CHROMIUM(III)-CONTAINING AQUEOUS SOLUTION AND PROCESS FOR PRODUCTION OF SAME

WIPO Patent Application WO/2010/026916

A1

A chromium(III)-containing aqueous solution which permits various molar ratios of acid radicals to Cr and which is useful as a trivalent-chromium source or replenisher for surface treatment baths for various metals, characterized by containing a chromium(III) composite salt which is formed by conducting the reduction of chromic acid while making two or more acids present either simultaneously or successively, said acids being selected from among inorganic acids (excluding chromic acid) and organic acids; and a process for the production of a chromium(III)-containing aqueous solution which comprises bringing chromic acid into contact with an acid other than chromic acid and/or an organic reducing agent in an aqueous medium to conduct the reduction of chromic acid, characterized in that the reduction of chromic acid is conducted in a state wherein at least two acids are present as the acid other than chromic acid either simultaneously or successively, said acids being selected from among inorganic acids and organic acids.

BANDA TOMOHIRO (JP)
KUWANO HIROYUKI (JP)

PCT/JP2009/064961

March 11, 2010

August 27, 2009

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NIPPON CHEMICAL IND (JP)
BANDA TOMOHIRO (JP)
KUWANO HIROYUKI (JP)

C01G37/00; C23C22/48; C25D3/06; C25D3/10

JPH06306630A	1994-11-01
JPH06173100A	1994-06-21
JPH0891842A	1996-04-09
JP2005194167A	2005-07-21
JPS59102821A	1984-06-14
JPS4942153A	1974-04-20
JP2007204352A	2007-08-16
US20070086938A1	2007-04-19
JP2003286584A	2003-10-10
JP2009035806A	2009-02-19
JP2006300737A	2006-11-02

NIPPON CHEMICAL INDUSTRIAL CO., LTD. (JP)
Nippon Chemical Industrial Co., Ltd. (JP)

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