Patent ID: 8758859

Claim:
A method for making a housing, comprising: providing a plastic substrate; forming an activator by mixing silane coupling agent, organic solvent, deionized water, and a leveling agent, the mass ratio of the silane coupling agent, organic solvent, deionized water, and leveling agent being (3-5):(85-92):(3-5):(5-10), the leveling agent of the activator being cetyl trimethyl ammonium bromide; coating the activator on the surface of the plastic substrate and drying to form an active layer; forming a coating solution by mixing silicon ester or titanium ester, organic solvent, deionized water, and a leveling agent, the mass ratio of the silicon ester or titanium ester, organic solvent, deionized water, and leveling agent being (45-55):(35-45):(3-5):(3-5), the leveling agent of the coating solution being cetyl trimethyl ammonium bromide; and coating the surface of the active layer with the coating solution and drying the coating solution to form an exterior layer.