Plasma Electrolytic Oxidation Ceramic Coatings on Zirconium (Zr) and ZrAlloys: Part I—Growth Mechanisms, Microstructure, and Chemical Composition

Recently, a significant number of research projects have been directed towards designing and developing ceramic coatings for zirconium-based substrates due to their outstanding surface properties utilization in modern technologies. The plasma electrolytic oxidation (PEO) coating is an environmentally friendly wet method that can be performed wide range electrolytes. characteristics PEO tailored by changing electrochemical parameters, electrolyte composition, substrate alloying elements adopt conformal adhesive the final demanding applications chemical, electronics, energy This review focuses on deriving deeper fundamental understanding growth mechanisms effect process parameters transient discharge behavior at breakdown, initiation, oxide layer incorporating species from electrolyte. It highlights microstructural associated with structural defects, phase transformation, role additives.