Abstract: he micro-groove array was fabricated by micro-milling technology and WEDM. The width of convex platform was changed to obtain the first order structure with different rough factors. A secondary structure with different rough factors was obtained by processing micro-groove surface with different pulse width parameters. The surface hydrophobic properties of different rough factors were observed and the hydrophobic mechanism was analyzed. The results show that, on the surface of the aluminum alloy with an intrinsic contact angle of 50°, the single-scale microstructure constructed by micro-milling technology realizes the transition from hydrophilic to hydrophobic on the surface of the aluminum alloy, and the multi-scale structure of micro-milling-EDM processing achieves the superhydrophobic performance of the aluminum alloy surface. When the secondary structure is certain, the contact angle of the aluminum alloy surface machined by composite machining decreases linearly with the increase of the roughness factor of the first order structure. When the first order structure is certain, the contact angle of the aluminum alloy surface after the composite processing increases firstly and then decreases with the increase of the surface roughness. The contact state of primary structure is a transitional state between Cassie model and Wenzel model, the contact state of the micron crater is Wenzel state, and the contact state of the nano scale structure is Cassie-Baxter state.
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2019, Vol. 33 
