Corrosion-resistant research of a high-performance urushiol-based coating based on multi-walled carbon nanotubes

Abstract

Long drying times and poor corrosion resistance of urushiol-based coatings remain major roadblocks to large-scale and real-world application. In order to solve the above problems, a composite urushiol-based coating with short drying time, excellent corrosion resistance and mechanical properties was prepared by modifying the coatings with Fe³⁺ ions, methyl cellulose (MC) and multi-walled carbon nanotubes (MWCNTs). Among these materials, as added the amino-modified multi-walled carbon nanotubes (MWCNTs-NH₂) exhibited the most efficacious modification effect (content was 0.3 wt.%). The corrosion potential, corrosion current and impedance of the best composite coating were − 506.68 mV, 1.77 × 10^-10 A cm^-2 and 3.91 × 10⁷ kΩ cm^-2, respectively. In addition, the formation of Fe-O bonds, C-N bonds, and van der Waals forces enables the composite coatings to have the greatest physical and mechanical properties and thermal stability. Concurrently, the drying time, pencil hardness and impact resistance were 20 min, 4 H and 55 cm, respectively. This study provides a new reference and technical basis for future research on corrosion-resistant nature coatings.