Benzotriazole@ZIF‐8 Enhances the Corrosion Resistance and Conductivity of Carbon Nanotube/Epoxy Composite Coatings for Grounding Grid

A ZB/CNTs/E606 conductive anti‐corrosion composite coating was prepared on Q235 steel via a physical blending process. The coating consists of E606 epoxy resin as the matrix, carbon nanotubes (CNTs) as the conductive filler, and a metal‐organic framework ZIF‐8 encapsulating the corrosion inhibitor benzotriazole (BTA) as a functional modifier (denoted as ZB). The coating with 0.5 wt.% ZB retains low resistivity (∼10 −2 Ω·m) after 30‐day saline immersion/salt‐spray exposure, exhibits high low‐frequency (|Z| 0.01Hz ) impedance (3.3 × 10 5 Ω·cm 2 ), and shows no corrosion after 40‐day salt‐spray testing. Adhesion remains above 10 MPa in all tested conditions. The coating combines sustained conductivity, strong adhesion and active corrosion inhibition, offering a durable solution for grounding systems in aggressive environments.