DEVICE HOUSING AND METHOD FOR MAKING THE SAME

摘要

A device housing is described. The device housing includes an aluminum alloy substrate and a compound corrosion resistant layer formed on the substrate. The compound corrosion resistant layer includes two crystalline films and a non-crystalline film formed between the crystalline films. One of the crystalline films is formed on the substrate. The crystalline film is a chromium-oxygen-nitrogen film or an aluminum-oxygen-nitrogen film. The non-crystalline film is an aluminum oxide film or a silicon dioxide film. A method for making the device housing is also described.