Patent ID: 8968548
Filing Date: 2015-03-03
Classification: C25D,H04M

Abstract:
1. A method of forming a multicolor surface, comprising the steps of: providing an aluminum-based substrate having an outer surface and an inner surface; performing a mechanical process on the substrate; forming at least one fixing portion on the inner surface of the substrate; drilling the fixing portion to form at least one hole thereon; performing a first anodic treatment to form a first oxide layer with a first color on the outer surface of the substrate, wherein an anodic electrode is fastened to the hole of the fixing portion to make electrical connection between the fixing portion and the anodic electrode; drilling the fixing portion to remove the first oxide layer from an inner edge of the hole thereof, wherein the hole is expanded through drilling; removing a portion of the first oxide layer to partially expose the outer surface of the substrate; performing a second anodic treatment to form a second oxide layer with a second color on the exposed outer surface of the substrate by connecting the anodic electrodes to the expanded hole, wherein the second color is different from the first color; and removing the fixing portion.