Multicolor anodizing treatment

Abstract

A multicolor anodizing treatment for treating the surface of an aluminum workpiece includes the steps of (1) anti-oil procedure where dirty oil is removed from the aluminum workpiece, (2) rinsing where the aluminum workpiece is cleaned with running water in a rinsing trough, (3) chemical polishing where the aluminum workpiece is polished by means of a chemical solution, (4) anodizing where the aluminum workpiece is anodized to produce an oxide surface layer, (5) coloring where the aluminum workpiece is colored with at least one color, (6) drying where the aluminum workpiece is dried, and (7) finishing where the aluminum workpiece is sealed with a layer of sealant.

1 . A multicolor anodizing treatment for treating the surface of an aluminum workpiece, comprising the steps of:
 (1) anti-oil procedure where dirty oil is removed from the aluminum workpiece;   (2) rinsing where the aluminum workpiece is cleaned with running water in a rinsing trough;   (3) chemical polishing where the aluminum workpiece is polished by means of a chemical solution;   (4) anodizing where the aluminum workpiece is anodized to produce an oxide surface layer;   (5) coloring where the aluminum workpiece is colored with at least one color;   (6) drying where the aluminum workpiece is dried; and   (7) finishing where the aluminum workpiece is sealed with a layer of sealant.   
   
   
       2 . The multicolor anodizing treatment as claimed in  claim 1 , wherein said chemical polishing is performed by means of applying one of the solutions of phosphoric acid solution, nitric acid solution and strong alkali solution to the aluminum workpiece to remove impurities from the surface of the aluminum workpiece so that the aluminum workpiece shows the original aluminum color. 
   
   
       3 . The multicolor anodizing treatment as claimed in  claim 1 , wherein the aluminum workpiece is anodized during the anodizing step to produce an oxide surface layer that has a porous structure for the adhering of a color agent; 
   
   
       4 . The multicolor anodizing treatment as claimed in  claim 1 , wherein coloring the aluminum workpiece with at least one hydrophilic color agent by means of printing performs the coloring step. 
   
   
       5 . The multicolor anodizing treatment as claimed in  claim 1 , wherein coloring the aluminum workpiece with at least one hydrophilic color agent by means of spray coating performs the coloring step. 
   
   
       6 . The multicolor anodizing treatment as claimed in  claim 1 , wherein coloring the aluminum workpiece with at least one hydrophilic color agent by means of painting performs the coloring step. 
   
   
       7 . The multicolor anodizing treatment as claimed in  claim 1 , wherein hanging the aluminum workpiece on a tool and dipping the aluminum workpiece in a heated chemical trough containing one of the solutions of nitric acid solution, sulphoacid solution and sodium hydroxide solution perform the anti-oil step 
   
   
       8 . The multicolor anodizing treatment as claimed in  claim 1 , wherein cleaning the aluminum workpiece with running water in a rinsing trough performs the rinsing step. 
   
   
       9 . The multicolor anodizing treatment as claimed in  claim 1 , wherein the anodizing step is performed by hanging said the aluminum workpiece on a tool and dipping the aluminum workpiece in an anodizing trough to receive a sulphoacid anodizing process, for enabling the aluminum workpiece to be coated with a layer of sulphacid anodic oxide coating. 
   
   
       10 . The multicolor anodizing treatment as claimed in  claim 1 , wherein the drying is performed by drying the aluminum workpiece in a baking oven at 30°-120° C. 
   
   
       11 . The multicolor anodizing treatment as claimed in  claim 1 , wherein the finishing step is performed by hanging said the aluminum workpiece on a tool and dipping the aluminum workpiece in a chemical sealant trough to have the aluminum workpiece to be sealed with a layer of sealant.