Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization Analysis on Anticorrosive Activity of Thiophene-2-Carbaldehyde Derivative in Acid Medium

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 (K ads , ΔG 0 ads ) 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. Experimental2.1. Inhibitor. Heterocyclic Schiff base T2CTRY was synthesized by the condensation of equimolar mixture of thiophene-2-carbaldehyde and tryptophan in ethanol medium. The reaction mixture was refluxed for 3 hours, concentrated, and cooled. The yellow coloured solid was filtered, washed, and dried. Figure 1 shows the molecular structure of the heterocyclic Schiff base T2CTRY. Anal. calcd. for C 16 H 14 N 2 O 2

Electrodeposited Benzothiazole Phthalocyanines for Corrosion Inhibition of Aluminium in Acidic Medium

“…e EI% values calculated using equation S1 in Supplementary Materials are higher for complex 2 than for complex 1 (Table 4) as predicted by transition dipole International Journal of Electrochemistry moment (μ e ) and oscillator strength (f ) discussed above. e value of R ct is a measure of electron transfer across the exposed area of the metal surface, and it is inversely proportional to the rate of corrosion [35]. us, large R ct (and IE %) values are associated with slower corroding process [36].…”

Chemical, electrochemical and tribological study of various olive oils and their behaviour on steel

“…8. This parameter was evaluated based on the determined corrosion current densities using the following expression [26]: As it is seen, the corrosion currents on the film coated by olive oils are smaller only 2-3 times in comparison with bare Fe, and those values make inhibition efficiency at 57-75%. As follows from the corrosion study, the evident correlation between the chemical composition of olive oil and the corrosion behaviour of steel coated by the oil film was not detected.…”

Monitoring the Interaction of Two Heterocyclic Compounds on Carbon Steel by Electrochemical Polarization, Noise, and Quantum Chemical Studies

“…The metal specimens were immersed in the aggressive medium for 4 days at 29 ± 0.2 ∘ C with periodical evaluation of the corrosion rate. The rate of corrosion [21,22] was determined by…”