Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 211, Issue -, Pages 135-145Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2015.06.063
Keywords
Mild steel; Pyrimidine derivatives; EIS; Polarization; Corrosion inhibition; DFT
Funding
- North-West University, Department of Science and Technology
- National Research Foundation (DST/NRF) South Africa [92333]
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New pyrimidine derivatives, namely, 7-methoxypyrido [2,3-d]pyrimidin-4-amine (MPPA) and 4-amino-7-methoxypyrido[2,3-d]pyrimidin-2(1H)-one (AMPO) were synthesized and their inhibitive action against the corrosion of mild steel in 15% HCl solution was studied by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Polarization studies showed that both studied inhibitors were of mixed type in nature. The adsorption of inhibitors on the mild steel surface obeys Langmuir adsorption isotherm. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM) were performed for surface study of uninhibited and inhibited mild steel samples. Density functional theory (DFT) was employed for theoretical calculations. (C) 2015 Elsevier B.V. All rights reserved.
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