti alloys. 10,11 Oral cavity environ-ments are very aggressive not only because of saliva, but for their varying pH content as well, and the excellent resistance to corrosion of Zr and Zr alloys especially in combination with Ti is a strong point for recommendation as biomaterial.…”