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Carbohydr Polym. 2019 Jan 1;203:386-395. doi: 10.1016/j.carbpol.2018.09.038. Epub 2018 Sep 28.

Chitosan oligosaccharide derivatives as green corrosion inhibitors for P110 steel in a carbon-dioxide-saturated chloride solution.

Author information

1
Enhanced Oil Recovery Institute, China University of Petroleum, Beijing 102249, China.
2
Enhanced Oil Recovery Institute, China University of Petroleum, Beijing 102249, China. Electronic address: guojx003@126.com.

Abstract

Two chitosan oligosaccharide derivatives (PHC and BHC) were synthesized for use as corrosion inhibitors. They were characterized using Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The inhibition efficiency of PHC and BHC on P110 steel corrosion in a 3.5 wt.% NaCl CO2-saturated solution at 80℃ was studied using gravimetric measurement, scanning electron microscopy (SEM), atomic force microscopy (AFM), electrochemical analysis, and quantum chemical calculation. The results indicated that inhibition efficiency increased with increasing concentration of inhibitor. Energy dispersive X-ray (EDX), contact angle, and electrochemical impedance spectroscopy (EIS) measurements showed that the inhibitors had been successfully adsorbed to the surface of the P110 steel. The results of potentiodynamic polarization indicated that both compounds were mixed-type inhibitors.

KEYWORDS:

(1)H-NMR; CO(2) inhibition; Chitosan oligosaccharide derivatives; EDX; Green inhibitors; P110 steel

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