PROPERTIES OF COATINGS FORMED ON TITANIUM BY MICROARC OXIDATION IN HYPOPHOSPHITE-ALUMINATE ELECTROLYTES

The influence, exerted by changes that occur in hypophosphite-aluminat e electrolytes with their aging on the composition, zone structure, an d the semiconductor, electrochemical, and protective properties of lay ers formed on titanium by microarc oxidation in such electrolytes, are studied by measuring the volt-farad and current-voltage curves and by employing modern analytical techniques intended for the investigation of solutions and solids' surfaces. The experimental results and the m odels proposed are used to explain the reasons for a considerable decr ease in the corrosion currents of steel contacting in sea water titani um, whose surface was treated by microarc oxidation in a hypophosphite -aluminate electrolyte.