Abstract
The current research reports the performance of choline histidine ionic liquids ([Ch][His]) as novel corrosion inhibitor for mild steel in 3.5 wt% NaCl solution. According to the experimental findings, [Ch][His] significantly inhibit the mild steel corrosion. The inhibition efficiency is positively correlated with the inhibitor concentration and negatively correlated with the temperature. Optimal inhibition efficiency was 89.8 %, 86.9 % and 84.0 % for weight-loss analysis, polarization test (PDP) and electrochemical impedance (EIS) at 3000 ppm. The surface analysis visualized that the surface of mild steel was less corroded and damaged in the solution containing [Ch][His] compared to the blank solution. The [Ch][His] showed the anodic type of mild steel corrosion inhibition with both chemisorption and physisorption nature following Langmuir adsorption isotherms. MD simulation and Quantum chemical calculation evidenced that [Ch][His] forms a barrier film on the mild steel surface, confirming the experimental results.
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