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    Enhanced protection of hybrid polyetherimide-ZnO or CuO bilayer composite coatings against mild steel corrosion in chloride media

    Year: 2022

    Journal: Prog. Org. Coat., Volume 163, FEB

    Authors: Rahali, Emna; Alves, Marta M.; El-Bassi, Leila; Bousselmi, Latifa; Montemor, Maria de Fatima; Akrout, Hanene

    Organizations: Tunisian Ministry of Higher Education and Scientific Research; Fundacao para a Ciencia e a Tecnologia (FCT) [UIDB/00100/2020]

    Keywords: Polyetherimide coating; Zinc oxide; Copper oxide; Mild steel; Corrosion

    Protective bilayer composite coatings based on polyetherimide (PEI) containing ZnO or CuO particles were applied on mild steel (MS) by the sol-gel dip coating method and exposed to aggressive NaCl solutions. Scanning electron microscopy (SEM) analysis revealed the formation of homogenous coatings and X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) analysis confirmed the presence of ZnO or CuO. Although attenuated total reflectance (ATR) proved that the polymer structure was not affected by the presence of the oxide particles, water contact angle revealed that PEI-CuO fallen within the hydrophobic range, whereas PEI alone and PEI-ZnO presented a hydrophilic behaviour. Upon immersion, the PEI-CuO coating was preserved, whereas the PEI and PEI-ZnO coatings were more susceptible to damage and the exposed MS presented different corrosion profiles, depending on being previously coated with blank PEI or PEI-ZnO coatings. The corrosion resistance was investigated by electrochemical impedance spectroscopy (EIS) and demonstrated that the barrier properties of the composite coating and the corrosion resistance of MS, over a short period of immersion, were improved with PEI-CuO. The coating modified with CuO particles, immersed for 8 days in NaCl, presented impedance values above 5 x 10(5) Omega.cm(2), and represented a protective efficiency greater than 99% compared to PEI alone, or to the coating modified with ZnO for which the impedance was in the order of 10(3) Omega.cm(2).Therefore, the most protective composite coating, due to the presence of CuO, brings potential to be explored as an anti-biofouling solution.
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