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.:
Date of Patent:
May. 21, 2024
Filed:
Aug. 16, 2022
Applicant:
Dipsol Chemicals Co., Ltd., Tokyo, JP;
Inventors:
Ryouji Iwanaga, Chiba, JP;
Manabu Inoue, Tokyo, JP;
Tomitaka Yamamoto, Tokyo, JP;
Takahiro Fujino, Tokyo, JP;
Assignee:
Dipsol Chemicals Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 22/30 (2006.01); C23C 22/34 (2006.01); C23C 22/53 (2006.01); C23C 22/00 (2006.01);
U.S. Cl.
CPC ...
C23C 22/53 (2013.01); C23C 22/34 (2013.01); C23C 2222/10 (2013.01);
Abstract
An object is to provide a trivalent chromium chemical conversion treatment liquid for a zinc or zinc alloy base capable of forming an environmentally-friendly chemical conversion coating with high corrosion resistance. The present invention provides a hexavalent chromium-free trivalent chromium chemical conversion treatment liquid for zinc or zinc alloy, the liquid comprising trivalent chromium ions, zirconium ions, nitrate ions, and chain colloidal silica, in which the pH of the treatment liquid is 2.5 to 5.0.