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(a) Water droplets on the amorphous coating exhibiting a hydrophobic feature; (b) the macroscopic surface image of the hydrophobic amorphous coating (with a surface area of 40 × 15 mm2) showing no detected pits after 30-days salt-fog test.
The surface morphology and measured roughness of the three typical as-sprayed amorphous coatings; (a) coating 1; (b) coating 2, and (c) coating 4. See Table I for the spraying parameters for making different coatings.
(a) The relationship between the roughness and CA of the coatings before and after modification; (b), (c) the superhydrophobic surface of modified coating 2 with a water contact angle of 160° and a sliding angle of around 9°; (d), (e) demonstration of self-cleaning ability of the superhydrophobic coatings, the dirty (some amorphous powders) was taken away automatically by a rolling water droplet.
Schematic diagram of a water droplet on (a) a hydrophilic coating according to the Wenzel model and (b) a hydrophobic coating according to the Cassie-Baxter model.
Detailed spraying parameters used during HVOF process.
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