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Title:
CHEMICAL CONVERSION TREATMENT LIQUID, AND METHOD FOR MANUFACTURING MEMBER IN WHICH CHEMICAL CONVERSION FILM IS PROVIDED ON SURFACE
Document Type and Number:
WIPO Patent Application WO/2022/209019
Kind Code:
A1
Abstract:
The chemical conversion treatment liquid according to the present invention is free of cobalt and can form a chemical conversion film having exceptional corrosion resistance, the chemical conversion treatment liquid containing a water-soluble trivalent-chromium-containing substance, a water-soluble titanium-containing substance, and a water-soluble lactic-acid-containing substance as essential components, and moreover containing a water-soluble glycolic-acid-containing substance and a water-soluble inactive-organic-acid-containing substance, which is a water-soluble organic-acid-containing substance based on an inactive organic acid that is an organic acid other than lactic acid or glycolic acid, as at least some discretionarily contained components. When the chemical conversion treatment liquid contains neither the water-soluble glycolic-acid-containing substance nor the water-soluble inactive-organic-acid-containing substance, expressions (1) to (3) are satisfied by the molar concentration CTi of the water-soluble titanium-containing substance in terms of titanium, the molar concentration CCr of the water-soluble trivalent-chromium-containing substance in terms of chromium, and the molar concentration CLc of the water-soluble lactic-acid-containing substance in terms of lactic acid.　Expression (1): CTi/CCr≥0.5 Expression (2): CLc/(CTi+CCr)≥0.40 Expression (3): CLc/CTi≤2.6

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Inventors:
NIWA TSUKASA (JP)
OOGUCHI MASAYUKI (JP)
HIRAMATSU YOSHIKI (JP)
Application Number:
PCT/JP2021/045086
Publication Date:
October 06, 2022
Filing Date:
December 08, 2021
Export Citation:
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Assignee:
YUKEN IND CO LTD (JP)
International Classes:
C23C22/53
Domestic Patent References:
WO2012137677A12012-10-11
Foreign References:
JP2014159627A2014-09-04
JP2016132785A2016-07-25
JP6085831B12017-03-01
JP2005281852A2005-10-13
JP2002194559A2002-07-10
JP2002226981A2002-08-14
JP6868313B12021-05-12
JP2010196174A2010-09-09
Attorney, Agent or Firm:
OKUBO, Katsuyuki (JP)
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