Laser scanning selective coloring method on surfaces of aluminum alloy

The invention provides a laser scanning selective coloring method on surfaces of aluminum alloy. The method includes: (1), vectoring and filling laser scanning coloring images; (2), degreasing, deoiling and cleaning the surfaces of to-be-colored workpieces; (3), placing the cleaned to-be-colored workpieces in pre-prepared coloring solution; (4), using a laser to output pulse laser beams which are focused on the surfaces of the to-be-colored workpieces for laser path scanning; cleaning the to-be-colored workpieces after scanning to obtain the aluminum alloy workpieces with laser scanning coloring images. The method has the advantages that the pulse laser is used to stimulate the explosion action of high-temperature bubbles, coloring of oxidized or non-oxidized surfaces is achieved, procedures such as polishing and oxidization required by traditional coloring processes are omitted, the method is material saving, low in cost, and low in coloring solution consumption, the coloring solution can be filtered for recycling and can be firmly combined with the surfaces of the workpieces, easy fading can be avoided, and good durability can be achieved.