<p>The corrosion protection behaviour of polyvinylcarbazole (PVK)/SiO₂ hybrid composite coating on 316L stainless steel (SS) in marine environment was evaluated in the present work. In this current study, 316L SS has been used as a base metal and elctropolymerization of PVK/SiO₂ nanocomposite has been carried out at 1.2 V_SCE over a period of 1000&#xa0;s. This method of coating was used to coat hybrid nanocomposite materials (HNC) of PVK mixed with different amounts (0–3) wt% of nano-SiO₂ materials. Surface morphological outcomes revealed aggregate particles embedded hybrid coatings and integrate wt% of incorporated SiO₂ nanoparticles. Corrosion tests of uncoated and coated 316L SS samples were used to determine the corrosion properties of the hybrid nanocomposite coating in a 3.5% NaCl solution, which could be applicable to structural use in the naval sector. Based on the results obtained, 2 wt% SiO₂ incorporated hybrid nanocomposite coating showed low values of corrosion current density, and high values of Bode-impedance than the PVK and other amounts of SiO₂. The inclusion of silica nanoparticles notably improved the coating’s mechanical strength to the steel substrate. The values of the contact angle of the nanocomposite coating containing 2 wt% SiO₂ were larger than those of the other SiO₂ and PVK concentrations. Thermal studies results showed the improved thermal stability of PVK/SiO₂ nanocomposite material. Its enhanced performance PVK/SiO₂ is due to a combination of excellent electrochemical corrosion resistance, improved mechanical properties and a hydrophobic surface nature<b>.</b></p>