标题：Electrochemical and chemical quantum studies of a natural alkaloid compound: Boldine, as green corrosion behaviour on carbon steel and Copper in sulfuric acid
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2019
卷号：10
期号：10
页码：1-14
出版社：University of Mohammed Premier Oujda
摘要：The green corrosion behaviour (GCB) of carbon steel and Copper (Cu) were performed
in 0.5 M of sulfuric acid, using Boldine such as green corrosion (GC) inhibitor. The
electrochemical analysis using different concentrations of Boldine was carried out though
Potentiodynamic Polarization Curves (PPC) and Electrochemical Impedance
Spectroscopy (EIS). Also, adsorption isotherms, corrosion rates and quantum chemical
studies were estimated. The results showed that the GCB of Boldine was better for Cu
than carbon steel. The GC inhibition efficiency (GCIE) for Cu through PPC was 87 %
observing that Boldine acts as cathodic inhibitor. The GCIE for Cu by EIS was 89 %. The
diffusion of ions in the cathodic reaction of Cu diminished by a mixture of physisorption
and chemisorption process of Boldine over the metal surface obeying the Langmuir
isotherm model, according to the Gibbs free energy. The quantum chemical calculations
showed that Boldine favorably adsorbed on Cu surface through the electronegative
density atoms such as active centers of adsorption. The theoretical conclusions are
agreement with the experimental data reported.
