| abstract |
As a method of treating a Cr-free plastic surface, there is provided a method of treating a plastic surface capable of plating sufficiently adhered to a plastic surface. Characterized in that the plastic is treated with a solution in which sulfuric acid is electrolyzed. The sulfuric acid concentration of the sulfuric acid solution is preferably 50 to 92 wt%, the persulfuric acid concentration is 3 g / ℓ or more, and the treatment temperature is 80 ° C. or more, for example, 80 to 140 ° C., particularly 100 to 130 ° C. By immersing the plastic in the sulfuric acid solution for 1 minute to 10 minutes, a hydrophilic functional group is exposed on the surface of the plastic. |