Abstract
The inhibitive performance of Trisodium Phosphate (TSP) in controlling corrosion of rebar steel immersed in simulated concrete pore solution prepared in well water in the absence and presence of Zn2+ has been evaluated by the weight loss method. The formulation consisting of 250 ppm of TSP and 50 ppm of Zn2+ offers 95 % inhibition efficiency to rebar steel. Potentiodynamic polarization and electrochemical impedance studies confirmed that a TSP -Zn2+ system function as an anodic inhibitor and the formulation controls the anodic reaction predominantly. Surface analysis by CV, SEM and AFM confirmed the formation of protective layer on the rebar steel surface.
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