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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 10577708 B1

PDFFull Text
Date of Patent:
Mar. 03, 2020

Filed:

Aug. 08, 2014

Multi-layered coating film formation method

Applicant:

Kansai Paint Co., Ltd., Hyogo, JP;

Inventors:

Yukihiro Nemoto, Kanagawa, JP;

Hideki Matsuda, Kanagawa, JP;

Assignee:

KANSAI PAINT CO., LTD., Hyogo, JP;

Attorney:

Wenderoth, Lind & Ponack, L.L.P.

Primary Examiner:

Xiuyu Tai

Int. Cl.
CPC ...
C25D 9/02 (2006.01); C23C 22/34 (2006.01); C25D 13/20 (2006.01); C09D 5/44 (2006.01); C23C 22/36 (2006.01); C23C 22/83 (2006.01); C25D 13/22 (2006.01); C09D 163/00 (2006.01); C09D 175/04 (2006.01); C23C 22/48 (2006.01); C23C 22/82 (2006.01); C25D 5/34 (2006.01); C25D 7/00 (2006.01); C25D 13/12 (2006.01);
U.S. Cl.
CPC ...
C25D 9/02 (2013.01); C09D 5/4438 (2013.01); C09D 5/4453 (2013.01); C09D 163/00 (2013.01); C09D 175/04 (2013.01); C23C 22/34 (2013.01); C23C 22/36 (2013.01); C23C 22/48 (2013.01); C23C 22/82 (2013.01); C23C 22/83 (2013.01); C25D 5/34 (2013.01); C25D 7/00 (2013.01); C25D 13/20 (2013.01); C25D 13/22 (2013.01); C25D 13/12 (2013.01);
Abstract

A problem to be solved by the present invention is to provide a method for forming a multilayer coating film, the method being capable of achieving excellent finished appearance and excellent corrosion resistance without affecting electrodeposition coatability even when a part or all of the water-washing step is omitted after chemical conversion treatment, and to provide a coated article. The invention provides a method for forming a multilayer coating film, comprising forming a chemical conversion coating film and an electrodeposition coating film on a metal substrate by Step 1 of immersing a metal substrate in a chemical conversion treatment solution to form a chemical conversion coating film, and Step 2 of omitting a part or all of the water-washing step, and performing electrodeposition coating on the metal substrate using a cationic electrodeposition coating composition to form an electrodeposition coating film, wherein when the electrodeposition coating is performed in Step 2, the solution adhered to and/or deposited on the metal substrate has an electrical conductivity of less than 10,000 μS/cm.

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