Environmentally friendly
three chitosan Schiff bases (CSBs) were
first time synthesized under microwave irradiation by the reaction
of chitosan and aldehydes [benzaldehyde (CSB-1), 4-(dimethylamino)benzaldehyde
(CSB-2), and 4-hydroxy-3-methoxybenzaldehyde (CSB-3)] and characterized
by IR and NMR spectroscopy. The corrosion inhibition performance of
the synthesized inhibitors was studied by the electrochemical impedance
spectroscopy (EIS) and potentiodynamic polarization (PDP). The results
show that all the Schiff bases (CSBs) act as effective corrosion inhibitors
for mild steel in 1 M HCl solution. Among the synthesized Schiff bases,
CSB-3 exhibited the maximum inhibition efficiency of 90.65% at a very
low concentration of 50 ppm. The EIS results showed that the CSBs
inhibit corrosion by the adsorption mechanism. The PDP results show
that all the three Schiff bases are mixed-type inhibitors. The formation
of inhibitor films on the mild steel surface was supported by scanning
electron microscopy/energy dispersive X-ray analysis and Fourier-transform
infrared spectroscopy methods. The adsorption of CSBs on the mild
steel surface obeys the Langmuir adsorption isotherm. The theoretical
studies via density functional theory and molecular dynamics simulation
corroborated the experimental results.
In the present work, N-methyl-N,N,N-trioctylammonium chloride (Aliquat 336) has been evaluated as a green and novel corrosion inhibitor for mild steel in a 1 M HCl solution.
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