Hydrogen bubble-templated electrodeposition of modifier-free superhydrophobic Zn-Ni films

When the water droplets contact an unclean superhydrophobic surface, they roll on the surface to take away the dust. Herein, self-cleaning superhydrophobic Zn-Ni films were fabricated using a dynamic hydrogen bubble as template. The influence of bath temperature on the surface topography, phase structures, and wettability were investigated. It turned out that in the process of the Zn-Ni films deposition, zinc was formed preferentially than nickel because Zn+ads promoted the reduction of zinc ions, which belonged to anomalous co-deposition. With the rising of the plating solution temperature, the bubble coverage on the films increased, and the water contact angles of the films increased first and then reduced. When the bath temperature was up to 40 °C, SEM observations revealed an even distribution of micropores among the surface and a rough, cauliflower-like clusters surface morphology, which is promising for superhydrophobicity. The modifier-free superhydrophobic Zn-Ni films with a contact angle for water up to 152 ± 0.9 ° were achieved. The as-prepared superhydrophobic Zn-Ni films possessed the plastron effect, stability against water jet impact, excellent self-cleaning property, and anti-corrosion performance. It's believed that the superhydrophobic films can expand the application scope of magnesium alloys.

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