Abstract
The synergistic performance of corrosion inhibition of 2-undecyl-N-carboxymethyl-Nhydroxyethyl imidazoline (UHCI) and ZnSO4 on 20# carbon steel surface in simulated reverse osmosis product water of seawater was investigated by electrochemical methods, scanning atomic force microscopy (AFM) and X-ray diffraction (XRD). The results show that the composite inhibitor acts as a mixed type inhibitor, reducing the corrosion of carbon steel effectively and the inhibition efficiency reaches the best values when the mass concentration ratio of UHCI and ZnSO4 is 50 : 50 at the total concentration of the solution is 100 mg·L where the corrosion inhibition efficiency reaches 96.99%. The UHCI molecules adsorbed on metal surfaces, controlling the anodic reaction. ZnSO4 is deposited on the metal surface in the form of Zn(OH)2, controlling the cathodic reaction.
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