A study on the mixed corrosion inhibitor with a dominant cathodic inhibitor for mild steel in aqueous chloride solution

Abstract Lanthanum diphenylphosphate compound (La(dpp) 3 ) has been developed as an effective corrosion inhibitor system for controlling the dominant cathodic process of the electrochemical reaction on mild steel surface immersed in an aqueous chloride solution. The study has clearly demonstrated that less corrosion attack has been shown on the steel surface of steel coupons immersed in solutions containing La(dpp) 3 compound even at low concentrations. This research has also proved that the La(dpp) 3 compound improves the inhibition effectiveness with an increase in inhibitor concentrations, resulting in the superior protective film and charge transfer resistances, as well as protective film and double layer CPE magnitude values.