CPC C21D 10/005 (2013.01) [C22C 21/00 (2013.01)] | 6 Claims |
1. A pulse current-assisted laser peen forming and hydrophobic surface preparing method for an aluminum alloy, comprising the following steps:
pretreating a surface of an aeronautical aluminum alloy;
placing a pretreated aluminum alloy onto a shock platform, wherein electrodes are respectively provided at two ends of the aluminum alloy, to locate a surface of the aluminum alloy and apply a high-frequency pulse current to the surface of the aluminum alloy; the surface of the aluminum alloy material serves as an absorbing layer, and flowing silicone oil covering the surface of the aluminum alloy serves as a confining layer, wherein the surface of the aluminum alloy is covered by the silicone oil at 30° C. to 100° C.;
determining a laser energy E according to material attributes of the aluminum alloy, and an acoustic impedance of each of the absorbing layer and the confining layer;
applying the high-frequency pulse current to the surface of the aluminum alloy through the electrodes to perform electrical pulse treatment on the aluminum alloy, wherein a shot peening laser generates a laser beam according to the laser energy E to shock the surface of the aluminum alloy; under an action of an electrical pulse and laser shock, the aluminum alloy shows a bent arc-shaped surface, with a shock surface forming a porous micro multi-stage surface; and under the action of the electrical pulse and the laser shock, a middle of the aluminum alloy is protruded toward a laser shocking direction to form a deformed part with an arc-shaped cross section, two ends of the cross section being positions for locating the surface of the aluminum alloy; and
performing chemical modification on the shock surface of the aluminum alloy to reduce a surface energy of the material, thereby obtaining a super-hydrophobic arc-shaped aluminum alloy surface.
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