Research Of Bio-inspired Slippery Surface On Marine Corrosion And Biofouling

Exploration and utilization of marine resources are restricted severely by marine corrosion and biofouling.It is of significance to take effectively protective measures against corrosion and biofouling from marine environment.Bio-inspired?nepenthes?slippery surface has excellent properties of repelling any liquid,stain-proofing and anti-icing.Therefore,it has attracted widespread attention.In this thesis,bio-inspired slippery surface was fabricated on Cu-Zn alloy substrate and glass substrate.SEM,3D microscope,and XRD were used to characterize the morphology and composition of matrix for forming slippery surface.The corrosion resistance of slippery surface on Cu-Zn alloy was studied by the electrochemical techniques.The anti-biofouling property of slippery surface on glass was tested in seawater by using fluorescence microscope and UV spectrophotometer.The main conclusions are as follows:A facile approach combining both galvanic dealloying and chemical vapor deposition is proposed to enable the slippery liquid-infused porous surface?SLIPS?onto Cu-Zn alloy.Firstly,Cu-Zn is dealloyed with 4.8 wt%CuSO₄ aqueous solution,and a porous Cu₂O surface is achieved via a dealloying-deposition route.The surface is modified with dodecanethiol to realize the superhydrophobicity.The infusion of oil phase is assisted by the spin coating technique,and SLIPS is finally obtained,showing prominent corrosion inhibition capability with the corrosion current density decreasing to 1/500 of the bare Cu-Zn.Moreover,SLIPS shows high resistance to multiple cycles of electrical field with wide anodic and cathodic window.To external mechanical damage,such as cutting and erosion in seawater,SLIPS behaves good self-healing capability.Even after cutting or drilling the surface for many times,the corrosion inhibition can still be maintained,indicating that the coating constructed by self-healing fluid has high tolerance to external mechanical damage.Moreover,taking transparent glass as the substrate,robust SiO₂ having three-dimensional interconnecting net configuration grows onto the surface via a facile breath figure approach under mild condition.The grafting of long-chain organic molecule achieves a hydrophobic surface,which acts as the reservoir for accommodating the lubricant to form the liquid-infused surface.Taking diatom as the representative organism,the surface can effectively inhibit biofouling growth.Even immersed in seawater for 11 days,the inhibition efficiency can still maintain 96.1%.The light transmittance of the SLIPS is still higher than that of bare glass,which proves that the SLIPS can effectively inhibit the attachment of biofouling.