Abstract
The corrosion inhibition efficiency of thiophene-2-carbaldehyde tryptophan (T2CTRY) on mild steel (MS) in 1 M HCl solution has been investigated and compared using weight loss measurements, electrochemical impedance spectroscopy, and potentiodynamic polarization analysis. The Schiff base exhibited very good corrosion inhibition on mild steel in HCl medium and the inhibition efficiency increased with the increase in concentration of the inhibitor. The adsorption of the inhibitor on the surface of the corroding metal obeys Freundlich isotherm. Thermodynamic parameters (Kads, ΔG ads0) were calculated using adsorption isotherm. Polarization studies revealed that T2CTRY acts as a mixed type inhibitor. A maximum of 96.2% inhibition efficiency was achieved by EIS studies at a concentration of 1 mM.
Highlights
Several Schiff bases were tested as corrosion inhibitors and it is reported that converting an amino compound into Schiff base increases the inhibition efficiency
The application of Schiff bases as an effective corrosion inhibitor is mainly based on their ability to form a monolayer on the surface of the corroding material.Increasing efforts have been made to study the corrosion behaviour of metals and mechanism of inhibition during the past decade mainly through electrochemical investigations [8,9,10,11]
The variation of corrosion rate and inhibition efficiency with immersion time was determined by weight loss measurements for a period of five days in the presence and absence of the Schiff base T2CTRY
Summary
Several Schiff bases were tested as corrosion inhibitors and it is reported that converting an amino compound into Schiff base increases the inhibition efficiency. Due to the presence of C=N– group and electronegative N, S, or O atoms in the molecule, Schiff bases should be good corrosion inhibitors [1,2,3,4]. The action of such inhibitors depends on the specific interaction between the functional groups and the metal surface. The application of Schiff bases as an effective corrosion inhibitor is mainly based on their ability to form a monolayer on the surface of the corroding material.Increasing efforts have been made to study the corrosion behaviour of metals and mechanism of inhibition during the past decade mainly through electrochemical investigations [8,9,10,11]. The anticorrosive activity of this compound was evaluated by weight loss measurements, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization analysis
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