A fly ash-derived polybenzoxazine/zeolite A bilayer coating with excellent superhydrophobicity and corrosion resistance
writer：Meichen Wang, Weiwei Wang, Shuiquan Li, Haolang Liu, Xiaotian Fan, Zhi Wang
keywords：Superhydrophobic ,Adhesion, Anti-corrosion, Benzoxazine, Zeolite
source：期刊
specific source：Progress in Organic Coatings
Issue time：2022年
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 this study, a doublelayer 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. 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. In particular, the impedance value of our designed coating is 2.677 × 108 Ω, which is 4 orders of magnitude greater than the pure benzoxazine coating. The benzoxazine/zeolite A (from fly ash) bilayer coatings developed mechanical properties, anti-fouling and corrosion resistance, which not only boosted the use of fly ash but also created a new type of anti-corrosion coating.