Papaver somniferum as an efficient corrosion inhibitor for iron alloy in acidic condition: DFT, MC simulation, LCMS and electrochemical studies

The corrosion resistance of iron alloy in 0.5 M sulphuric acid was checked in the presence and absence of Papaver somniferum ( P. somniferum ) seed extract. Notably, P. somniferum showed 95% corrosion resistance efficiency at 500 mg/L concentration. The adsorption of this inhibitor follows the Langmuir isotherm indicating its monolayer formation on the surface of iron alloy. The potentiodynamic experiments indicated its nature as mixed type of inhibition behaviour. The SEM and AFM techniques were used to study the protective layer on iron alloy. FT-IR with ATR confirmed various functional groups containing heteroatoms present in phytochemicals and formed complex with iron respectively. Theoretical studies were given as a valuable report to understand the comparative adsorption of phytochemical. All acquired outcomes confirmed that P. somniferum seed extract act as an efficient corrosion inhibitor. (c) 2021 Elsevier B.V. All rights reserved.