Development of a Robust Self-Healing Anticorrosion Coating via One-Pot Electrochemically Deposited SiO۲/Linseed on Carbon Steel Electrode

This work presents a novel self-healing/anti-corrosion coating based on epoxy resin decorated with electrochemically deposited silicon dioxide (SiO۲)/linseed oil (LO). For this purpose, the SiO۲/LO composite was prepared via a one-pot electrochemical deposition method, which was then utilized as a precursor for epoxy coating preparation. Various techniques, including Fourier Transform InfraRed (FT-IR) spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDS), ThermoGravimetric Analysis (TGA), and X-Ray Diffraction (XRD) analysis were used to characterize the coated steel samples. Corrosion current and corrosion potential were decreased following the addition of SiO۲ and LO to the steel surface. The mechanism of improved anticorrosion performance of the composite coating can be attributed to the synergistic effect of the components within the composite film. The effect of various coatings on the anticorrosive characteristics of the self-healing coatings has been investigated by electrochemical impedance spectroscopy (EIS), Tafel plots, salt spray, and optical images. The defected self-healing coating consisting of epoxy/SiO۲/LO exhibited exceptional healing ability and corrosion inhibition performance toward steel metal as evidenced by EIS and optical images. The SiO۲/LO coating layer shows the lowest corrosion current of ۰.۰۹۱ µA/cm۲ compared to SiO۲ with ۰.۸۲۲ µA/cm۲ in corrosive saline media. Furthermore, epoxy-coated SiO۲/linseed oil and epoxy-coated SiO۲ films on steel supports exhibit corrosion resistances of ۱.۹۵×۱۰۸ and ۷.۲۰×۱۰۷ Ω/cm۲ demonstrating better performance of silica-containing linseed oil. It seems that the addition of a hydrophobic linseed oil component can successfully delay the diffusion of water molecules or electrolyte ions, resulting in the improvement of anticorrosion characteristics of the coating layer.

کلیدواژه ها:

Self-healing ، Electrochemical deposition ، silicon dioxide ، Linseed oil ، Corrosion Protection