A comparative study of inorganic versus organic corrosion inhibitors for mitigation of steel in chloride contaminated alkaline solution

Abstract

Inorganic inhibitor like calcium nitrite is identified as an effective corrosion inhibiting admixture for rebar corrosion problem in concrete structures. But leaching of calcium nitrite results under dosage leading to pitting corrosion of rebars in presence of chloride. Hence the objective of the present investigation is to develop an alternative corrosion inhibiting system. Disodium phthalate is identified as an alternative system. The efficiency of the system was evaluated by conducting solubility limit test, gravimetric test, potentiodynamic polarization, anodic passivation and electrochemical impedance studies. From the above tests conducted it was proven beyond doubt that the organic inhibitor studied may be considered as an effective corrosion inhibitor than the inorganic type.