Corrosion testing of platinum metals CVD coated titanium anodes in seawater-simulated solutions

A chemical vapour deposition (CVD) technique is widely used for the prepara tion of protection coatings. In the present work titanium anodes with CVD c oatings of iridium, platinum and Ir-Pt composite were made. The coatings we re obtained by thermolysis of platinum(II) acetylacetonate and iridium(III) acetylacetonate in the oxygen or hydrogen contained atmosphere. The invest igation of the samples by means of XPS showed the presence of oxide phases in the coatings. Tests of the resulting samples in the electrolysis of seaw ater-simulated solutions under active evolution of oxygen were conducted. P latinum coatings were found to be more stable than iridium ones, which is, to a substantial extent, due to mechanical strain at the titanium-to-coatin g boundary. Iridium-coated titanium foil anodes were tested in an experimen tal electrodialysis unit. Their service life exceeded 1 year.