Abstract
A bio-based benzoxazine, synthesized from cardanol, stearylamine and paraformaldehyde, was utilized to develop a superhydrophobic polybenzoxazine double-layer coating with active protection for carbon steel. This double-layered coating consists of an active anti-corrosive primer and a superhydrophobic topcoat. Halloysite nanocontainers with 2-mercaptobenzimidazole were embedded in the primer to achieve active corrosion resistance. The superhydrophobic topcoat constructed of low-surface-energy polybenzoxazine and amine-modified silica nanoparticles can acquire reinforced passive anticorrosive barrier. The durable double-layer coating could still maintain its superhydrophobicity, even after 60 days of treatment at −20 °C or 100 °C, or 100 cycles of sandpaper abrasion. More importantly, the electrochemical measurement results indicated that the polybenzoxazine superhydrophobic coating maintained outstanding anti-corrosion performance during 90 days immersion in NaCl solution.
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