Influence Of Anodic Aluminum Oxide Superhydrophobic/slippery Surface On Marine Environmental Corrosion

Corrosion is a serious challenge we have to face to while live with ocean, it cause a great economic loss and even safty problems. Recently, biomimetic surface are arousing serious concern in the field in question. Accordingly, bionic superhydrophobic surface possess application potentials in the field in question, and another bionic surface, slippery liquid infused porous surfaces(SLIPS) have been proven to inhibid adhesion of microorganisms. In this work, we focus on the protectiveness of anodic aluminium oxide super-hydrophobic surface and SLIPS to marine atmospheric corrosion and marine microorganism influence corrosion. Conclutions are as follows:(1) A simple anodisation method combined with fluorination treatment was developed to fabricate a superhydrophobic layer on aluminium surface. Surface morphology and component were characterised with FE-SEM and XPS, respectively. Grown scheming of anodic alumina film was established by breaking the anodization reaction, and the relationship between surface morphology and wettability was analysed. Furthermore, mechanical stability was evaluated with Scotch tape test and Scratch test(2) The slipping behaviour of deliquesced NaCl particle on the tilted superhydrophobic layer prevent its further influence due to deliquescence, and the corrosion resistance of the super-hydrophobic layer to the substrate was tested with electrochemical measurement. The insulating aluminium oxide layer serve as a barrier to corrosion, and the existent of air film trapped in the microstructure of surface isolate the metal from corrosive medium, which promote the protection performance of the asfabriction surface.(3) SLIPS were fabricated on superhydrophobic alumina substrate by infiltration with lubricant. SRB and green alga can’t adhere on the SLIPS in both static and flowing condition. Corrosion resistance of SLIPS in the medium of SRB was also evaluated by electrochemical measurement. Which demonstrated that SLIPS present high resistance to microbiological corrosion. Such protectiveness own to the insulating aluminium oxide layer and the lubricant trap in the solid surface.