Aluminum alloy housing and preparation method thereof

Abstract

This disclosure provides an aluminum alloy housing and a preparation method for same. An external surface of the aluminum alloy housing has a convex portion and a concave portion, the convex portion has a convex oxide film and a convex electrophoretic decorative layer in turn, the concave portion has a concave oxide film or a concave electrophoretic decorative layer, surface of the convex electrophoretic decorative layer has a glossiness of 90-105, and surface of the concave oxide film has a glossiness of 5-25 or surface of the concave electrophoretic decorative layer has a glossiness of 0.5-5.

What is claimed is: 
     
         1 . An aluminum alloy housing, comprising an external surface having a convex portion and a concave portion, wherein:
 the convex portion includes a convex oxide film and a convex electrophoretic decorative layer, wherein a surface of the convex electrophoretic decorative layer has a glossiness of 90-105; and   the concave portion includes a concave oxide film or a concave electrophoretic decorative layer, wherein a surface of the concave oxide film has a glossiness of 5-25, and a surface of the concave electrophoretic decorative layer has a glossiness of 0.5-5.   
     
     
         2 . The aluminum alloy housing according to  claim 1 , wherein a height difference between the convex portion and the concave portion is 0.05-0.2 mm. 
     
     
         3 . The aluminum alloy housing according to  claim 1 , wherein the convex oxide film and the concave oxide film have different colors. 
     
     
         4 . A preparation method for an aluminum alloy housing, comprising steps of:
 step a: performing first anodic oxidation on a surface of an aluminum alloy housing substrate;   step b: forming a convex electrophoretic decorative layer on a surface of the aluminum alloy housing substrate on which the first anodic oxidation has been performed via first electrophoretic treatment;   step c: performing mechanical polishing on a surface of the aluminum alloy housing substrate on which the first electrophoretic treatment has been performed;   step d: performing laser carving on a surface of the aluminum alloy housing substrate on which the mechanical polishing has been performed, so as to obtain a texture pattern having a convex-concave effect on the surface of the aluminum alloy housing substrate;   step e: performing a process on portion of the texture pattern on the surface of the aluminum alloy housing substrate, wherein the process is selected from the group consisting of: second electrophoretic treatment, second anodic oxidation, hard anodic oxidation and micro-arc oxidation.   
     
     
         5 . The preparation method according to  claim 4 , wherein the first anodic oxidation or the second anodic oxidation comprises performing pretreatment on the surface of the aluminum alloy housing substrate and then forming an anode film by anodic oxidation. 
     
     
         6 . The preparation method according to  claim 5 , wherein the pretreatment comprises: performing alkali etching for 3-20 s at a temperature of 50-70° C. by using 50-60 g/L of sodium hydroxide, neutralizing for 10-20 s a temperature of 15-25° C. by using 200-300 ml/L of nitric acid, and performing chemical polishing for 5-20 s at a temperature of 90-95° C. by using a chemical polishing solution containing 650-750 ml/L of phosphoric acid and 350-250 ml/L of sulfuric acid. 
     
     
         7 . The preparation method according to  claim 4 , wherein the anodic oxidation comprises oxidizing the surface of the aluminum alloy housing substrate for 15-50 min under an anode voltage of 13-17 V and at a temperature of 10-21° C. by using 190-200 g/L of sulfuric acid. 
     
     
         8 . The preparation method according to  claim 4 , wherein the first electrophoretic treatment or the second electrophoretic treatment comprises electrophoresing for 1-3 min under a voltage of 140-200 V and at a temperature of 28-32° C. by using an electrophoresing solution having a pH of 7-9. 
     
     
         9 . The preparation method according to  claim 4 , wherein the hard anodic oxidation comprises oxidizing for 25-50 min under a temperature of 5-12° C. by using a hard anodic oxidation solution. 
     
     
         10 . The preparation method according to  claim 4 , wherein the hard anodic oxidation solution includes 170-270 g/L of sulfuric acid and 8-20 g/L of oxalic acid. 
     
     
         11 . The preparation method according to  claim 4 , wherein the micro-arc oxidation includes oxidizing for 40-100 min under a temperature of 20-30° C. by using a micro-arc oxidation solution. 
     
     
         12 . The preparation method according to  claim 4 , wherein the micro-arc oxidation solution includes 0.02-0.05 mol/L of sodium silicate and 0.03-0.07 mol/L of sodium hydroxide.