Masking method used in surface treatment process

Abstract

A masking method used in a surface treating process is disclosed. The masking method includes the following steps: preparing paint, coating the paint on inner surfaces of a hole in a workpiece, and curing the paint, thereby forming a protection coating layer on the inner surfaces of the hole to protect the inner surfaces of the hole during a surface treatment process. The paint is resistant to the surface treatment process, and includes resin and solvent. A surface tension of the paint is smaller than or equal to 22 mN/m.

What is claimed is: 
     
         1 . A masking method used in a surface treating process, comprising steps as follows:
 preparing a paint, the paint being resistant to the surface treating process, the paint comprising a resin and a solvent, and having a surface tension smaller than or equal to about 22 mN/m;   coating a layer of the paint on an inner surface of a hole in a workpiece; and   curing the paint, thereby forming a protection coating layer on the inner surface of the hole to protect the inner surface of the hole being treated in the surface treating process.   
     
     
         2 . The masking method used in the surface treating process of  claim 1 , wherein the surface treating process comprises an anodizing process, the resin is resistant to acid and alkali corrosion, the resin is selected from one or more from the group consisting of fluororesin, silicon resin, silicon rubber, epoxy resin, acrylic resin, and polyurethane resin. 
     
     
         3 . The masking method used in the surface treating process of  claim 1 , wherein a thickness of the protection coating layer is in a range from about 0.1 μm to about 5 μm. 
     
     
         4 . The masking method used in the surface treating process of  claim 1 , wherein the paint further comprises an additive agent, the additive agent is selected from one or more from the group consisting of diluents, curing agent, initiator, sensitizer, adhesion promoter, dispersing agent, wetting agent, thickening agent, and antifoaming agent. 
     
     
         5 . The masking method used in the surface treating process of  claim 1 , wherein the solvent is selected from one or more from the group consisting of isoparaffin, toluene, ethyl acetate, acetone, and butanone. 
     
     
         6 . The masking method used in the surface treating process of  claim 1 , wherein the resin is added by fluoro functional group, hydrocarbon aliphatic functional group, or organosilicon functional group. 
     
     
         7 . The masking method used in the surface treating process of  claim 1 , wherein a solid content of the paint is smaller than or equal to about 30%. 
     
     
         8 . The masking method used in the surface treating process of  claim 1 , wherein the paint is coated on the inner surface of the hole in the workpiece by a brush coating. 
     
     
         9 . The masking method used in the surface treating process of  claim 1 , wherein the paint is coated on the inner surface of the hole in the workpiece by a spray coating. 
     
     
         10 . The masking method used in the surface treating process of  claim 1 , wherein the paint is coated on the inner surface of the hole in the workpiece by a curtain coating.