Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 222, Issue -, Pages 671-679Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2016.07.119
Keywords
Q235 steel; Corrosion inhibition; Polarization curves; EIS; SEM/EDX; FTIR; XPS
Funding
- National Natural Science Foundation of China [51171094]
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The inhibition effect of 2-(quinolin-2-yl)quinazolin-4(3H)-one on the corrosion of Q235 steel in 1 mol/L HCl solution was investigated by means of potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) methods. The experimental results reveal the 2-(quinolin-2-yl)quinazolin-4(3H)-one has a good inhibiting effect on corrosion of Q235 steel in 1 mol/L HCl solution. Polarization studies show that the 2-(quinolin-2-yl)quinazolin-4(3H)-one is a mixed type inhibitor. The adsorption of the inhibitor on steel surface obeys Langmuir adsorption isotherm and contains both physisorption and chemisorption. On the basis of surface analysis and characterization, the formation and characteristic of an adsorption-related protective inhibitor film on the steel surface have been verified. Finally, the mechanisms of corrosion and protection of the Q235 steel by the quinoline derivative inhibitor have been proposed. (C) 2016 Elsevier B.V. All rights reserved.
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