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Orthogonal experiment on super-hydrophobic aluminum surface by high-speed wire electrical discharge machining

In this paper, we present a new process that double discharge machining was adopted to fabricate super-hydrophobic surface on aluminium substrate by HS-WEDM (high speed wire cut electrical discharge machining). We optimized the double processing parameters by the orthogonal experiment, and discussed the wetting mechanism on the surface of the specimen. The experiment shows that, when the first and second pulse width all are 6 μs, the feed rate is 62 μm/s and 44 μm/s respectively, the surface of aluminium alloy has the best hydrophobic property. Using the optimal parameters for processing, the static contact angle can reach 156.24°. After observing the surface, it is can be known that specimen surface captures massive amounts of air due to the distribution of crater-convex micro structure and the like. This structure can form the `air cushion' increasing the contact area between water droplets and air.