Interaction of Dental and Maxillofacial Keradent-1 Alloy with Oral Cavity Electrolyte

Abstract

The methods of potentiodynamic polarization curves and quantitative Auger-electron spectroscopy are used to establish the formation of a multilayer protective film in the interaction of dental and maxillofacial Кеradent-1 alloy with the oral cavity electrolyte (3% NaCl solution). It is shown that the first (inner) layer of the protective film (30 nm thick) represents a solid solution of oxygen in the metals of alloy and the outer film layer consists of three parts: CoО oxide (5 nm thick) at the boundary with the solid solution of oxygen, a mixture of CrO and CoO oxides (3 nm thick) in the middle, and Cr₂CoO₄ spinel (2 nm thick) in the outer layer. The experiment and calculations using the Faraday law show the number of Cr³⁺, Co²⁺ and Ni²⁺ ions that pass into the solution during electrolysis. It is shown that these numbers are almost one three-hundredth of the admissible concentrations of these metals in the oral cavity.