Electrochemical studies on corrosion inhibition behaviour of synthesised 2-acetylpyridine 4-ethyl-3-thiosemicarbazone and Its Tin(IV) complex for mild steel in 1 M HCl solution

• Published in: Journal of Electrochemical Science and Technology
• Main Author: Hazani N.N.; Mohd Y.; Ghazali S.A.I.S.M.; Farina Y.; Dzulkifli N.N.
• Format: Article
• Language: English
• Published: Korean Electrochemical Society 2019
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85066048786&doi=10.5229%2fJECST.2019.10.1.29&partnerID=40&md5=580c8f6df14458d6429a971374398964

Corrosion inhibition by synthesised ligand, 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (HAcETSc) and its tin(IV) complex, dichlorobutyltin(IV) 2-acetylpyridine 4-ethyl-3-thiosemicarbazone (Sn(HAcETSc)BuCl 2 ) on mild steel in 1 M hydrochloric acid (HCl) was studied using weight loss measurement, potentiodynamic polarisation, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The inhibition efficiency increases by increasing the inhibitor concentrations. The polarisation study showed that both synthesised compounds were mixed type inhibitors. The electrochemical impedance study showed that the presence of inhibitors caused the charge transfer resistance to increase as the concentration of inhibitors increased. The adsorption of these compounds on mild steel surface was found to obey Langmuir’s adsorption isotherm with the free energy of adsorption ΔG o ads of -3.7 kJ/mol and -7.7 kJ/mol for ligand and complex respectively, indicating physisorption interaction between the inhibitors and 1 M HCl solution. © 2019, Korean Electrochemical Society. All rights reserved.