Benzothiazole derivatives-based supramolecular assemblies as efficient corrosion inhibitors for copper in artificial seawater: Formation, interfacial release and protective mechanisms

Host-guest assemblies for β-cyclodextrin (β-CD) loaded with 2-mercaptobenzothiazole (MBT) or 2-aminobenzothiazole (ABT) were constructed to distinguish their anticorrosive mechanisms for copper in aqueous phase. Their protective efficacies were assessed by weight-loss, electrochemical, surface and solution analyses for copper in the artificial seawater. Achievements proposed that MBT and ABT were stably incorporated in β-CD with distinct thermodynamic traits, which earned the optimal inhibition efficiencies of 95.6 % and 89.2 % at 0.5 g/L dosage following cathodic-dominated mixed-type inhibition mechanism. Coupling theoretical simulations, varied guest release mechanisms and different bonding strengths of Cu-S and Cu-N accounted for the differentiated inhibition behaviors.