Synthesis and theoretical studies of novel conjugated polyazomethines and their application as efficient inhibitors for C1018 steel pickling corrosion behavior

Abstract

The idea of the existing work is to progress the preparation of four conjugated polyazomethines contained thiazole through the backbone of the polymer. The synthesized conjugated polyazomethines were categorized and assessed as novel inhibitors for the C1018 steel pickling corrosion behavior at 298–328 K using surface morphology of C1018 steel electrode, potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The assessed polymers performed as effective inhibitors for C1018 steel corrosion in pickling solution. The protection capacity of the polyazomethines augmented with a rise in concentration to attain 98.2% efficacy with 150 mg L − 1 at 298 K. PDP plots designated that the conjugated polyazomethines performs as mixed-type inhibitors and adsorbed on the C1018 steel interface via chemisorption. Isotherm model of Langmuir was found the preeminent mode for the adsorption of polymers. The surface morphology examinations established the development of a protective layer getting a thick coverage at the optimal dose. Moreover, theoretical study of Monte Carlo (MC) simulations and density functional theory (DFT) were used to govern the association among protection capacity and molecular structure. This study could be provided novel polyazomethines inhibitors for C1018-steel corrosion protection in different industrial environments, especially in the pickling solution.