Okuno Chemical Industries Co., Ltd.

Shingo Nagamine

Koji Kita

Kuniaki Otsuka

Junichi Katayama

Ryuichi Tamura

The present invention provides a resin plating method using an etching bath containing manganese as an active ingredient, the method being capable of maintaining stable etching performance even during continuous use. The resin plating method includes: an etching step, which uses a resin material-containing article as an object to be treated and etches the article using an acidic etching bath containing manganese; a catalyst application step, which uses palladium as a catalyst metal; and an electroless plating step; and the method further includes a step of maintaining the palladium concentration in the acidic etching bath at 100 mg/L or less.

Resin plating method

The present invention provides a blackening treatment method for a black Cr&#x2014;Co alloy plating film, the method comprising bringing a black Cr&#x2014;Co alloy plating film having a Cr content of 1 to 15 wt. % into contact with a blackening treatment solution comprising an aqueous solution with a pH value of &#x2212;1 to 5. According to the present invention, the blackish color of a less blackish plating film formed from a plating bath containing trivalent chromium is enhanced to further improve decorativeness. Furthermore, the corrosion resistance of the film can be more improved by performing electrolytic chromate treatment after blackening treatment.

Blackening treatment solution for black Cr&#x2014;Co alloy plating film

The present invention provides a composition for etching treatment of a resin material, the composition comprising an aqueous solution having a permanganate ion concentration of 0.2 mmol/L or more and a total acid concentration of 10 mol/L or more, and the aqueous solution satisfying at least one of the following conditions (1) to (3): The composition for etching treatment of the present invention is a composition containing no hexavalent chromium and having excellent etching performance and good bath stability.

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Osaka, Japan

Shingo Nagamine