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：2260-2276
出版社：University of Mohammed Premier Oujda
摘要：The inhibitive action of so me new azo rhodanine derivatives, namely 5-(4'-methoxyphenylazo)-2-thioxo-4-thiazolidinone (I), 5-(phenylazo)-2-thioxo-4-thiazolidinone (II) and 5-(4'-nitrophenylazo) -2-thioxo-4-thiazolidino ne (III) against the corrosion of copper in 2 M HNO 3 solution has been investigated using weight loss, Tafel polarisation, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The inhibition efficiency increased with increasing inhibitor concentrations and decreased with increasing temperature. Potentiodynamic polarisation studies clearly showed that these compounds acted as mixed inhibitors. The ability of the molecule to adsorb on the copper surface obeyed Freundlich adsorption isotherm and was dependent on the active centres and molecular size of the molecules. The thermodynamic activation parameters of the copper corrosion in 2 M HNO 3 were determined and discussed. Molecular modelling was used to gain some insight, about structural and electronic effects in relatio n to the inhibiting efficiencies. Inhibition efficiency values obtained from various methods employed were in reasonable agreement.
