Abstract: A method for making housing, comprising: providing a substrate; etching the substrate to form a plurality of grooves on a surface of the substrate; micro-arc oxidizing the substrate to form a micro-arc oxide film in the grooves and on the surface of the substrate; and polishing the micro-arc oxide film formed on the surface of the substrate. A housing, comprising: a substrate, the substrate having a plurality of grooves defined therein; and a micro-arc oxide film formed on the surface of the substrate and in the grooves; wherein the oxide film formed on the surface of the substrate is polished to present a glossy appearance.

Abstract: A housing, comprising: a substrate; a micro-arc oxide film formed on the substrate; and a plurality of grooves formed on the oxide film; wherein all or part of the oxide film is polished to present a glossy appearance, the grooves are formed on the polished region of the oxide film. A method for making housing, comprising: providing a substrate; micro-arc oxidizing the substrate to form a micro-arc oxide film on the substrate; polishing at least part of the micro-arc oxide film; and etching the polished surface of the micro-arc oxide film to form grooves in the polished surface.

Abstract: An aluminum alloy article includes an aluminum alloy substrate and a micro-arc oxide film formed on the aluminum alloy substrate. The micro-arc oxide film includes a transition layer gradually infiltrating into the aluminum alloy substrate, a middle dense layer formed on the transition layer, and an outer dense layer formed on the middle dense layer, the outer dense layer having a density larger than that of the middle dense layer.