The Ti substrates of IrO2-Ta2O5 coated anodes were treated by solid-solution and aging,stress relieving annealing,and recrystallization annealing,and the coatings were prepared by thermal decomposition of a mixture of H2IrCl6·6H2O dissolved in hydrochloric acid and TaCl5 dissolved in alcohol.Scanning electron microscopy (SEM),cyclic voltarnmetry (CV),electrochemical impedance spectroscopy (EIS),and accelerated life test (ALT) were employed to study the microstructure and electrochemical properties of the anodes.Compared with the anode without heat treatment,the anodes with heat treatment are of higher electrochemical activity and longer accelerated life; especially,the anode with recrystallization annealing treatment has the best electrochemical properties and the longest accelerated life.
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