POLARIZATION BEHAVIOR OF STEEL SOLID-ELECTROLYTE INTERFACE AND THE ANTICORROSION EFFECT

This paper investigates the potential application of Na-beta-alumina a nd silica gel electrolyte containing various phosphorates for steel pr otection under environmental conditions where no any other continuous ion conducting materials would exist on the steel surface. The experim ental results showed that the open circuit potential of the steel/soli d electrolyte interface versus the platinum reference electrode origin ated from the corrosion of steel by oxygen gas and water that penetrat ed through the electrolytes. It was revealed that the cathodic and ano dic polarization behaviour of steel was affected by factors such as th e nature of electrolyte, the temperature and the relative humidity. Ef fective cathodic protection has been demonstrated, with some indicatio ns of the change at the steel/solid electrolyte interface provided by complex impedance analyses.