Ab-Initio and DFT Calculations on Some Inorganic Inhibitors Computaional Study on Inorganic Corrosion Inhibitors
Abstract
Some electronic structure
descriptors are calculated by using HF and MP2 which are ab-initio methods and B3LYP
method with SDD, SDDALL, CEP-4G, CEP-31G, CEP-121G and QZVP basis sets in vacuo
and water for CO32-, HCO3-, H2CO3,
SO42-, HSO4-, H2SO4,
PO43-, HPO42-, H2PO4-
and H3PO4 which are used as inorganic corrosion
inhibitors. In a summary, MP2/SDDALL level in water is found as the best level.
The active sites of these inhibitors are determined by natural bond orbital
(NBO) charge analyses, molecular orbital character analysis, proton affinity of
mentioned inhibitors and Fukui functions. According to the fraction of
electrons transferred, the inhibition efficiency ranking is found as CO32-
> PO43- > HPO42- > HCO3-
> SO42- > H2PO4-
> H2CO3 > HSO4- > H3PO4
> H2SO4 in MP2/SDDALL level in water.
Keywords
Inorganic Compounds,Ab initio and DFT calculations,Computational Techniques,Corrosion Inhibitors.
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