Pyrimidine derivatives as novel acidizing corrosion inhibitors for {N80} steel useful for petroleum industry: A combined experimental and theoretical approach
By Haque, Jiyaul; Ansari, K. R.; Srivastava, Vandana; Quraishi, M. A.; Obot, I. B.
Published in Journal of Industrial and Engineering Chemistry
2017
Abstract
Abstract The corrosion inhibition performance of two pyrimidine derivatives namely 5-styryl-2,7-dithioxo-2,3,5,6,7,8-hexahydropyrimido[4,5-d] pyrimidin-4(1H) one (PP-1) and 5-(2-hydroxyphenyl)-2,7-dithioxo-2,3,5,6,7,8-hexahydropyrimido[4,5-d]-pyrimidin-4(1H) one (PP-2) on {N80} steel corrosion in 15% {HCl} has been studied using gravimetric method, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, atomic force microscopy (AFM), scanning electron microscopy (SEM), DFT, molecular electrostatic potential and Monte Carlo simulation. The corrosion inhibition efficiencies at optimum concentration (250 mg/L) are 89.1% (PP-1) and 73.1% (PP-2) respectively at 308 K. The corrosion inhibition efficiency increases with increase in concentration and decreases with temperature. {PPs} obeyed Langmuir adsorption isotherm. {AFM} and {SEM} analyses supported formation of protective film on {N80} steel in presence of inhibitors. {DFT} and Monte Carlo simulation calculations supported experimental results.