CONVERSION COATING COMPOSITION FOR ZN-AL-MG ALLOY PLATED STEEL SHEET AND ZN-AL-MG ALLOY PLATED STEEL SHEET

WIPO Patent Application WO/2021/125830

A1

The objective of the present invention is to provide a chemical conversion treatment composition and a chemical conversion treatment method for preventing surface tarnish defects occurring in Zn-Al-Mg alloy plated steel sheets and chromated steel sheets. According to the present invention, provided is a chemical conversion treatment composition for a Zn-Al-Mg alloy plated steel sheet comprising, based on the total weight of the chemical conversion treatment composition: 0.2 to 20% by weight of a phosphoric acid amine salt derived from an alkyl phosphate acid and an alkyl amine; 0.1 to 10% by weight of zinc phosphate; 0.1 to 10% by weight of a silicate compound; and the balance being water.

JP2668555	[Title of Invention] Chemical conversion agent and chemical conversion bath
WO/2011/052269	ALLOYED HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
WO/2017/077119	TREATMENT DEVICE AND TREATMENT METHOD COMPRISING A SWIRLING APPARATUS FOR PICKLING AND PHOSPHATING METAL PARTS

JO DU-HWAN (KR)
EUN HEE-JEA (KR)
PARK KYUNG-KWAN (KR)
HAN EUN-SU (KR)

PCT/KR2020/018546

June 24, 2021

December 17, 2020

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POSCO (KR)
STEEL & CONVERGENCE TECH RESEARCH ASSOCIATION (KR)
POSCO COATED & COLOR STEEL CO LTD (KR)

C23C22/08; C23C2/06; C23C28/00

JP2001335964A	2001-12-07
KR20170005742A	2017-01-16
JP2011219832A	2011-11-04
US20040011429A1	2004-01-22
KR20180002136A	2018-01-08

C&S PATENT AND LAW OFFICE (KR)

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