Cost
effective inhibition of mild steel corrosion employing eco-friendly
materials is a high priority subject for industries these days. Therefore,
in this work, a series of N-(benzo[d]thiazole-2-yl)-1-phenylethan-1-imines [N-(benzo[d]thiazole-2-yl)-1-phenylethan-1-imine (BTPEI), N-(benzo[d]thiazole-2-yl)-1-(3-chlorophenyl)
ethan-1-imine (BTCPEI), N-(benzo[d]thiazole-2-yl)-1-(m-tolyl) ethan-1-imine (BTTEI),
and N-(benzo[d]thiazole-2-ylimino)
ethyl) aniline (BTPIA)] for mild steel protection in 1 M HCl were
explored by adopting methods like gravimetric analysis, adsorption
isotherms, and electrochemical methods, for example, electrochemical
impedance spectroscopy (EIS) and potentiodynamic polarization. Different
spectral characterization methods such as FTIR and 1H NMR
were used to confirm the synthesized derivatives. The experimental
results affirmed that all of the inhibitors are proven to be very
efficient for combating corrosion for mild steel in acidic media.
The determined thermodynamic and activation parameters were used to
provide a further understanding of the mechanism of inhibitive activity.
The computed Gibbs free energy values suggested strong chemical interaction
of inhibitors with the mild steel surface, thereby supporting chemisorption.
Potentiodynamic polarization data explained the mixed type nature
of all of the inhibitors. Impedance measurements point out that protective
film deposits on the mild steel in the presence of the inhibitors.
Studies like scanning electron microscope (SEM) with electron dispersive
X-ray spectroscopy (EDS), atomic force microscopy (AFM), and X-ray
photoelectron spectroscopy (XPS) further supported the adsorption
inhibitive mechanism. The theoretical findings such as density functional
theory (DFT), Fukui indices, and molecular dynamics (MD) provided
good agreement with different experimental techniques.
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