Synthesis, quantum chemical calculations and corrosion inhibition efficiency of chitosan ionic liquid on API X65 steel surface in acidic environment

摘要

Chitosan ionic liquid (CIL) attracted great attention as green corrosion inhibitors for carbon steel in aggressive environments. The present work synthesize new quaternized N-alkyl chitosan through reaction chitosan with glutraldehyde then addation on NaBH4 solution finally with choloro dodecane. The chemical structure of the prepared polymeric ionic liquid was investigated using FTIR analysis. The corrosion inhibhive effect of the prepared polymeric ionic liquid on steel corrosion in acid chloride solution was studied using different electrochemical techniques. Potentiodynamic polarization data revealed that the prepared ionic liquid reduces both dissolution and hydrogen evolution corrosion reactions. Impedance technique shows one capacitive loop that indicated the charge-transfer process of the steel corrosion The quantum chemistry calculations were carried out to study the molecular geometry and electronic structure of obtained derivatives. The energy gap between the highest occupied molecular orbital and lowest unoccupied molecular orbital has been calculated using the theoretical computations to reflect the chemical reactivity and kinetic stability of compounds.