科研之友
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摘要
In this paper, a novel multifunctional superamphiphobic coating for anticorrosion was successfully prepared on aluminum substrate via a simple spraying technique. Al2O3 nanoparticles were chemically grafted ontomontmorillonite (MMT) nanosheets via coupling effect of NH2-C3H6-Si( OC2H5)(3) (KH-550) and then modified by low surface energy material polydimethylsiloxane (PDMS). The ethylene tetrafluoroethylene (ETFE) composite coating with 25 wt% MMT/Al2O3-PDMS binary nanocomposite exhibited well-designed nano/mu structures and possessed superamphiphobicity with high contact angles towards water (164 degrees), glycerol (158 degrees) and ethylene glycol (155 degrees). This coating demonstrated outstanding self-cleaning ability and strong adhesive ability (Grade 1 according to the GB/T 9286). The superhydrophobicity could be maintained after 8000 times abrasion or annealing treatment for 2 h under 350 degrees C. The coating still retained high water-repellence after immersion in 1 mol/L HCl (146 degrees), 1 mol/L NaOH (144 degrees) and 3.5 wt% NaCl (151 degrees) solutions for 30 d. It should be noted that this superamphiphobic coating revealed excellent long-term corrosion protection with extremely low corrosion rate (4.3 x 10(-3) mu m/year) and high protection performance (99.999%) after 30 d immersion in 3.5 wt% NaCl solutions based on electrochemical corrosion measurements. It is believed that such integrated functional coating could pave new way for self-cleaning and anticorrosion applications under corrosive/abrasive environment.
- 出版日期2017-3-23
- 单位东北石油大学
