AQUEOUS TREATING SOLUTION FOR FORMING BLACK TRIVALENT-CHROMIUM CHEMICAL CONVERSION COATING ON ZINC OR ZINC ALLOY AND METHOD OF FORMING BLACK TRIVALENT-CHROMIUM CHEMICAL CONVERSION COATING

WIPO Patent Application WO/2007/100135

A1

A treating solution for forming on a surface of either zinc or a zinc alloy a hexavalent-chromium-free trivalent-chromium chemical conversion coating which has an even black appearance and satisfactory corrosion resistance. The treating solution has a long treating-bath life. Also provided is a method of forming a black trivalent-chromium chemical conversion coating. The aqueous treating solution, which is for forming a black trivalent-chromium chemical conversion coating on zinc or a zinc alloy, contains trivalent chromium ions, a phosphoric ester and/or phosphorous ester, and a sulfur compound. The method is a method of chemically treating zinc or a zinc alloy which comprises using the aqueous treating solution to chemically treat the zinc or zinc alloy at a solution temperature of 10-60°C, whereby a black trivalent-chromium chemical conversion coating is formed on the zinc or zinc alloy. Furthermore provided is a coated zinc or zinc alloy metal which comprises zinc or a zinc alloy and, formed thereon, a black trivalent-chromium chemical conversion coating formed by a chemical treatment with the aqueous treating solution.

INOUE MANABU (JP)

PCT/JP2007/054153

September 07, 2007

March 05, 2007

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DIPSOL CHEM (JP)
INOUE MANABU (JP)

C23C22/53

JP2005206872A	2005-08-04
JP2005187925A	2005-07-14
JPH08239776A	1996-09-17

KUMAKURA, Yoshio et al. (Shin-Tokyo Bldg. 3-1, Marunouchi 3-chom, Chiyoda-ku Tokyo, JP)

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