CHEMICAL CONVERSION COATED PLATED STEEL SHEET AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2011/158516

A1

Disclosed is a chemical conversion coated Al-plated steel sheet which has excellent weather resistance, water resistance and coating film adhesion. Specifically, a chemical conversion coating liquid is applied over and dried on the surface of an Al alloy-plated steel sheet, thereby forming a chemical conversion coating film that has a film thickness of 0.5-10 μm. The chemical conversion coating liquid contains: a fluorine-containing olefin resin, which contains 7-20% by mass of F atoms and 0.05-5% by mass of hydrophilic functional groups that are selected from among a carboxyl group, a sulfonic acid group and salts of carboxyl group and sulfonic acid group and has a number average molecular weight within the range of 1,000-2,000,000; and an oxygen acid salt, fluoride, hydroxide, organic acid salt, carbonate or peroxygenated salt of a group 4A metal. The amount of the oxygen acid salt, fluoride, hydroxide, organic acid salt, carbonate or peroxygenated salt of a group 4A metal relative to the fluorine-containing olefin resin in the chemical conversion coating liquid is within the range of 0.1-5% by mass in terms of the metal.

MATSUNO MASANORI
UEDA KOICHIRO
YAMAMOTO MASAYA
TAKETSU HIROFUMI

PCT/JP2011/003483

December 22, 2011

June 17, 2011

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NISSHIN STEEL CO LTD (JP)
MATSUNO MASANORI
UEDA KOICHIRO
YAMAMOTO MASAYA
TAKETSU HIROFUMI

C23C28/00; B32B15/082; C23C22/36

JP2003105555A	2003-04-09
JPH03271377A	1991-12-03
JP2001011645A	2001-01-16
JP2007321223A	2007-12-13
JP2001335955A	2001-12-07
JP2003293169A	2003-10-15

WASHIDA, KIMIHITO (JP)
Koichi Washida (JP)

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