When the aluminum is used outdoors, a protective film is formed on the surface of the aluminum after the anode, so that it is not easy to oxidize and erode, which can extend the life and ensure the appearance! Also used in electronics, such as hard disk enclosures, radiators, etc., the anodized aluminum surface is not conductive, which is also a role in circuit protection. In addition, some aluminum products can be oxidized into a variety of colors, fonts, etc., to make more high-grade gift packaging boxes