Open AccessElectrochemical, Quantum Chemical and Surface Analysis Studies using Novel Schiff Bases for the Inhibition Mild Steel Corrosion in Sulphuric Acid Medium
Author(s) -
M. Ragu,
Periyakaruppan Karuppasamy,
J. Thirupathi,
M. Ganesan,
T.V. Rajendran,
Veluchamy Kamaraj Sivasubramanian
Publication year - 2022
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2022.23588
Subject(s) - chemistry , electrochemistry , dielectric spectroscopy , adsorption , scanning electron microscope , quantum chemical , corrosion , schiff base , polarization (electrochemistry) , nuclear chemistry , atomic force microscopy , inorganic chemistry , analytical chemistry (journal) , molecule , polymer chemistry , organic chemistry , nanotechnology , materials science , electrode , physics , quantum mechanics
The influence of two newly synthesized salophen Schiff bases, namely N,N′-bis(5-nitrosalicylidene)-1,2-phenylenediamine (BNSPD) and N,N′-bis(5-chlorosalicylidene)-o-phenylenediamine (BCSPD),for inhibiting mild steel corrosion was investigated using potentiodynamic polarization, weight lossand electrochemical impedance spectroscopy in 0.5 M H2SO4 media. The results indicated that theinhibition efficiency of the inhibitors increased and decreased with the increase in the inhibitorconcentration and temperature, respectively. Potentiodynamic polarization measurements revealedthat the two inhibitors exhibited mixed type. The standard free energy (ΔGºads) and equilibrium constantof adsorption (Kads) were calculated. Scanning electron microscopy (SEM) and atomic force microscopy(AFM) techniques were used to investigate the surface morphology of the mild steel in the absenceand presence of inhibitors. DFT calculations were performed to correlate the molecular structure andquantum chemical parameters with inhibition performance.