Abstract
Aluminum metal and its alloys are most precious metals in industries, marine, and aircraft applications due to its interesting properties. However, aluminum metal undergoes corrosion in presence of aggressive chloride environments. Sol-gel based protective coating is mainly used to safeguard aluminum metal from corrosive chloride environments. In the present work, inorganic and polymeric composite corrosion inhibitors were synthesized for Al protection in aqueous 3.5% NaCl media (Zr and chitosan were hybridized using silanes). Surface morphology and chemical composition were duly characterized via FTIR and SEM-EDX, while corrosion resistivity was investigated by impedance (EIS) and polarization studies (PDS). Further, molecular modeling studies were performed to understand the corrosion inhibition mechanism and reveal those factors influences the corrosion efficiency of the chitosan-doped hybrid corrosion inhibitors.Chitosan-doped Hy/Zrnanocomposite sol-gel coating shown higher corrosion resistance of 96.1% than a hybrid (Hy) and Hy/Zr sol-gel coating. PDS showed that the chitosan-doped Hy/Zr sol-gel coating protects the Al metal by an anodic dissolution process. Computational chemistry and molecular dynamics study further evident the chitosan-doped Hy/Zr sol-gel coating enhanced the corrosion resistance of the Al substrates by lowering the molecular orbital gap energy and enhancing the adsorption of the corrosion inhibitors.
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Highlights
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A new carbohydrate polymer, Chitosan is doped with Hy/Zrbio-nanocomposite sol–gel based coating over Al metal.
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Chitosan doped-Hy/Zr nanocomposite sol–gel coating is successfully fabricated and analyzed.
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The maximum protection efficiency of Chitosan doped-Hy/Zr nanocomposite sol–gel coating is 96.14%.
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DFT and MDs values are accordance with inhibition efficiency of modified Al metal.
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This research was supported by Basic Science Research Program (grant number: 2020R1I1A1A01068071) through the National Research Foundation (NRF) funded by the Ministry of Education of Korea.
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Balaji, J., Bothi Raja, P., Sethuraman, M.G. et al. Experimental and multiscale simulation studies on Chitosan doped Hybrid/Zirconium—a bio-nanocomposite coating for aluminium protection. J Sol-Gel Sci Technol 100, 341–351 (2021). https://doi.org/10.1007/s10971-021-05642-7
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DOI: https://doi.org/10.1007/s10971-021-05642-7