Abstract
The addition of polyanions can greatly reduce the permeability of native chitosan coatings through ionic crosslinking, improving their stability and anticorrosive properties. Three different solutions made from high viscosity chitosan are used to produce coatings with a varying thickness on zinc. The native chitosan films are then ionically crosslinked with indigo carmine by dip** the coated samples in 10–3 M aqueous indigo carmine solution. The electrochemical properties of the coatings are studied by potentiodynamic polarization and electrochemical impedance spectroscopy methods. The surface morphology and elemental composition of the coated samples before and after corrosion are also investigated using SEM-EDS. As expected, the viscosity of the chitosan solutions, and, consequently, the thickness of the coatings can greatly influence their anticorrosive properties. The application of too thin or too thick films results in incomplete coating or swelling gradients with negative effects such as cracks appearing. Adequate thickness of high viscosity chitosan coatings results in inhibition efficiencies (~90%) similar to those resulting from medium viscosity chitosan.
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ACKNOWLEDGMENTS
The authors would like to thank the financial support provided by the Romanian Ministry of National Education and Dr. Lucian Barbu Tudoran for his help in the EDS and SEM measurements.
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Szőke, Á.F., Szabó, G., Katona, G. et al. Correlations between the Chitosan Solution Viscosity and the Anticorrosive Protection Efficiency of Indigo Carmine-impregnated Chitosan Coatings on Zinc. Prot Met Phys Chem Surf 58, 574–584 (2022). https://doi.org/10.1134/S2070205122030224
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DOI: https://doi.org/10.1134/S2070205122030224