Adsorption and Corrosion Inhibition Effect of Schiff Base Ligands on Low Carbon Steel Corrosion in Hydrochloric Acid Solution. Issue 6 (2nd June 2016)

• Record Type: Journal Article
• Authors: Soltani, N.; Salavati, H.; Rasouli, N.; Paziresh, M.; Moghadasi, A.
• Is Part Of: Chemical engineering communications. Volume 203:Issue 6(2016)
• Page Start: 840
• Page End: 854
• Publication Date: 2016-06-02
• Subjects: Acid corrosion inhibitors -- Carbon steel -- EIS, Polarization -- Schiff base; Chemical engineering -- Periodicals; 660.205
• DOI: 10.1080/00986445.2015.1076801
• Languages: English
• ISSNs: 0098-6445

Abstract

Abstract : In this study, the corrosion inhibition of low carbon steel in 2.0 mol L −1 HCl by N, N′-bis(salicylidene) benzidine (Schiff base A) and N, N´-bis(5-nitrosalicylidene) benzidine (Schiff base B) has been studied using chemical (weight loss) and electrochemical (potentiodynamic polarization and electrochemical impedance spectroscopy, EIS) measurements. Polarization curves reveal that the used compounds are mixed-type inhibitors. Results show that the inhibition efficiency increases when the inhibitor concentration increases and the inhibition efficiency follows the order: Schiff base B > Schiff base A. The obtained experimental data fitted Langmuir adsorption isotherm. Also, associated activation parameters ( E a, Δ H *, and Δ S *) and the thermodynamic adsorption parameters ( K ads, Δ ) were calculated and discussed. Quantum chemical calculations were performed to theoretically define the relationship between molecular structure and inhibition efficiency of Schiff base A and Schiff base B.