Thiopyrimidine derivatives as new and effective corrosion inhibitors for mild steel in hydrochloric acid: Electrochemical and quantum chemical studies
By Singh, Priyanka; Singh, Ambrish; Quraishi, M. A.
Published in Journal of the Taiwan Institute of Chemical Engineers
NULL
2016
Abstract
Abstract The corrosion inhibition properties of thiopyrimidines derivatives viz. 5-cyano-6-phenyl-2-thioxo-2,3-dihydropyrimidin-4-one (TP-1), 5-cyano-2-thioxo-6-(p-tolyl)-2,3 dihydropyrimidin-4-one (TP-2), 5-cyano-6-(4-methoxyphenyl)-2-thioxo-2,3-dihydropyrimidin-4-one (TP-3), 6-(4-(dimethylamino)phenyl)-5-cyano-2-thioxo-2,3-dihydropyrimidin-4-one (TP-4) were investigated as corrosion inhibitors by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. Among all thiopyrimidines TP-4 exhibited maximum efficiency of 97% at 200 mg L?1. The results of electrochemical studies revealed that all four {TPs} were adsorbed on the metal surface by adsorption mechanism and behave as mixed type inhibitors with predominant control on cathodic reaction. The SEM-EDS/AFM/XPS methods were used to corroborate the mechanism of inhibition.
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