Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
1999-05-14
2002-03-26
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of metal
C427S435000, C106S014130, C106S014430
Reexamination Certificate
active
06361872
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to metal surface treatment agents and methods of treating metal surfaces by their utilization. Specifically, it relates to metal surface treatment agents which can form a cured coating to provide anticorrosion coating on metal surfaces, methods of treating metal surfaces by providing anticorrosion treatment by their utilization and pre-coated steel substrates treated with the metal surface treatment agents of the present invention. The present invention specifically relates to methods of treating metal surfaces by providing anticorrosion treatment to the surface of iron, zinc, aluminum, copper, magnesium and their alloys.
BACKGROUND OF THE INVENTION
The surface of metals such as iron, etc. easily gets rusted without any treatment, so usually various types of anticorrosion treatments are provided to the surface.
As one type of the above described anticorrosion treatments, there has been widely performed a chromate treatment in which electrical and chemical plating of a metal more base than iron is performed such as zinc plating, alloy zinc plating, aluminum plating, etc. and further the metal surface is treated using a treatment agent having a hexavalent chromium such as dichromic acid, chromic anhydride, etc. as a primary component.
Examples of the above described chromate treatments are a reactive chromate treatment such as yellow chromate treatment, coating type chromate treatment, etc.
The anticorrosive action of the chromate treatment so far is not yet completely understood, but It is assumed that chromic acid, contained in treatment agents, is reduced on metal surfaces, such as steel, to form a coating layer and this coating layer has the effect of a passivated action on the treated metal surfaces.
The above described chromate treatment excels in forming a coating excelling in anticorrosion effect on the surface of zinc plated steels and others which easily get rusty. However, recently because of environmental reasons, there has been an active movement to regulate use of hexavalent chromium compounds in metal surface treatment.
SUMMARY OF THE INVENTION
The present invention can provide metal surface treatment agents and metal surface treatment methods which have little impact on the environment because of non-use of hazardous compounds such as hexavalent chromium compounds and which can provide desirable anticorrosion effect to metal surfaces when compared with any of chromate treatment, zinc plating, and blast zinc coating treatment.
The present invention can also provide metal surface treatment agents and metal surface treatment methods, which provide anticorrosion coatings having extremely high adhesion to metal surfaces.
The present invention can provide metal surface treatment agents and metal surface treatment methods which can effectively protect the surfaces of metals such as iron, zinc, aluminum, copper, magnesium, etc., stainless steel, iron-zinc alloy, zinc-tin alloy, zinc-nickel alloy, brass, aluminum die cast, magnesium die cast, zinc die cast, and alloys of the above described metals.
Further, the present invention can provide metal surface treatment agents and metal surface treatment methods which can be favorably applied to surfaces of anticorrosion coatings formed by various methods such as electroplating, hot-dipping, plating without electrolysis, alloy plating, DACROTIZED® treatment (registered trademark), and blast zinc coating.
Corrosion resistant coating steel substrates, in which surfaces of the metal treated with various platings, such as electroplating, hot-dipping, plating without electrolysis, alloy plating, blast zinc coating treatment, etc., for example plated steel sheet, are treated with the metal surface treatment methods of the present invention, allow continuous electric resistance welding such as spot welding, seam welding. Since they excel in bending adhesion and post-bending corrosion resistance, they can be used as pre-coated steel sheets.
In one aspect, the invention is directed to a metal surface treatment agent intended to solve the above described problems which is characterized by containing, as a primary component, at least one kind of mercapto group-containing compounds selected from the following groups and further, optionally, containing at least one substituent selected from the group of curing agents, curing catalysts and silica:
(1) a mercapto group-containing compound (a) which is obtained by condensation from the esterification reaction of polyhydric alcohol having at least two or more hydroxyl groups per molecule and a mercapto group-containing acid compound having at least one or more mercapto groups per molecule and at least one or more carboxyl groups per molecule and also which has an equivalent weight of the mercapto groups in the range of 1 through 18 millimoles/g;
(2) a mercapto group-containing compound (b) which is obtained by condensation from the esterification reaction of polyhydric alcohol having at least two or more hydroxyl groups per molecule, a mercapto group-containing acid compound having at least one or more mercapto groups and at least one or more carboxyl group per molecule, and a polyacid compound having at least two or more carboxyl groups per molecule, and also which has an equivalent weight of the mercapto groups in the range of 1 through 18 millimoles/g;
(3) a mercapto group-containing compound (c) which is obtained by condensation from the esterification reaction of a hydroxyl group-containing resin having the hydroxyl value of 30 mg-KOH/g or greater and a mercapto group-containing acid compound having at least one or more mercapto groups per molecule and at least one or more carboxyl groups per molecule, and also which has an equivalent weight of the mercapto groups in the range of 1 through 18 millimoles/g; and
(4) a mercapto group-containing compound (d) which contains at least one or more mercapto groups and two or more cross-linking functional groups per molecule, and also which has an equivalent weight of the mercapto groups in the range of 1 to 18 millimoles/g.
In another aspect, the invention is directed to a method of treating metal surfaces characterized by including a coating forming process, in which metal surfaces are coated with the above described metal surface treatment agent, and a heat treatment process in which the metal surface treatment agent coating is heated.
In yet another aspect, the invention is directed to a pre-coated metal substrate characterized by having a cured coating which is formed on a plated surface of the metal substrate, treated with zinc or an alloy containing zinc in its composition, using a metal surface treatment agent described above and using a method of treating metal surfaces described above.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION
A method of treating metal surfaces of the present invention includes a coating forming process, in which metal surfaces are coated with the above described metal surface treatment agent, and a heat treatment process in which the metal surface treatment agent coating is heated.
Below, the above described coating formation process and heat treatment process are described in detail.
1. Coating Formation Process:
(1.1) Metal Surface Treatment Agents:
Examples of metal surface treatment agents used in the above described coating formation process are: compositions having, as a primary component, at least one kind of mercapto group-containing compounds selected from the following group; and compositions containing at least one kind of the mercapto group-containing compounds selected from the group of the mercapto group-containing compounds, (a), (b), (c) and (d) and at least one kind selected from the group of curing agents, and curing catalysts, and silica:
(1) a mercapto group-containing compound (a) which is obtained by condensation from the esterification reaction of polyhydric alcohol having at least two or more hydroxyl groups per molecule and a mercapto group-containing acid compound having at least one or more mercapto groups per molecul
Hosono Tetsuo
Inoue Tadayoshi
Nakazato Michiaki
Freer John J.
Jones Deborah
McNeil Jennifer
Metal Coatings International Inc.
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