logo

For the Inventor, By the Inventor

The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9920416 B1

PDFFull Text
Date of Patent:
Mar. 20, 2018

Filed:

Apr. 18, 2013

Blackening treatment solution for black cr—co alloy plating film

Applicant:

Okuno Chemical Industries Co., Ltd., Osaka-shi, Osaka, JP;

Inventors:

Junichi Katayama, Osaka, JP;

Shingo Nagamine, Osaka, JP;

Ryuichi Tamura, Osaka, JP;

Assignee:

OKUNO CHEMICAL INDUSTRIES CO., LTD., Osaka-shi, JP;

Attorney:

Westerman, Hattori, Daniels & Adrian, LLP

Primary Examiner:

Lois Zheng

Int. Cl.
CPC ...
C23C 22/58 (2006.01); C23C 8/40 (2006.01); C25D 5/48 (2006.01); C25D 9/08 (2006.01); C25D 3/04 (2006.01); C25D 3/06 (2006.01); C25D 3/56 (2006.01); C23C 8/42 (2006.01); C23C 22/00 (2006.01);
U.S. Cl.
CPC ...
C23C 8/40 (2013.01); C23C 8/42 (2013.01); C23C 22/58 (2013.01); C25D 3/04 (2013.01); C25D 3/06 (2013.01); C25D 3/562 (2013.01); C25D 5/48 (2013.01); C25D 9/08 (2013.01);
Abstract

The present invention provides a blackening treatment method for a black Cr—Co alloy plating film, the method comprising bringing a black Cr—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 −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.

Find Patent Forward Citations

Loading…