Surface-treated steel sheets of good white rust resistance,...

Details Surface-treated steel sheets of good white rust resistance,... Surface-treated steel sheets of good white rust resistance,...

2007-11-06

2007-11-06

Lavilla, Michael E. (Department: 1775)

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

C428S632000, C428S653000, C428S659000, C428S681000, C428S215000, C428S336000, C428S418000, C428S447000, C428S457000, C428S469000, C427S372200, C427S384000, C427S385500, C427S388100

Reexamination Certificate

active

10515303

ABSTRACT:
The invention is to provide a surface-treated steel sheet of good white rust resistance with no chromium in its surface treatment film, and it has realized a surface-treated steel sheet of higher-level corrosion resistance by forming a reaction layer of plating metal with a barrier layer effective for anticorrosion not in a two-layered film but in a single-layered film. The surface-treated steel sheet is fabricated by applying a surface-treating composition that contains:(a) a water-dispersible resin and/or a water-soluble resin obtained through reaction of an epoxy group-containing resin (A) with an active hydrogen-containing compound (B) a part or all of which is an active hydrogen-containing hydrazine derivative and preferably with a hydrophilic organic component (C),(b) a silane coupling agent,(c) a phosphoric acid and/or a hexafluoro-metal acid, and(d) preferably an aqueous dispersion of an urethane resin, to a zinc-plated or aluminium-plated steel sheet followed by drying it to form thereon a surface treatment film having a thickness of from 0.02 to 5 μm. Regarding its film structure, the surface treatment film comprises an amorphous compound layer containing P, Zn and/or Al, and O, and an overlying organic resin matrix layer where the matrix is a hydrazine derivative-modified epoxy group-containing resin or the epoxy group-containing resin and an urethane resin.

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Copy of the European communication dated Sep. 13, 2005.

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