Corrosion inhibition of 1-benzyl-4-((benzyloxy) methyl)-1H-1,2,3-triazole (BBT) for C844 bronze in saline medium and theoretical study

abstract

© 2022 Elsevier B.V.The corrosion inhibition efficiency of 1-benzyl-4-((benzyloxy)methyl)-1H-1,2,3-triazole (BBT) with a different concentration on C844 bronze in NaCl 3% was investigated by electrochemical impedance spectroscopy (EIS). On the other hand, the surface of the samples was characterized before and after the corrosion experiments and with the presence of Paraloid-B72 coating using scanning electron microscopy (SEM-EDS). The results showed that the best concentration as corrosion inhibition was at 100 ppm with 87% inhibition efficiency, and coating with 10 mg/m2 of Paraloid + BBT reached 89.8%. Accordingly, the Langmuir adsorption isotherm was found to be a suitable parameter for correlating the experimental results with a possible protection mechanism. The film persistence showed better durability by controlling the corrosion process during 450 h of immersion by presenting higher load transfer resistance values. Assuming a cluster-model approach, density functional theory calculations were used to elucidate the BBT-metal surface interactions. The physical part of the mixed-type adsorption of BBT can be rationalized by the electrostatic interactions between BBT molecule and the surface metal atoms. In contrast, the chemical component of the adsorption process is due to the covalent bonding with the metal surface through oxygen atoms as well as the nitrogen atoms in the triazole moiety. Condensed Fukui indices point to the formation of an almost chemically inert layer, against nucleophilic and electrophilic attacks, on the metal surface. Finally, SEM-EDS shows good protection against the corrosion process decrease with BBT inhibitor and coating + BBT.