Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Reexamination Certificate
2001-02-20
2002-11-26
Green, Anthony J. (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
C106S014210, C106S014410, C427S388100, C427S388400
Reexamination Certificate
active
06485550
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a self-sacrifice type metal corrosion inhibitor for the corrosion proof treatment of the surface of the metal such as iron or iron alloy and a metal corrosion inhibiting method using said self-sacrifice type metal corrosion inhibitor.
DESCRIPTION OF THE PRIOR ART
Hitherto, a metal corrosion inhibitor comprising a metal powder having a greater ionization tendency than that of a metal to be treated such as zinc powder or aluminum powder in a case where said metal to be treated is iron or iron alloy, chromium (VI) source such as chromate and the like, pH adjusting agent such as metal oxide, metal hydroxide and the like, reducing organic compound such as low molecular oxohydroxy ether and the like, and water soluble solvent has been provided.
Said traditional metal corrosion inhibitor is adhered to the surface of a metal to be treated and chromium (VI) from said chromium (VI) source may be reduced by said reducing organic compound to chromium (III) to sedimentate on the surface of said metal to be treated by heating and said metal powder is adhered to, and fixed on the surface of said metal to be treated through said chromium (III) layer as an adhesive layer to form a metal corrosion inhibiting layer.
Hitherto, zinc-electro plating, zinc-mechanical plating and zinc-mechanical galvanized, zinc-melting plating and the like have been also used for the metal corrosion inhibiting treatment.
Said traditional metal corrosion inhibitor contains chromium (VI) source and in said zinc-electro plating, zinc-mechanical plating and zinc-mechanical galvanized, zinc-melting plating and the like also chromium (VI) is used to improve the metal corrosion inhibiting property. Nevertheless, said chromium (VI) is poisonous and it becomes difficult to use said chromium (VI) considering environmental contamination. Further said zinc-mechanical plating and zinc-mechanical galvanized has a problem of noise so that the advert of a self-sacrifice type metal corrosion inhibitor has been desired. Said self-sacrifice type metal corrosion inhibitor may contain no poisonous component and cause no public nuisance and no noise while said self-sacrifice type metal corrosion inhibitor has a metal corrosion inhibiting property equal to the traditional metal corrosion inhibitor containing chromium (VI) source.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a self-sacrifice type metal corrosion inhibitor causing no public nuisance and no noise.
Another object of the present invention is to provide a self-sacrifice type metal corrosion inhibitor having a metal corrosion inhibiting property equal to the traditional metal corrosion inhibitor containing chromium (VI).
Briefly, said objects of the present invention can be attained by a self-sacrifice type metal corrosion inhibitor comprising;
one or more kind(s) of metal powder having a greater ionization tendency than that of a metal to be treated, water insoluble thermoplastic resin powder, water soluble anticorrosion agent, surface active agent, thickener and water; and
a metal corrosion inhibiting method comprising; preparing a treatment solution by dispersing said metal powder having a greater ionization tendency than that of said metal to be treated and said water insoluble thermoplastic resin powder in water containing said water soluble anticorrosion agent, said surface active agent and said thickener, adhering said treatment solution to the surface of said metal to be treated, heating said metal to be treated to melt said thermoplastic resin powder and form a thermoplastic resin layer fixed on the surface of said metal to be treated, and forming a metal corrosion inhibiting layer on the surface of said metal to be treated by fixing said metal powder on the surface of said metal to be treated through said thermoplastic resin layer as an adhesive layer; and further
a metal corrosion inhibiting method comprising; a treatment solution by dispersing said metal powder having a greater ionization tendency than that of said metal to be treated and said water insoluble thermoplastic resin powder in water containing said water soluble anticorrosion agent, said surface active agent and said thickener, adhering said treatment solution to the surface of said metal to be treated, heating said metal to be treated to melt said thermoplastic resin powder and form a thermoplastic resin layer fixed on the surface of said metal to be treated, and forming a metal corrosion inhibiting layer on the surface of said metal to be treated by fixing said metal powder on the surface of said metal to be treated through said thermoplastic resin layer as an adhesive layer; and further treating with a mixture of polymer and/or oligomer and Na
2
O:nSiO
2
(n=3 or 4) as a self-restoring agent for the self-sacrifice type corrosion inhibiting property of said metal corrosion inhibiting layer wherein said polymer and/or oligomer is(are) one or more polymer or oligomer selected from a group consisting of poly (meth)acrylic acid, copolymer of (meth)acrylic acid and other vinyl monomer which can be copolymerized with (meth)acrylic acid, (meth)acrylic acid oligomer, and oligomer consisting of (meth)acrylic acid and other vinyl monomer which can be copolymerized with (meth)acrylic acid.
In a case where said metal to be treated is iron or iron alloy, zinc powder or aluminum powder or zinc-aluminum alloy powder is preferably used.
In said metal corrosion inhibitor of the present invention, said metal powder and said water insoluble thermoplastic resin powder are stably dispersed in water containing said water soluble anticorrosion agent, said surface active agent and said thickener.
When said treating solution is adhered on the surface of said metal to be treated and heated, said water insoluble thermoplastic resin is melted to adhere the surface of said metal to be treated and a metal corrosion inhibiting layer is formed. In said metal corrosion inhibiting layer, said thermoplastic resin powder maintains powder form since said thermoplastic resin powder is insoluble in water, the resulting thermoplastic resin layer on the surface of said metal to be treated has a porous structure. Accordingly said metal corrosion inhibiting layer consisting of said metal layer which is fixed on the surface of said metal to be treated by said thermoplastic resin layer also has a porous structure, and as a result said metal corrosion inhibiting layer becomes an electroconductive layer having a low electric resistance and a desirable electric resistance on the surface of said metal to be treated is guaranteed.
Further when said treated metal is further treated with a mixture of polymer and/or oligomer and Na
2
O:nSiO
2
(n=3 or 4) as a self-restoring agent for the self-sacrifice type corrosion inhibiting property of said metal corrosion inhibiting layer wherein said polymer and/or oligomer is(are) one or more polymer or oligomer selected from a group consisting of poly (meth)acrylic acid, copolymer of (meth)acrylic acid and other vinyl monomer which can be copolymerized with (meth)acrylic acid, (meth)acrylic acid oligomer, and oligomer consisting of (meth)acrylic acid and other vinyl monomer which can be copolymerized with (meth)acrylic acid, to form an organo silicate compound layer on said metal corrosion inhibiting layer, a self-restoring property equal to or higher than that of zinc-chromate treatment layer is given to said metal corrosion inhibiting layer.
Said treatment solution consisting of only nonpoisonous components contains no poisonous component such as chromium (VI) source and the like.
DETAILED DESCRIPTION
[Metal powder]
Metal powder used in the present invention consists of a metal having a greater ionization tendency than that of a metal to be treated and in a case where said metal to be treated is iron or iron alloy, said metal powder may be zinc powder, aluminum powder, zinc-aluminum alloy powder and the like. The purity of said metal powder is preferably higher than 99.0% by weight, more pre
Cooper & Dunham LLP
Dowden Donald S.
Green Anthony J.
Toyographoile Ltd.
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