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:
Jul. 18, 2023
Filed:
Mar. 23, 2022
Nippon Paint Surf Chemicals Co., Ltd., Tokyo, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Takayuki Ueno, Tokyo, JP;
Yu Koganezawa, Tokyo, JP;
Yuki Kasahara, Tokyo, JP;
Osamu Izumi, Tokyo, JP;
Yuji Ohtake, Tokyo, JP;
Yuya Kotani, Tokyo, JP;
Koichiro Izumi, Tokyo, JP;
Tatsumasa Hidaka, Tokyo, JP;
Katsuyoshi Kaneko, Tokyo, JP;
NIPPON PAINT SURF CHEMICALS CO., LTD., Tokyo, JP;
HONDA MOTOR CO., LTD., Tokyo, JP;
Abstract
Provided is a method of performing pre-paint treatment of an automobile body including a high-tensile steel sheet, in which desirable corrosion resistance can be obtained after painting. A method of performing pre-paint treatment of an automobile body, the method including performing an alkaline degreasing step, a first water-washing step, a chemical conversion treatment step, a second water-washing step, and a cationic electrodeposition painting step, in this order, wherein the chemical conversion treatment step is performed using an chemical conversion treatment agent including zirconium (A), free fluorine ions (B), an allylamine-diallylamine copolymer (C), aluminum ions (D), nitrate ions (E) each at a predetermined concentration; the allylamine-diallylamine copolymer (C) forms an acid addition salt having an anionic counter ion, and the pKa of an acid thereof falls within the range of −3.7 to 4.8; and the content percentage of diallylamine is 80 mol % or more and 98 mol % or less.