| Aluminum occupy the largest proportion in the total amount of metal elements in the crust, Aluminum alloy has many superior properties to other metals, such as small density, ease of processing, good anti-corrosion performance, high mechanical strength, which endow it with widespread use in aerospace, automobile manufacturing industry and chemical industry, etc. The wettability of Aluminum alloy surface is closely linked to other performances such as anti-icing, drag reduction, anticorrosion and heat conduction performance, thus the wettability research of the aluminum alloy is of great significance to the application of aluminum alloy. In nature, there are many creatures with unique structure and excellent performance, such as lotus leaf, rose petals, butterfly wings and beetle. In recent years, rose petals and lotus leaves have called widely attention for its excellent superhydrophobicity, which is closely related to its surface microstructure. Inspired by the performance of the biological performance in nature, people attach great importance to imitation of biological structures in the modern material preparation to fabricate artificial materials, which is called the bionic functional materials. Biomimetic modification on the metal surface is a new approach to improve the performance of the metal surface.If given superhydrophobicity to metal materials, the corrosion resistance and oxidation resistance of metals are also enhanced, which at the same time expands the application scope of Aluminum alloy in multiple areas. Graphene has unique wetting property, which expands the preparation space of superhydrophobic materials, and many researchers have tried to use the graphene to build biomimetic surface with multi-function. They not only aim to achieve superhydrophobicity of surface, but to implementate to other performance at the same time, such as corrosion resistance, wear resistance, etc. The preparation of graphene, as a new type of bionic nanostructure, provides ideals and expand the space application in the preparation of superhydrophobic materials, but also expands the application range of graphene. If we apply graphene coating on metal substrate, it may both improve the performance of Aluminum alloy and display the superior properties of graphene.In this paper two methods of the preparation of hydrophobic graphene coating Aluminum alloy surface were adopted. One is chemical reduction oxidation graphene, then spinning graphene coating on the preparation of Aluminum alloy substrate, and the result contact Angle is as high as 153.7±2° after measurement. When compared with pure samples, the abrasion resistance on the surface of the graphene coating was increasing. Electrochemical test results showed that the super hydrophobic graphene is of protection coating, which could effectively inhibit corrosion of aluminum alloy.Another method is to use CVD equipment for monolayer graphene depositing on copper foil substrate, then transfer technology combined with PMMA monolayer graphene is transferred to the target Aluminum alloy substrate. Inspired by the surface microstructure of roses, Aluminum alloy surface micromachining by machine on and CVD graphene coating method were adopted successively to construct the biomimetic surface. In order to construct bionic surface with micron grade rough structure on Aluminum alloy surface, the convex hull diameter were 250 ?n and 100?m, respectively, corresponding to the convex hull spacing between 250?m and 100?m respectively.Then, transfer the graphene prepared by CVD method to the Aluminum alloy surface after machining. After Film drying, Aluminum alloy biomimetic surface morphology was observed, the surface wettability, chemical composition, and morphology were characterized. Results showed that the monolayer graphene was successfully transferred to target Aluminum alloy substrate, improving the basal hydrophobic angle. |
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