In-situ constructed core-shell SiO2@f-PPy/MXene hybrid epoxy coating for anticorrosion and antistatic protection of magnesium alloys

The exceptional protection of epoxy resin (EP) is restricted in practical applications due to high electrical insulation and inherent microporous defects. In this study, acid-doped polypyrrole (f-PPy)/MXene hybrid nanomaterials incorporated into the EP matrix to construct three-dimensional (3D) conductive network that simultaneously enhances corrosion resistance and imparts antistatic capability. Electrochemical impedance measurements demonstrate a long-term stability, maintaining 9.73 × 10 10  Ω cm 2 even after 14 days of immersion, which is significantly higher than the EP coatings. Compared with pure EP, the composite SiO 2 @f-PPy/MXene/EP coating shows a 3 times reduction in surface resistivity (8.68 × 10 7  Ω m) and exceeds the industrial antistatic threshold by two orders of magnitude. The enhanced anticorrosion is attributed to the synergistic contribution of the triple properties of the SiO 2 @f-PPy/MXene: “labyrinth effect”, redox effect and corrosion inhibition. SiO 2 @f-PPy/MXene 3D conductive network enhances the antistatic ability of EP. This dual-functional strategy addresses the critical gap of combining anticorrosion and antistatic performance in EP coatings and offers a practical route for protective applications on Mg alloys.