Processing method of magnesium alloy appearance part

Abstract

A processing method of a magnesium alloy appearance part at least includes: providing a magnesium alloy substrate; performing a machining process on the magnesium alloy substrate to form a machined surface on the magnesium alloy substrate; performing an antioxidant treatment on the magnesium alloy substrate after the machining process; performing an electrolysis treatment on the magnesium alloy substrate after the antioxidant treatment, so as to form a porous oxide layer on the magnesium alloy substrate; and forming a sealing layer on the porous oxide layer, so as to obtain the magnesium alloy appearance part. The machined surface of the magnesium alloy appearance part has a glossiness ranging from 250 GU to 450 GU.

What is claimed is: 
     
         1 . A processing method of a magnesium alloy appearance part, comprising:
 providing a magnesium alloy substrate;   performing a machining process on the magnesium alloy substrate to form a machined surface on the magnesium alloy substrate;   performing an antioxidant treatment on the magnesium alloy substrate after the machining process;   performing an electrolysis treatment on the magnesium alloy substrate after the antioxidant treatment, so as to form a porous oxide layer on the magnesium alloy substrate; and   performing an electro-sealing treatment on the magnesium alloy substrate after the electrolysis treatment to form a sealing layer on the porous oxide layer, so as to obtain the magnesium alloy appearance part;   wherein the machined surface of the magnesium alloy appearance part has a glossiness ranging from 250 GU to 450 GU and no acidic agent or solution is used in the processing method.   
     
     
         2 . The processing method according to  claim 1 , wherein the machining process includes applying a cutting oil to the magnesium alloy substrate, and the cutting oil does not contain water. 
     
     
         3 . The processing method according to  claim 1 , wherein the antioxidant treatment includes impregnating the magnesium alloy substrate in an alkaline antioxidant solution. 
     
     
         4 . The processing method according to  claim 3 , wherein the alkaline antioxidant solution includes 1 wt % to 50 wt % of sodium hydroxide or potassium hydroxide. 
     
     
         5 . The processing method according to  claim 1 , wherein an electrolytic solution used in the electrolysis treatment includes 5 wt % to 15 wt % of potassium hydroxide, and conditions of the electrolysis treatment include an operating voltage from 40 V to 80 V, a temperature from 25° C. to 40° C., and a treatment time from 20 minutes to 60 minutes. 
     
     
         6 . The processing method according to  claim 5 , wherein the electrolysis treatment is an anodizing treatment using a pulse current, and wherein a pulse voltage ranges from 40 V to 80V, a frequency ranges from 5,000 Hz to 100,000 Hz, a duty cycle ranges from 40% to 90%, and the treatment time ranges from 20 minutes to 60 minutes. 
     
     
         7 . The processing method according to  claim 1 , wherein, before forming the porous oxide layer on the magnesium alloy substrate by performing the electrolysis treatment on the magnesium alloy substrate after the antioxidant treatment, the processing method further includes performing a pretreatment on the magnesium alloy substrate; wherein the pretreatment includes alkaline degreasing, decarburization, hot alkali cleaning, or a combination thereof. 
     
     
         8 . The processing method according to  claim 1 , wherein, before forming the sealing layer on the porous oxide layer, the processing method further includes performing a dyeing treatment on the magnesium alloy substrate; wherein the dyeing treatment includes using an alkaline reactive dye to fill a plurality of holes in the porous oxide layer. 
     
     
         9 . The processing method according to  claim 1 , wherein a solid content of a resin composition used in the electro-sealing treatment ranges from 5 wt % to 20 wt %, and conditions of the electro-sealing treatment include an operating voltage from 10 V to 100 V, a temperature from 25° C. to 35° C., and a treatment time from 1 minute to 5 minutes. 
     
     
         10 . The processing method according to  claim 9 , wherein the resin composition includes an epoxy resin or an acrylic resin.