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    Enhanced corrosion inhibition of low carbon steel in aqueous sodium chloride employing sol-gel-based hybrid silanol coatings

    Year: 2021

    Journal: J. Sol-Gel Sci. Technol., Volume 97, MAR, page 556–571

    Authors: Hamidon, Tuan Sherwyn; Ishak, Nur 'Amirah; Hussin, M. Hazwan

    Organizations: Universiti Sains Malaysia (USM Short Term Grant) [304/PKIMIA/6315100]; Universiti Sains Malaysia

    Keywords: Hybrid sol-gel coatings; Span tea leaves; Low carbon steel; Hydrophobic; Impedance; Polarisation

    The anti-corrosion properties of sol-gel-based hybrid silanol coatings incorporated with span tea leaves extract employed on low carbon steel in saline solution was explored by electrochemical and surface analyses. Hybrid sol-gel matrices were prepared by copolymerizing tetraethyl orthosilicate (TEOS) and 3-aminopropyltriethoxysilane (APTES). Corrosion protective hybrid sol-gel coatings were dip-coated on low carbon steel substrates and sintered to ensure the formation of metallo-siloxane bonds. Inhibition efficiency of 85.66% was achieved with the doping concentration of 75 ppm of water extract into hybrid sol-gel at 30 degrees C. Polarisation studies demonstrated that the hybrid coatings incorporated with water extract of span tea leaves operate as a mixed-type inhibitor. The Nyquist impedance plots depicted that on increasing the concentration of span tea leaves extract, charge transfer resistance (R-ct) increased, and double-layer constant phase element (CPEdl) decreased. A comparison of the corrosion resistance of the coated and uncoated low carbon steel substrates was presented. Electrochemical noise analysis substantiated that the optimum corrosion-resistant coating formulation endured a much lower current noise fluctuation. Moreover, wettability analysis established the hydrophobic nature of the optimum corrosion protective coating. [GRAPHICS] .
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