Evaluation of Polyether Copolymer as Green Scale and Corrosion Inhibitor in Seawater

Abstract

AbstractA novel environmentally friendly type of corrosion and scale inhibitor, maleic anhydride-allylpolyethoxy carboxylate copolymer (ML10), was synthesized and characterized by FT-IR and 1H-NMR spectroscopic techniques. The anti-scale property of ML10 in seawater was also studied by static tests for scale and the scale deposits were analyzed by X-ray diffraction (XRD) and SEM, respectively. The results showed that the scale deposits surface morphology and size were changed in the presence of ML10. The performance of the synthesized copolymer as corrosion inhibitor for mild steel corrosion was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) technique. The experimental results indicate that ML10 has a good corrosion inhibition performance and the inhibition efficiency increases with the increase of the ML10 concentration. The adsorption of ML10 obeys Langmuir adsorption isotherm with relatively high value of free energy of adsorption ΔGadsθ. Scanning electron microscopy (SEM) indicated that the corrosion inhibition is due to the formation of a chemisorbed film on the mild steel.