期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：8
页码：2301-2314
出版社：University of Mohammed Premier Oujda
摘要：Corrosion inhibition by 2-phenyl-1, 4-dihydroquino xaline (PHQ) on carbon steel in 1.0 M HCl is investigated using electrochemical techniques (EIS and Potentiodynamic polarization), SEM and quantum chemical calculation. Inhibition efficiency of 89% is reached with 5×10 -3 M of PHQ at 303 K. Potentiod ynamic polarization showed that the PHQ behaves as mixed-type inhibitor. The Nyquist plots sho wed that increasing PHQ concentration, charge-transfer resistance increased and double-layer capacitance decreased, involving increased inhibitio n efficiency. Adsorption of the inhibitor molecules corresponds to Langmuir ad sorption isotherm. Also, the activation thermodynamic parameters of dissolution were calculated and discussed. Theoretical calculations have been used to make the correlation between the effectiveness of inhibition of our studied inhibitor and their molecular structure.
