Patent ID: 9187841
Filing Date: 2015-11-17
Classification: C25D,H05K

Abstract:
1. A method of forming a skid-proof leather-texture surface on a metallic substrate, comprising the following steps of: providing a metallic substrate, roughening the surface of the metallic substrate by performing sand-blasting, wherein the roughness of the surface of the metallic substrate exhibiting a Ra value smaller than 1.1 μm and a RPC value between 100˜200/cm; cleaning the surface of the metallic substrate; etching the surface of the metallic substrate by an etchant at an etching temperature of 40±5 degrees Celsius in an etching time between 1 to 15 minutes while using an etch-moderating agent to moderate the condition of etching, wherein the etchant comprises a final volume percentage of 50%-75% of ammonium bifluoride, 10%-20% of ammonium sulfate, 5˜8% of mono-ammonium phosphate, 1%-3% of triammonium phosphate, 1%-2% of ammonium oxalate, 0.32% iron chloride and 0.06% copper sulfate, wherein the etch-moderating agent comprises 50 PPM of sodium dodecylbenzenesulfonate; chemical polishing the etched surface of the metallic substrate, wherein the gloss of the chemical polished surface is smaller than 6; anodically treating the chemical polished surface of the metallic substrate to form an oxidized film having micro-porous structure thereon; activating the micro-porous structure of the oxidized film; dyeing the activated micro-porous structure of the oxidized film; sealing the dyed micro-porous structure of the oxidized film; and removing ash from the metallic substrate and the dyed micro-porous structure.