Abstract
Abstract In this paper, environmentally friendly layered double hydroxide nanoparticles/silane hybrid nanocomposite coatings were fabricated on mild steel substrate. Zinc–aluminum layered double hydroxides (Zn–Al LDHs) pillared with different anions (nitrate, molybedate and phosphate) were synthesized and characterized by X-ray diffraction (XRD). Various LDHs was employed in a hybrid silane coating based on mixture of tetraethyl ortosilicate (TEOS) and aminopropyl triethoxy silane (APTES). The silane coatings including LDHs were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and contact angle measurement. Then, the corrosion characterization of the coatings was investigated by electrochemical impedance spectroscopy (EIS), polarization and electrochemical noise (EN) techniques. Addition of LDHs to the sol–gel film increased its barrier properties due to their planar structure. The results revealed that the silane coating in the presence of phosphate could provide superior electrochemical corrosion protection compared to the sol–gel film which is solely incorporated with molybedate and nitrate.
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