Corrosion inhibition studies on mild steel in HCl by a newly synthesized benzil monohydrazone based Schiff base

• Published in: Journal of the Indian Chemical Society 2021-12, Vol.98 (12), p.100245, Article 100245
• Main Authors: Panda, Aruna Kumar, Purohit, Aditya Kumar, Upadhyay, Ankita, Sahoo, Malay K., Kar, Pravin Kumar
• Format: Article
• Language: English
• Subjects: Corrosion; Mild steel; Schiff's base; SEM; Tafel polarization
• ISSN: 0019-4522
• DOI: 10.1016/j.jics.2021.100245

The corrosion inhibition effect of newly formulated Schiff base 2-((E)-((E)-2-hydrazone-1, 2-diphenylethylidene) amino phenol) (HDAP) ligand L derived from Benzil monohydrazone and 2-Aminophenol on mild steel in 1 ​M HCl was examined. Electrochemical (Tafel and EIS) and mass loss techniques were employed to evaluate its corrosion protection efficiency. The inhibition efficiency (η %) was elevated with raise in concentration of compound L. Maximum inhibition efficiency of 94.18% was obtained at 0.01 ​M concentration of HDAP from Tafel polarisation curve. From electrochemical impedance (EIS) studies, it was confirmed that increase in concentration of HDAP led to enhancement of the charge transfer resistance. Both physical and chemical types of adsorptions were observed for the Schiff base via π-bonding electrons which obey Langmuir adsorption isotherm. The SEM picture revealed development of a thin layer on metallic surface. Quantum chemical evaluations were conducted to find out the mechanism of corrosion retardation power of HDAP. [Display omitted] •Synthesis and corrosion inhibition study of new Schiff base 2-((E)-((E)-2-hydrazone-1, 2-diphenylethylidene) amino phenol) (HDAP) ligand L derived from Benzil monohydrazone and 2-Aminophenol on mild steel in 1 ​M HCl.•Weight loss and electrochemical techniques (Tafel and EIS) were used to study its corrosion inhibition efficiency.•The inhibition efficiency (η %) was found to increase with increase in concentration of L, with a miximum of 94.18% at 0.01M concentration of HDAP.•From electrochemical impedance (EIS) studies, it was confirmed that increase in concentration of HDAP led to enhancement of the charge transfer resistance.•Both physical and chemical types of adsorptions were observed which obeyed Langmuir adsorption isotherm.