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Spraying Preparation of Eco-Friendly Superhydrophobic Coatings with Ultralow Water Adhesion for Effective Anticorrosion and Antipollution
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posted on 2020-05-25, 04:43 authored by Yizhou Shen, Zhengwei Wu, Jie Tao, Zhenfeng Jia, Haifeng Chen, Senyun Liu, Jiawei Jiang, Zhen WangSustainability,
eco-efficiency, and green chemistry guide the development of new materials
in various fields. Herein, we designed and fabricated bio-based superhydrophobic
coatings by means of a facile spraying synthesized method. The as-prepared
superhydrophobic coatings exhibited high water repellency with higher
water contact angle being up to 156.9 ± 2.7° and a lower
sliding angle of only 4.3 ± 0.6°. Also, the water adhesion
on the superhydrophobic coatings was as low as 11 μN, which
was far less than that (346 μN) of the normal polyurethane surfaces.
The superhydrophobic properties still retained high stability under
the conditions of soaking in acid solution (pH = 1) and alkaline solution
(pH = 13). Meanwhile, the as-prepared bio-based superhydrophobic coatings
were verified for effective corrosion and pollution protection ability.
The electrochemical measurements showed excellent corrosion resistance
with a higher corrosion voltage of −204.7 mV and lower corrosion
current of 1.494 × 10–5 A/cm2. The
corrosion protection efficiency reached a value of 95.2%, and meantime,
the superhydrophobic coatings displayed higher antipollution performance
without any stains when they were removed from the polluted liquids.
On this basis, the underlying physical–chemical mechanisms
clearly revealed that the surface micro-nanostructures could capture
the continuous and stable air layer to segregate the corrosion and
pollution media.