| abstract |
(57) [Problem] To provide a plating film having excellent adhesion strength when a resin molded product having a large residual internal stress is used as a plating material. After treating a molded article with an acid or an organic solvent, it is brought into contact with a solution containing ozone, and then an alkaline solution containing at least one of an anionic surfactant and a nonionic surfactant and an alkali component. To process. By treating with an acid or an organic solvent before the ozone treatment, the adhesion strength of the plating film in a portion where the residual internal stress is large is improved. |