Device housing and method for making the device housing

Abstract

A method for making a device housing includes the steps of: providing a substrate; forming a base paint layer on the substrate by spraying; sensitizing a surface of the base paint layer; activating the surface of the base paint layer; providing a first water solution and a second water solution, the first water solution containing silver nitrate and ammonia water, the second water solution containing potassium sodium tartrate and sodium hydroxide; forming a silver layer on the sensitized and activated surface of the base paint layer by simultaneously spraying the first water solution and the second water solution on the sensitized and activated surface of the base paint layer; and forming a protective layer on the silver layer.

What is claimed is: 
     
         1 . A method for making a device housing, comprising:
 providing a substrate;   forming a base paint layer on the substrate by spraying;   sensitizing a surface of the base paint layer;   activating the surface of the base paint layer;   providing a first water solution and a second water solution, the first water solution containing silver nitrate and ammonia water, the second water solution containing potassium sodium tartrate and sodium hydroxide;   forming a silver layer on the sensitized and activated surface of the base paint layer by simultaneously spraying the first water solution and the second water solution on the sensitized and activated surface of the base paint layer;   forming a protective layer on the silver layer.   
     
     
         2 . The method as claimed in  claim 1 , wherein the silver nitrate has a concentration of about 20 g/L to about 40 g/L, the ammonia water has a concentration of about 30 g/L to about 50 g/L, the potassium sodium tartrate has a concentration of about 80 g/L to about 100 g/L, and the sodium hydroxide has a concentration of about 10 g/L to about 20 g/L. 
     
     
         3 . The method as claimed in  claim 2 , wherein the first and second water solutions have a temperature of about 90° C. to about 110° C., and have a spraying pressure of about 1000 Pa to about 1500 Pa. 
     
     
         4 . The method as claimed in  claim 1 , wherein sensitizing the surface of the base paint layer is carried out by spraying sensitizing water solution to the base paint layer, the sensitizing water solution contains hydrochloric acid having a concentration of about 250 g/L to about 400 g/L, tin dichloride having a concentration of about 50 g/L to about 100 g/L, and potassium sodium tartrate having a concentration of about 80 g/L to about 160 g/L. 
     
     
         5 . The method as claimed in  claim 1 , wherein activating the surface of the base paint layer is carried out by dipping the base paint layer in an activating water solution for about 5 seconds to about 20 seconds, the activating water solution contains hydrochloric acid having a concentration of about 20 g/L to about 50 g/L, and palladium chloride having a concentration of about 0.1 g/L to about 0.5 g/L. 
     
     
         6 . The method as claimed in  claim 1 , wherein the base paint layer comprises acrylic acid epoxy resin. 
     
     
         7 . The method as claimed in  claim 1 , wherein the protective layer is a paint layer comprising transparent or translucent resin formed by spraying. 
     
     
         8 . The method as claimed in  claim 1 , wherein the substrate is made of metal or non-metal. 
     
     
         9 . The method as claimed in  claim 8 , wherein the metal is aluminum, aluminum alloy, magnesium, or magnesium alloy, the non-metal is plastic.