LAUSR

Sustainability, eco-efficiency, and green chemistry are guiding the development of new materials in various fields. Herein, we designed and fabricated the bio-based superhydrophobic coatings by means of a facilely spraying-synthesized method. The as-prepared superhydrophobic coatings exhibited the great water-repellency with higher water contact angle being up to 156.9±2.7° and 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 with the effective corrosion and pollution protection ability. The electrochemical measurements testified the great corrosion resistance with higher corrosion voltage of -204.7 mV, lower corrosion current of 1.494×10-5 A/cm2. The corrosion protection efficiency reached the value of 95.2%, and meantime the superhydrophobic coatings displayed higher anti-pollution performance without any stains when they were pulled from the pollutional liquids. On this basis, the underlying physical-chemical mechanisms were clearly revealed that the surface micro-nanostructures could capture the continuous and stable air layer to segregate the corrosion and pollution mediums.