Study on the Construction and Anti-Corrosion Properties of Mechanically and Chemically Stable Superhydrophobic Coatings
The superhydrophobic coating can effectively prevent the intrusion,adhesion and condensation of water-containing corrosive media on the surface. However,the poor mechanical and chemical stability of traditional superhydrophobic coatings significantly limits their applica-tion in complex and harsh environments. In this study,a superhydrophobic PDMS-EP@SiO2-GO coating was formed on the surface of Q345 steel sheets by using a composite substrate of graphene oxide (GO) and nano silicon dioxide (SiO2) with polydimethylsiloxane (PDMS) and epoxy resin (EP),combined with spraying technology. The superhydrophobic,self-cleaning,anti-fouling,mechanical wear resistance,chem-ical corrosion resistance and anti-corrosion properties of the coating were studied. Results showed that the water contact angle of PDMS-EP@SiO2-GO was 166.57°,and the sliding angle was less than 3°. Due to the strengthening effect of GO on the coating substrate,the coating main-tained a contact angle of more than 155° for liquids with water temperatures ranging from 20℃ to 100℃ and a contact angle of more than 160° for acidic/alkaline solutions. The sliding angle was less than 4° under the above conditions. After sandpaper friction (total friction length of 40 m) and 30 cycles of tape-peeling tests,the coating still exhibited good superhydrophobic ability,with the contact angle remaining above 152°. In addition,PDMS-EP@SiO2-GO,with excellent water resistance,demonstrated good anti-fouling and self-cleaning properties. In terms of corrosion protection,the lowest frequency impedance of PDMS-EP@SiO2-GO increased by an order of magnitude,and the charge transfer re-sistance increased by two orders of magnitude,showing excellent corrosion resistance. PDMS-EP@SiO2-GO addressed the problem of weak mechanical and chemical stability in traditional superhydrophobic coatings and enabled the persistent protection of the metal substrate. The as-prepared superhydrophobic coating,with good practicability,contributes to the safe and reliable service of mechanical equipment throughout its life cycle.
superhydrophobic coatingnano silicon dioxidemechanical stabilitychemical stabilityanti-corrosion and wear resistance
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维普
