Title:
塗膜の耐傷付き性及び耐吸湿性が良好で端面赤錆耐食性に優れるプレコート鋼板
Document Type and Number:
Japanese Patent JP6760489
Kind Code:
B2
Abstract:
A chromate-free-type precoated steel sheet having excellent end-surface rust corrosion resistance and good scratch resistance and moisture absorption resistance in a coating film, the precoated steel sheet characterized by having on both surfaces of a galvanized steel sheet a chromate-free-type chemical conversion treatment layer and a plurality of coating films including at least a top-layer coating film and an underlayer coating film adjacent thereto, the coating films being formed on the chromate-free-type chemical conversion treatment layer, the top-layer coating film on one surface satisfying the conditions of (1) the contact angle of a coating film surface with respect to water being 65-75°, (2) the thickness of the coating film being 0.5-5 µm, (3) the coating film including a first pigment, and the pigment content being 15-70% by mass with respect to the dry mass of the coating film, (4) the total amount of pigment having an average primary particle diameter of 1 µm or greater among the first pigment being 5% by mass or more with respect to the dray mass of the coating film, and (5) the coating film containing 1-10% by mass of a particulate wax having an average particle diameter of 1-8 µm with respect to the dry mass of the coating film, at least a portion of the particulate wax particles being in a state of partially protruding from the coating film surface, and the underlayer coating film containing a second pigment that is one or more species of deliquescent rust preventive pigment.
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Inventors:
Hiroyasu Furukawa
Kawamura Yasuaki
Kawamura Yasuaki
Application Number:
JP2019511308A
Publication Date:
September 23, 2020
Filing Date:
April 05, 2018
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B32B15/08; C09D5/00; C09D5/08; C09D7/61; C09D7/65; C09D191/06; C09D201/00
Domestic Patent References:
| JP2016193593A | ||||
| JP2013018263A | ||||
| JP9323376A | ||||
| JP2007223556A | ||||
| JP2010083075A | ||||
| JP9143423A |
Foreign References:
| WO2011071175A1 |
Attorney, Agent or Firm:
Atsushi Aoki
Shinji Mitsuhashi
Fukuchi Ritsuo
Manabu Saito
Yoshihiro Kobayashi
Shinji Mitsuhashi
Fukuchi Ritsuo
Manabu Saito
Yoshihiro Kobayashi