Method of forming multicolor aluminum alloy

Abstract

A method for forming multicolor aluminum alloy has steps of preparing, surface treating, forming, processing and reprocessing. Preparing comprises providing an aluminum alloy substrate and cleaning with water. Surface treating has disposing the substrate in a base electrolytic solution to form a base oxide layer by anodizing. Forming has forming a membrane of transparent, acid-proof, insulated plastic on the substrate. Processing has removing local area membrane and corresponding oxide layer from the substrate and cleaning. Reprocessing has disposing the clean substrate in a subsequent electrolytic solution to form a subsequent oxide layer on areas of the substrate exposed by the membrane by anodizing.

1 . A method of forming multicolor aluminum alloy comprising steps of:
 preparing, comprising
 providing an aluminum alloy substrate having an external surface; 
 machining the substrate with coolant and oil to form a shaped substrate; 
 removing the coolant and oil from the external surface of the substrate; and 
 cleaning the shaped substrate with water; 
   surface treating, comprising disposing the shaped substrate with clean external surface in a base electrolytic solution to form a base oxide layer on the external surface of the substrate by an anodizing surface treatment to provide a colored substrate:   forming, comprising forming a membrane on the colored substrate by a transparent, acid-proof, insulating plastic;   processing, comprising
 processing the colored substrate to remove at least one local area of membrane and corresponding local area of colored oxide layer from the external surface of the colored substrate; 
 removing the coolant and oil from the colored substrate; and 
 cleaning the external surface of the colored substrate with water to form a clean colored substrate; and 
   reprocessing, comprising disposing the clean colored substrate in a subsequent electrolytic solution to from a subsequent oxide layer on the external surface of the substrate exposed by the membrane.   
     
     
         2 . The method as claimed in  claim 1 , wherein the step of surface treating further comprises removing the substrate from the base electrolytic solution after forming the base oxide layer on the external surface of substrate and drying. 
     
     
         3 . The method as claimed in  claim 2 , wherein the reprocessing step further comprises removing the substrate from the subsequent electrolytic solution after forming the subsequent oxide layer on the external surface of the substrate and drying. 
     
     
         4 . The method as claimed in  claim 3 , wherein the step of machining the substrate is performed by a Computer Numerical Control (CNC) machine. 
     
     
         5 . The method as claimed in  claim 4 , wherein the step of processing the substrate to remove at least one local area membrane and corresponding local area of colored oxide layer from the external surface of the colored substrate is performed by the CNC machine. 
     
     
         6 . The method as claimed in  claim 5 , wherein in the steps of removing the coolant and oil uses sodium hydroxide. 
     
     
         7 . The method as claimed in  claim 1 , wherein the steps of surface treating and surface reprocessing further comprise removing the substrate from the electrolytic solution after forming the oxide layer and drying. 
     
     
         8 . The method as claimed in  claim 1 , wherein in the step of machining the substrate to form the shaped substrate is performed by a CNC machine. 
     
     
         9 . The method as claimed in  claim 1 , wherein the step of processing the substrate to remove at least one local area membrane and corresponding local area of colored oxide layer from the external surface of the colored substrate is performed by a CNC machine. 
     
     
         10 . The method as claimed in  claim 1 , wherein the steps of removing the coolant and oil form the external surface of the substrate uses sodium hydroxide.