Fabrication of Green and Smart Anti-Corrosion PDA@Bio-MOF-11@Nano-Curcumin Coating for Mild Steel

Abstract

Corrosion is a destructive phenomenon which occurs spontaneously in the environment and leads to economic, environmental, and safety problems. The focus of recent studies in the field of corrosion is on replacing harmful inhibitors with biocompatible and cheap ones. In this research, the purpose is to synthesize a smart and self-healing coating based on a poly dopamine biopolymer containing Bio-MOF-11@ nano-curcumin as a green inhibitor. The characteristics and morphology of the synthesized materials and the effectiveness of these materials as corrosion-protective coatings were investigated with various techniques including Fourier-Transform infrared spectroscopy (FT-IR), X-Ray diffraction (XRD), ultraviolet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM), and energy dispersive X-Ray analysis (EDS). The UV–vis technique was also used to evaluate the effect of the inhibitor release at pH 4 and 7. The maximum amount of the inhibitor release after 72 hours was 86.61 ppm at pH 4.0. The corresponding electrochemical studies were conducted through electrochemical impedance spectroscopy (EIS) and Tafel plot. Finally, the inhibition rate of the coating was found to be 95.08%, which indicates the good performance of the PDA@Bio-MOF-11@Cur NPs coating for corrosion protection of MS in 3.5% NaCl.