Effect of a New Synthesized Schiff base Containing Thiophene Rings on Carbon Steel Corrosion in HCl Solution

In the present work, the corrosion of carbon steel in 1.0 molL–1 HCl was investigated in the presence of new synthesized inhibitor, 2-methyl-N'-(di(thiophen-2yl)methylene)benzohydrazide (DTBH) by Potentiodynamic polarization (PDP), Electrochemical Impedance Spectroscopy (EIS) and Weight Loss (WL) measurements. Polarization studies showed that DTBH acted as a mixed-type corrosion inhibitor with predominantly anodic inhibition effect. EIS results confirmed the adsorptive type of the inhibitor, which increased the polarization resistance of the corrosion reaction. Based on the weight loss results, maximum inhibition efficiency was obtained 92.0% at the concentration of 300 ppm of DTBH. It was also shown that the adsorption of DTBH obeys Langmuir isotherm with mainly chemisorption.