Abstract
A highly efficient and multifunctional acid corrosion inhibitor is required for carbon steel (CS) in 2 N HCl. N,N′-dimethylaniline (DMA) was explored as an anti-crack, anti-pit agent, and an efficient corrosion inhibitor for CS in 2.0 N hydrochloric acid from 25 to 35 °C. Experimental (immersion, polarization, and impedance) and theoretical methods like DFT, ab-initio, and frequency simulation were used. The morphological study was performed by SEM, metallurgical imaging, Langmuir, and Freundlich isotherms. Theoretical techniques were used to understand the mechanism of adsorption, chemical reactivity parameters, electron density distribution, and molecular orbital energies. Experimental results were supported by the different theoretical studies. Theoretical studies prove strong physio-chemisorption of DMA molecules on CS confirmed by the increase in Warburg impedance, Nyquist loop, and capacitive current with DMA concentration. The maximum depth of pits, percentage porosity, and inhibition efficiency was found to be 678 µm, 84%, and 84.03%, respectively. DMA was proved as a highly efficient and multifunctional corrosion inhibitor for CS thus inhibits the formation of the pit, crack, and uniform corrosion in 2.0 N hydrochloric acid solution.
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Kumar, H., Kumari, M. Highly Efficient and Multi-Functional Corrosion Inhibitor for Carbon Steel at Different Temperatures. J Bio Tribo Corros 7, 159 (2021). https://doi.org/10.1007/s40735-021-00596-3
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DOI: https://doi.org/10.1007/s40735-021-00596-3