Search International and National Patent Collections

1. (WO2018123996) SURFACE TREATMENT AGENT FOR GALVANIZED STEEL SHEETS

Pub. No.:    WO/2018/123996    International Application No.:    PCT/JP2017/046495
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Tue Dec 26 00:59:59 CET 2017
IPC: C23C 22/53
Applicants: NIPPON PAINT SURF CHEMICALS CO., LTD.
日本ペイント・サーフケミカルズ株式会社
Inventors: UTSUNOMIYA Akira
宇都宮 朗
MIURA Yusuke
三浦 裕佑
MIYAMOTO Sachiyo
宮本 祿代
Title: SURFACE TREATMENT AGENT FOR GALVANIZED STEEL SHEETS
Abstract:
Provided is a surface treatment agent for galvanized steel sheets, the surface treatment agent having excellent film formability and being capable of providing a coating film having excellent corrosion resistance, chemical resistance, and weather resistance. The surface treatment agent for galvanized steel sheets contains a zirconium compound (A), a chelating agent (B) having at least one hydroxyl group in one molecule, and an organic resin (C) having a carboxyl group (c1), wherein the content of the zirconium compound (A) in the surface treatment agent for galvanized steel sheets is in the range of 200-1000 mass ppm, the molar ratio of elemental zirconium (Zr) derived from the zirconium compound (A) to the chelating agent (B), i.e., (Zr)/(B), is in the range of 4-100, the acid value of the organic resin (C) is in the range of 10-30 mgKOH/g, and the molar ratio of the carboxyl group (c1) to the chelating agent (B), i.e., (c1)/(B), is in the range of 30-1000.