Tailoring Hydrophobicity: Synthesis, Characterization and Application of Pyridinium-based Surfactants as Corrosion Inhibitors

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This was due to the effect of the alkyl chain length on the critical micelle concentration (CMC), adsorption behavior, and corrosion inhibition of CR4 mild steel in an acidified chloride solution (3.5 wt.% NaCl, pH 1.5) of a series of pyridinium-based cationic surfactants, namely N-(n-octyl)-2-methylpyridinium bromide (MP8),N-(n-decyl)-2-methylpyridinium bromide (MP10), and N-(n-dodecyl)-2-methylpyridinium bromide (MP12). The synthesized surfactants were characterized by Fourier Transform Infrared (FT-IR) and Nuclear Magnetic Resonance (NMR) spectroscopy, and their critical micelle concentration values were determined using the conductivity measurement technique. Weight-loss measurements, Potentiodynamic polarization, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscope with Energy Dispersive X-ray Spectroscopy (SEM/EDX) and Density Functional Theory (DFT) calculations were used for the assessment of corrosion inhibition performance. The lower CMC was correlated with an increase in the length of the alkyl chains (MP8

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