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- Title
Multidentate Schiff bases as new and effective corrosion inhibitors for mild steel in hydrochloric acid solution: an electrochemical and quantum chemical assessment.
- Authors
Sadeghi Erami, Roghayeh; Amirnasr, Mehdi; Raeissi, Keyvan; Momeni, Mohamad; Meghdadi, Soraia
- Abstract
Three multidentate Schiff base ligands ( A = 3-(2-aminobenzylimino)-1-phenylbutan-1-one], Hbzacabza; B = 3-[({o-[(E)-(o-Hydroxyphenyl)methylideneamino]phenyl}methyl)imino]-1-phenyl-1-buten-1-ol, Hbzacabzasal; and C = 3-[({o-[(E)-(2-Hydroxy-1-naphthyl)methylideneamino]phenyl}methyl)imino]-1-phenyl-1-buten-1-ol, Hbzacabzanapht) were synthesized and their inhibiting effect on the corrosion of mild steel in 1 M hydrochloric acid was examined using potentiodynamic polarization and electrochemical impedance spectroscopy. These compounds are effective corrosion inhibitors with inhibition efficiency A < B < C. The adsorption of inhibitors obeys Langmuir adsorption isotherm and the thermodynamic parameters K, Δ Gº, E are extracted. The order of K and E values conforms to the observed inhibition efficiency of these compounds. The values of Δ Gº are close to −40.00 kJ/mol (in the range of −33.01 to −35.04 kJ/mol) and indicate that the corrosion inhibition effect involves both chemisorption and physisorption followed by the blocking of the active electrochemical sites on steel surface. The effect of A, B and C on mild steel was also studied by quantum chemical calculations. Graphical Abstract: [Figure not available: see fulltext.]
- Subjects
SCHIFF bases; HYDROCHLORIC acid; NONCARBOXYLIC acids; INORGANIC acids; ACID solutions
- Publication
Journal of the Iranian Chemical Society, 2015, Vol 12, Issue 12, p2185
- ISSN
1735-207X
- Publication type
Article
- DOI
10.1007/s13738-015-0696-7