Surface treatment method for metal housing

Abstract

A surface treatment method for a metal housing includes: providing a metal housing made of an oxidizable alloy; performing a surface treatment on the metal housing, to obtain a semi-finished housing, the surface treatment comprises at least one selected from the group consisting of a micro-arc oxidation treatment, a surface painting treatment, a surface cutting treatment, a surface drawing treatment, and a surface defect treatment, the semi-finished housing comprising a substrate-exposed region; and performing a filming treatment on the semi-finished housing, to passivate the substrate-exposed region.

What is claimed is: 
     
         1 . A surface treatment method for a metal housing, comprising:
 providing a metal housing made of an oxidizable alloy;   performing a surface treatment on the metal housing, to obtain a semi-finished housing, the surface treatment comprising at least one selected from the group consisting of a micro-arc oxidation treatment, a surface painting treatment, a surface cutting treatment, a surface drawing treatment, and a surface defect treatment, the semi-finished housing comprising a substrate-exposed region; and   performing a filming treatment on the semi-finished housing, to passivate the substrate-exposed region.   
     
     
         2 . The surface treatment method for a metal housing according to  claim 1 , further comprising: performing an anodic electrodeposition treatment on the semi-finished housing, the pH value of a treatment environment of the anodic electrodeposition treatment is 4 to 6. 
     
     
         3 . The surface treatment method for a metal housing according to  claim 1 , wherein the oxidizable alloy is a magnesium alloy or an aluminum alloy. 
     
     
         4 . The surface treatment method for a metal housing according to  claim 1 , wherein the surface treatment comprises the micro-arc oxidation treatment, the surface painting treatment, and the surface cutting treatment. 
     
     
         5 . The surface treatment method for a metal housing according to  claim 4 , wherein the surface cutting treatment is an edge cutting treatment. 
     
     
         6 . The surface treatment method for a metal housing according to  claim 1 , wherein the surface treatment comprises the surface defect treatment and the surface drawing treatment. 
     
     
         7 . The surface treatment method for a metal housing according to  claim 1 , wherein the filming treatment comprises an electrical film formation step. 
     
     
         8 . The surface treatment method for a metal housing according to  claim 7 , wherein the pH value of a treatment environment of the electrical film formation step is 7 to 10. 
     
     
         9 . The surface treatment method for a metal housing according to  claim 7 , wherein the filming treatment comprises the electrical film formation step and a heating film formation step. 
     
     
         10 . The surface treatment method for a metal housing according to  claim 9 , wherein the pH value of a treatment environment of the heating film formation step is 5 to 7. 
     
     
         11 . The surface treatment method for a metal housing according to  claim 1 , wherein the filming treatment is performed by using a non-phosphate filming agent or a non-chromate filming agent.