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Title:
COMPOSITION FOR CHEMICAL TREATMENT AND PROCESS FOR PRODUCING MEMBER WITH CHEMICAL CONVERSION COATING FILM FORMED FROM SAID COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2012/137677
Kind Code:
A1
Abstract:
Provided is a liquid for chemical treatment capable of forming a chemical conversion coating film which is excellent in terms of corrosion resistance and appearance and which is inhibited from releasing hexavalent chromium. This liquid for chemical treatment is a water-based acidic composition which contains a water-soluble trivalent-chromium-containing substance, the amount of the substance being 0.05 mol/L or more in terms of chromium amount with respect to the whole composition, and one or more water-soluble hydroxycarboxylic acid substances selected from the group consisting of hydroxycarboxylic acids and ions, salts, and coordination compounds thereof, wherein the ratio of the molar concentration of the water-soluble hydroxycarboxylic acid substances in terms of the concentration of the hydroxycarboxylic acid(s) to the molar concentration of the water-soluble trivalent-chromium-containing substance in terms of chromium concentration is 0.4 or higher but less than 2.5.

Inventors:
HIRAMATSU YOSHIKI (JP)
ASANO MARI (JP)
Application Number:
PCT/JP2012/058532
Publication Date:
October 11, 2012
Filing Date:
March 30, 2012
Export Citation:
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Assignee:
YUKEN KOGYO CO LTD (JP)
HIRAMATSU YOSHIKI (JP)
ASANO MARI (JP)
International Classes:
C23C22/48
Foreign References:
JP2009149926A2009-07-09
JP2005126797A2005-05-19
JP2008255407A2008-10-23
JP2009299179A2009-12-24
JP2010529300A2010-08-26
JP2010196174A2010-09-09
JP4568863B22010-10-27
Attorney, Agent or Firm:
HAYAKAWA, Yuzi et al. (JP)
Yuji Hayakawa (JP)
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Claims:



 
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