Patent ID: 9051658
Filing Date: 2015-06-09
Classification: C25D

Abstract:
1. A method for forming a protective film on a metal part, comprising: converting a first portion of the metal part to a barrier layer, the barrier layer having a top surface corresponding to a top surface of the metal part, wherein the barrier layer has substantially no pores; forming a plurality of branched structures within at least a top portion of the barrier layer, the plurality of branched structures arranged in a branching pattern only within the barrier layer, wherein the plurality of branched structures provide a light scattering medium that diffusely reflects nearly all visible wavelengths of light incident on the top surface and imparting a white appearance to the barrier layer; and converting a second portion of the metal part, below the barrier layer, to a porous anodic layer, the porous anodic layer providing structural support for the barrier layer.