Theoretical study of inhibition efficiencies of some amino acids on corrosion of carbon steel in acidic media: green corrosion inhibitors.
Inhibition efficiencies of three amino acids [tryptophan (B), tyrosine (c), and serine (A)] have been studied as green corrosion inhibitors on corrosion of carbon steel using density functional theory (DFT) method in gas and aqueous phases. Quantum chemical parameters such as EH OMO (highest occupied molecular orbital energy), E LUMO (lowest unoccupied molecular orbital energy), hardness (η), polarizability ([Formula: see text]), total negative charges on atoms (TNC), molecular volume (MV) and total energy (TE) have been calculated at the B3LYP level of theory with 6-311++G** basis set. Consistent with experimental data, theoretical results showed that the order of inhibition efficiency is tryptophan (B) > tyrosine (C) > serine (A). In order to determine the possible sites of nucleophilic and electrophilic attacks, local reactivity has been evaluated through Fukui indices.
Department of Chemistry, University of Sistan and Baluchestan, P. O. Box 98135-674, Zahedan, Iran.
Maryam
M
Dehdab
Department of Chemistry, University of Sistan and Baluchestan, P. O. Box 98135-674, Zahedan, Iran.
Mehdi
M
Shahraki
Department of Chemistry, University of Sistan and Baluchestan, P. O. Box 98135-674, Zahedan, Iran. smhabibikhorassani@yahoo.com.
Sayyed Mostafa
SM
Habibi-Khorassani
D000143:Acids / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D003343:Corrosion; D008958:Models, Molecular; D012694:Serine / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*; D014364:Tryptophan / Q000737:chemistry*; D014443:Tyrosine / Q000737:chemistry*
D000143:Acids; D013232:Steel; D014443:Tyrosine; D012694:Serine; D002244:Carbon; D014364:Tryptophan
Amino acid; Corrosion; DFT; Inhibitory efficiency; Steel