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Title:
PROCESS FOR PRODUCTION OF TIN-PLATED STEEL SHEETS, TIN-PLATED STEEL SHEETS AND CHEMICAL CONVERSION TREATMENT FLUID
Document Type and Number:
WIPO Patent Application WO/2009/139480
Kind Code:
A1
Abstract:
A chemical conversion treatment fluid which contains aluminum primary phosphate in an amount exceeding 18g/L and up to 200g/L and has a pH of 1.5 to 2.4; and a process for the production of tin-plated steel sheets which comprises forming an Sn-containing plating layer on at least one side of a steel sheet in a coating weight of 0.05 to 20g/m2 per side, subjecting the plated steel sheet either to dipping in the chemical conversion treatment fluid or to cathodic electrolysis in the chemical conversion treatment fluid at a current density of 10A/dm2 or below, and then drying the resulting steel sheet to form a chemical conversion coating.  The process involving the use of the treatment fluid can give, through low-cost chemical conversion treatment and even without using Cr causative of environmental problems, a tin-plated steel sheet wherein the surface appearance or the close adhesion of a coating is inhibited from being deteriorated by surface oxidation of the tin plating layer.

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Inventors:
SUZUKI TAKESHI (JP)
NAKAMURA NORIHIKO (JP)
IWASA HIROKI (JP)
Application Number:
PCT/JP2009/059101
Publication Date:
November 19, 2009
Filing Date:
May 11, 2009
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
SUZUKI TAKESHI (JP)
NAKAMURA NORIHIKO (JP)
IWASA HIROKI (JP)
International Classes:
C23C22/20; C23C28/00; C25D5/26; C25D5/50; C25D11/36
Foreign References:
JPS5035042A1975-04-03
JPS5947396A1984-03-17
JP2003193256A2003-07-09
JPH11350157A1999-12-21
JPS5524516B21980-06-30
JPS5841352B21983-09-12
JPS4928539A1974-03-14
JP2005029808A2005-02-03
JP2007239091A2007-09-20
Other References:
See also references of EP 2290129A4
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JFE TECHNO-RESEARCH CORPORATION 7th Floor Yanagiya Building,1-10,Nihonbashi 2-chome, Chuo-k, Tokyo 27, JP)
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