Electrode and method of preparation thereof

An electrode for electrolysis of solutions of electrolytes comprising a support of passivated film forming metal or alloy thereof, having a composite coating consisting essentially of oxides of metals selected from the group consisting of iridium, ruthenium, titanium and tantalum having the molecular ratios (IrO2+RuO2):TiO2+Ta2O5) is (1-19):(3-1) wherein IrO2:RuO2 is (24-4):1, and TiO2:Ta2O5 is 1:(0-0.05). The electrodes are of particular use as anodes in the production of chlorine and alkali, electrosynthesis of chlorates and hypochlorites, electrolysis of sea and waste water and cathodic protection. The electrodes have improved corrosive resistant to alkaline solutions and have improved interface stability to oxidation and blocking.