Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 298, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2019.112051
Keywords
Synergism; Corrosion inhibition; Dihydropyrimidinones; Biginelli reaction
Funding
- CSIR
- KFUPM
Ask authors/readers for more resources
The adsorption and corrosion inhibition behavior of three dihydropyrimidinone (DHPM) derivatives on carbon steel in 0.5 M sulphuric acid solution is investigated in the present work. It was observed that among the three studied DHPMs; the inhibition efficiency trends were governed by substituent effects where the -OCH3 substituted DHPM provided the best performance (96.05% efficiency) at a concentration of 3.27 x 10(-4) M. The influence of iodide ions is also studied using electrochemical methods, gravimetric studies, and surface analysis. It was observed that the addition of iodide ions further improved the inhibition efficiency to >99% at 3.01 x 10(-4) M concentration of KI. This significant increase in corrosion protection was explained by the synergistic action of DHPM derivatives and iodide ions. The adsorption of the inhibitor obeyed the Langmuir isotherm and exhibited a mixed physical/chemical adsorption. Potentiodynamic polarization studies showed a decrease in both anodic and cathodic reactions at carbon steel/0.5 M H2SO4 interface. The adsorption was supported by scanning electron microscopy study, and the reactivity parameters of the inhibitors were computationally evaluated using DFT analysis and Monte Carlo simulations. (C) 2018 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available