Corrosion inhibition of a composite inhibitor containing imidazoline on carbon steel in simulated reverse osmosis product water of seawater

• S.H. Liu¹, Y.N. Wang¹, B.X. Yuan¹, W.T. Dong² and Q.Q. Liao¹

¹ Shanghai University of Electric Power, Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai 20009, China
² Shanghai Fakai Chemical Industry Co. Ltd., Shanghai 201505, China

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.

Keywords: carbon steel, composite inhibitor, simulated RO product water, polarization, EIS, AFM, XRD

Int. J. Corros. Scale Inhib., 2016, 5, no. 4, 325–332 PDF (454 K)
doi: 10.17675/2305-6894-2016-5-4-3

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