Title:
ZINC OR ZINC ALLOY COATED STEEL SHEET WITH SURFACE TREATMENT FILM, AND METHOD OF PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2015/080066
Kind Code:
A8
Abstract:
Provided is a zinc or zinc alloy coated steel sheet with a surface treatment film, wherein said zinc or zinc alloy coated steel sheet has (1) excellent resistance to darkening after being subjected to rigorous ironing such as continuous high-speed press forming, (2) excellent resistance to flake-like peeling after being subjected to rigorous ironing such as continuous high-speed press forming, and (3) resistance to blackening that is less dependent on the adhesion amount. This zinc or zinc alloy coated steel sheet with a surface treatment film includes: a zinc or zinc alloy coated steel sheet; and a surface treatment film including a first film on the zinc or zinc alloy coated steel sheet, and a second film on the first film. The first and second films are each obtained by: applying a surface treatment solution containing a zirconium carbonate compound (A), a phosphate compound (B), a tetraalkoxysilane (C), and a silane coupling agent (D) including an epoxy group; and heating and drying said solution. The first film contains a large amount of the phosphate compound (B), and the second film contains a small amount of the phosphate compound (B).
Inventors:
OKUMURA YUSUKE (JP)
OKAI KAZUHISA (JP)
IMOKAWA TORU (JP)
MATSUZAKI AKIRA (JP)
TANDOKORO KOHEI (JP)
HAMADA ETSUO (JP)
OKAI KAZUHISA (JP)
IMOKAWA TORU (JP)
MATSUZAKI AKIRA (JP)
TANDOKORO KOHEI (JP)
HAMADA ETSUO (JP)
Application Number:
PCT/JP2014/080990
Publication Date:
May 26, 2016
Filing Date:
November 18, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C22/07; C23C28/00
Attorney, Agent or Firm:
SUGIMURA, Kenji (3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, JP)
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