Journal
CORROSION SCIENCE
Volume 52, Issue 11, Pages 3586-3598Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2010.06.030
Keywords
Mild steel; EIS; SEM; Polarization; Acid corrosion
Funding
- All India Council for Technical Education (AICTE)
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The inhibition effect of 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) on the corrosion of mild steel in hydrochloric acid medium has been investigated using weight loss measurements, electrochemical impedance spectroscopy, potentiodynamic polarization and quantum chemical study. Among the compounds studied, DHPM-3 exhibited the best inhibition efficiency eta (%) 99% at 10 mg L-1 at 308 K. Polarization measurements indicate that all the examined compounds are of mixed-type inhibitor. The adsorption of studied compounds obeyed the Langmuir's adsorption isotherm. The electronic properties obtained using quantum chemical approach, were correlated with the experimental inhibition efficiencies. (C) 2010 Elsevier Ltd. All rights reserved.
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