ELECTROCHEMICAL-BEHAVIOR OF CU UNDERNEATH THIN ELECTROLYTE FILM IN ATMOSPHERE

An electrochemical cell was devised to investigate corrosion electroch emical behavior of metal underneath thin electrolyte film in atmospher e. The Piontelli's type of Luggin-Haber capillary was inserted from th e backward of working electrode. The results show that. cathodic proce ss on Cu is mainly affected by the thickness of the electrolyte film o f 0.5 mol/L HCl+1 mol/LNa2SO4 aqueous solution and its anodic dissolut ion changed from Tafel region to limiting diffusion current. Moreover, the corrosion potential of Cu in due media will increase with decreas e of the thickness of the film.