Abstract :
Corrosion inhibitors of daidzein, galangin, genistein, naringenin and luteolin
compounds have been studied using the Density Functional Theory (DFT) method
with the basis set B3LYP/6-31G using the Gaussian program. To prevent corrosion,
organic inhibitors are needed which are safe for the environment. Therefore,
researchers are looking for other organic inhibitors that have the potential to prevent
corrosion. The calculated quantum chemical parameters are EHOMO, ELUMO, gap
energy (?E), ionization potential (I), electron affinity (A), electronegativity (X),
hardness (?), softness (?), electrophilicity (?), nucleophilicity (?), mulliken charge
density, back-donation energy (Eb-d), electron transfer (?N), adsorption energy (Eads),
and bond energy (Ebinding). Theoretical calculations show that naringenin is a good
inhibitor compared to other compounds so that it can be used as an alternative
organic inhibitor to replace luteolin. In this research, naringenin is a compound that
has the potential as an inhibitor as seen from the structure and parameter
calculations that have been carried out, so that naringenin can be used as an organic
inhibitor to replace luteolin. The theoretical order of increasing inhibition is naringenin
> genistein > galangin > daidzein. This theoretical study will greatly contribute to the
experimental research of organic inhibitors because the theoretical increase in
inhibition is already known.
Keywords: Corrosion Inhibition,