Nickel base superalloys have been widely used for manufacturing key structural materials for aircraft engine blades. These alloys are developed to withstand the most deleterious degradation mechanisms as creep damage, fatigue, loss of thermal stability and environmental attacks as oxidation and hot corrosion during service. The damages can compromise the structural integrity of the aircraft and in the next generation of advanced engines they will require even higher gas temperature. Consequently, much work has been done in order to develop protective approaches that will increase component lifetimes and meet the development of advanced gas turbine engines. One of such is the used of thermal barrier coatings (TBCs). Thus the aim of the present investigation is to study the electrochemical behavior of YSZ coatings deposited by physical vapor deposition (PVD) on an aeronautical nickel based superalloy to improve the oxidation resistance. The electrochemical techniques conducted on Incoloy 800HT substrates, show that the corrosion velocity decreased with the YSZ coating system.