Aqueous gel compositions and use thereof

Details Aqueous gel compositions and use thereof Aqueous gel compositions and use thereof

1999-09-10

2001-10-30

Sheehan, John (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S251000, C106S014210, C252S389300, C252S400300

Reexamination Certificate

active

06309478

ABSTRACT:

FIELD OF THE INVENTION
The instant invention relates to aqueous-based gels and, in some cases, usage of such gels to impart corrosion resistance, for example, to steel or zinc containing surfaces, e.g., galvanized steel. The gel comprises water, at least one thickener, at least one inorganic material and an optional surfactant.
BACKGROUND OF THE INVENTION
The corrosion of steel and other metal containing products continues to be a serious technical problem which has profound effects on the economy. Corrosion causes loss of natural resources, and deteriorates key infrastructure such as roads and buildings. It also causes premature replacement of equipment and parts in industrial facilities, boats and other marine vehicles, automobiles, aircraft, among a wide range of metallic components.
Current industry standards for corrosion prevention center around the use of barrier coatings, sacrificial coatings, alloys containing heavy metals such as chromium, nickel, lead, cadmium, copper, mercury, barium, among other heavy metals. The introduction of these materials into the environment, however, can lead to serious health consequences as well as substantial costs to contain or separate the materials or clean up environmental contamination. Damage associated with corrosion, accordingly, is a continuing problem and better systems for preventing corrosion are still needed.
SUMMARY OF THE INVENTION
The instant invention solves problems associated with conventional technologies by providing an aqueous based gel which can protect metals from corrosion in a manner that is compatible with the environment, non-flammable and cost-effective.
The aqueous gel comprises or consists essentially primarily ocwater. The gel comprises water, at least one thickener, at least one silicate containing material and an optional surfactant. In some cases, the thickener may interact with one or more of the gel components and/or the metal surface, e.g., to form a metal substrate-thickener bond such as a zinc-organo product. e.g. zinc organo carboxylate. The gel can also include other components so long as these components do not adversely impact the viscosity or corrosion protection capabilities of the gel.
The gel can be prepared by using conventional methods and technologies. The gel can be applied or coated upon a metal containing surface by using any expedient method such as aerosol spray, dipping, painting, among other suitable conventional methods. In one aspect of the invention, the coating method can be enhanced by applying an electrical current or other suitable source of energy. Depending upon the thickness of the coating and surrounding environment, the inventive gel can protect a metal surface from corrosion, e.g., salt water spray. If desired, the inventive gel can be employed as relatively temporary coating upon a metal surface.


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