APPLYING OF PbO2 DEPOSITION ON AS INERT ANODES FOR CATHODIC PROTECTION PROCESS WHICH USES CURRENT IMPOSE IN THESOIL

Abstract

PbO₂ was electrodeposited by electrochemical depositionmethod on the substrate of 304 stainless steel in alkaline solution including 3.5 M NaOH and saturated PbO, then in acid solutions with various components including 0.5 M Pb(NO₃)₂ and 0.1 M HNO₃ with the presence of 5 g/l TiO₂ , NaF and sodium dodecyl sulfate (SDS). Eight typesof materials on the basis of PbO₂ were used as the inert anodes in the system of cathodic protection by current impose for carbon steel in the soil. The results ofmeasuring the potential of carbon steel cathode according to time, the activity protection system showed that a protective effect of the system which uses PbO₂ anodes is higher than 304 stainless steel and PbSnAg. For the protection system using electrode auxiliary substances, the protective effect of system used anodes on the basis of  PbO₂ reduced but the protective effect of system used 304 stainless steel and PbSnAg increased