SURFACE-TREATED STEEL MATERIAL

WIPO Patent Application WO/2021/065485

A1

The present invention addresses the problem of providing a surface-treated steel material which is capable of exhibiting excellent rust prevention performance for a long period of time, while additionally exhibiting excellent moisture resistance. The present invention provides a surface-treated steel material which is obtained by forming a coating film on the surface of a steel material with a base layer being interposed therebetween, said base layer containing at least an aluminum/zinc alloy plating layer, wherein: the aluminum/zinc alloy plating layer contains, as constituent elements, Al, Zn, Si and Mg; the Mg content is from 0.1% by mass to 10% by mass; the aluminum/zinc alloy plating layer contains from 0.2% by volume to 15% by volume of an Si-Mg phase; the mass ratio of Mg in the Si-Mg phase to the total Mg amount in the plating layer is 3% or more; the coating film is formed from a rust preventive coating material composition that contains (A) a coating film forming resin, (B) a crosslinking agent and (C) magnesium oxide; the magnesium oxide (C) has a lattice constant of 0.4214 nm or less; and the coating film has a BET specific surface area of 2.0 m2/g or less.

TAKATA TERUO (JP)
KUMAKURA SHINTARO (JP)
TOZAKI YOICHI (JP)
UCHIHASHI RYO (JP)
YAOITA SATOSHI (JP)

PCT/JP2020/034943

April 08, 2021

September 15, 2020

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NIPPON STEEL COATED SHEET CORP (JP)
NIPPON PAINT IND COATINGS CO LTD (JP)

B05D7/14; B05D7/24; B32B15/09; B32B15/095; B32B15/18; B32B15/20; B32B27/36; B32B27/40; C01F5/02; C09C1/02; C09D5/10; C09D7/63; C09D175/06; C23C2/06; C23C2/12; C23C2/26; C23C28/00; C23F11/00

JP2017197795A	2017-11-02
JP2011068868A	2011-04-07

YAMAO, Norihito et al. (JP)

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