Abstract
Six amino acids were evaluated as corrosion inhibitors for carbon steel
and copper in 0.5 mol L-1 H2SO4 solution by potentiodynamic polarization
and electrochemical impedance techniques allied to Density Functional
Theory (DFT) and Monte Carlo computations The corrosion inhibitor
rankings were: Arg >Gln >Asn >Met>Cys >Ser, for copper, and Met>Cys >Ser
>Arg >Gln >Asn, for carbon steel. The DFT approach failed to explain the
corrosion inhibition rating based on the HOMO and LUMO energies of the
isolated amino acid molecules, while the simpler classical Monte Carlo
approach, performed considering the interaction energies between the
corrosion inhibitor and the metallic substrate, was successful. (C) 2016
Elsevier Ltd. All rights reserved.
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