Corrosion Inhibition of Carbon Steel in 0.5 M H2SO4 by New Reduced Schiff Base Ligand

• Published in: Journal of bio- and tribo-corrosion Vol. 8; no. 3
• Main Authors: Jafari, Hojat, Rezaeivala, Majid, Mokhtarian, Nader, Berisha, Avni, Ameri, Elham
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2022; Springer Nature B.V
• Subjects: Adsorption; Atomic force microscopy; Atomic properties; Biomaterials; Carbon steel; Carbon steels; Chemisorption; Chemistry and Materials Science; Corrosion; Corrosion and Coatings; Corrosion effects; Corrosion inhibitors; Corrosion tests; Free energy; Imines; Ligands; Materials Science; Metal surfaces; Microscopy; Polarization; Solid Mechanics; Steel; Sulfuric acid; Surface chemistry; Tribology; Weight loss measurement; Corrosion rate; Free energy of adsorption; Steel; Corrosion inhibitor; Adsorption isotherm
• ISSN: 2198-4220; 2198-4239
• DOI: 10.1007/s40735-022-00679-9

The effect of new reduced Schiff base ligand, named 2,2′-(((2,2-dimethylpropane-1,3-diyl)bis(azanediyl)bis(methylene)disphenol (RSH2), on the corrosion inhibiting of carbon steel in 0.5 M H 2 SO 4 has been studied. The inhibitor effects on the corrosion behavior of the samples were determined at three different concentrations, 1.0, 1.5, and 2.0 mg L −1 . Weight loss, potentiodynamic polarization curves, AC impedance measurements, and atomic force microscopy were utilized to study the corrosion behavior of carbon steel in corrosive environment in the presence and absence of new ligand. Results showed that the inhibition occurs through adsorption of the inhibitors molecules on the metal surface. The inhibition efficiency was found to increase with increasing inhibitor’s concentration. Potentiodynamic polarization data indicated that this compounds act as mixed-type inhibitors. The corrosion efficiency of RSH2 at an optimal concentration of 2 mg L −1 was 81. The adsorption of inhibitors followed the Langmuir isotherm. The value of free energy of adsorption in the presence of the corrosion inhibitor was around − 32 kJ mol −1 , which indicated chemisorption of the molecules. Powerful microscopy was used for the surface morphology studies. The DFT calculations have been demonstrated that the inhibitor is relatively flat-adsorbed on both sides of the phenyl rings.