Superhydrophobic coating with excellent corrosion resistance

Researchers have presented a fly ash-derived polybenzoxazine/zeolite A bilayer coating with excellent superhydrophobicity and corrosion resistance.

A padlock in front of a coated wooden door.
The bilayer coatings showed good anti-fouling and corrosion resistance.  Image source: ShonEjai - Pixabay - Pixabay (symbol image).

Organic resin-based coating is the most effective and cost-efficient method for preventing metal corrosion, but it is always plagued by its hydrophilicity, brittleness and preparation-induced pore flaws. In a new study, a double-layer superhydrophobic anti-corrosion coating  with concentration gradient variation was designed and prepared, using benzoxazine as the matrix and waste fly ash-prepared zeolite A as the inorganic filler.

Improved adhesion

The upper layer of the designed coating with the low concentration of zeolite formed a superhydrophobic surface with a water contact angle of 158.8° ± 0.9°, while the high concentration of zeolite in the lower layer improved the adhesion of the coating to the metal substrate with a surface hardness of 5H and an adhesion of 5B, which were both significantly improved in comparison to the pure benzoxazine coating.

The study has been published in Progress in Organic Coatings, Volume 171, October 2022.

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