1. SREENIVASA M B - Assistant Professor, Centre for Post Graduate Studies, VTU, Mysuru, Karnataka.
2. Dr. M NAGESH - Professor and Head, Department of Civil Engineering, Government Engineering College, Mosalehosahalli,
Hassan, Karnataka.
3. Dr. RAGHU BABU UPPARA - Associate Professor, Department of Civil Engineering, Srinivasa Ramanujan Institute of Technlology,
Anantapura, Andhra Pradesh.
In this study, the corrosion of rebars was examined in simulated concrete pore (SCP) solution containing 2% sodium chloride (NaCl) with different concentrations of natural green corrosion inhibitors, include Azadirachta Indica (AI) and Calotropis Gigantea (CG), ranging from 0% to 3%. Open circuit potential values, and Linear Polarization resistance (LPR), measurements used in the study to evaluate the inhibitors effectiveness in preventing corrosion. Furthermore, a comparison was made between the efficiency of the organic inhibitors and the chemical inhibitor benzotriazole (BTA). According to the findings, the green inhibitors made from leaf extracts showed passive behavior in SCP solution, particularly when compared to samples that had no inhibitors at all. The green inhibitors showed less passive behavior and comparatively higher negative potential values than the chemical inhibitors. In SCP solution containing 2% NaCl, LPR experiments showed that the inhibitors AI and CG achieved corrosion inhibition efficiencies of 38.85% and 16.21% respectively, at a 2% dosage. By comparison, the SCP solution containing BTA at an identical concentration demonstrated a 38.52% efficiency of inhibition. In a similar line, the outcomes of the accelerated corrosion test shown that the organic inhibitors, at a dose of 2%, had higher corrosion resistance than the control, demonstrating their efficacy in preventing corrosion. The specimens treated with benzotriazole exhibited superior corrosion inhibition, as evidenced by their higher time to induce the corrosion crack and lower anodic current, especially at 2% of dosage.
Rebar Corrosion; Leaf Extract Inhibitor; Green Corrosion Inhibitor; Concrete; Lpr; Electrochemical Technique.