Method for applying a polymer coating to a substrate

a technology of polymer coating and substrate, applied in the direction of coatings, liquid surface applicators, etc., can solve the problems of substrate corrosion and surface may need to be roughened, and achieve the effects of improving corrosion resistance coating, eliminating voids, and eliminating free volume voids

Inactive Publication Date: 2002-07-02
AIR FORCE GOVERNMENT OF THE US SEC THE THE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

An additional advantage of the invention is substantial elimination of voids in the sprayed coating resulting from the momentum of impact from the velocity sprayed powder particles. Adsorption of water within thermal sprayed powder coatings is avoided by the elimination of free volume voids. The free volume in conventional coatings results from evaporation of solvents, condensing coatings with random voids, condensation chain extensions of oligomers with random voids, or cross-linking with random residual voids.
It is therefore a principal object of the invention to provide an improved corrosio

Problems solved by technology

However, the polar bonds represent a weakness in the coating of potentially allowing adsorption and transport of water and dissolved ions to the substrate and consequent corrosion of the substrate.
Because non-polar polymers do not usually adh

Method used

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  • Method for applying a polymer coating to a substrate
  • Method for applying a polymer coating to a substrate
  • Method for applying a polymer coating to a substrate

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Embodiment Construction

Referring now to FIG. 1, shown therein is an illustration of the disbandment of a polar polymer from the substrate from acid / base substitutions and / or chemical degradation, such as saponification process of a polar polymer coating and rapid further subsequent migration, absorption and undercutting of the coating by water and its contained chemical ions when driven by the accompanying created oxygen starvation galvanic corrosion potential cell activity. Contact of the polar polymer coating 11 with water 13 and its contained ions can result in the degradation of the polymer which may result in eventual contact of the water 13 and its contained ions with substrate 15 and undercutting and separation 17 of coating 11 from substrate 15. Severe corrosion of substrate 15 by water and its contained ions may then result. Water 13 with sufficient ion content at high enough pH could chemically degrade the polymer coating 11.

Referring now to FIG. 2, shown therein is an example non-polar polymer ...

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Abstract

Corrosion resistant non-polar polymer coatings and method for applying the coatings to substrates is described, wherein a source of non-polar polymer powder is deposited as a coating onto the surface of a substrate by high temperature thermal spray, wherein the non-polar character of the powder and any additives thereto is substantially preserved during the high temperature thermal spray by using a mixture of a non-oxidizing shielding gas or reducing gas, or combination of the two, at one or more locations along the thermal spray to displace or react with ambient oxygen.

Description

BACKGROUND OF THE INVENTIONThe present invention relates generally to corrosion resistant coatings for metallic or nonmetallic substrates, and more particularly to novel non-polar or non-polarizable polymer corrosion resistant coatings and system and method for applying the coatings.Conventional corrosion control or prevention coatings for metallic substrates typically use polar polymers in order to enhance adhesion to the substrate. However, the polar bonds represent a weakness in the coating of potentially allowing adsorption and transport of water and dissolved ions to the substrate and consequent corrosion of the substrate.The invention solves or substantially reduces in critical importance the problems with corrosion resistant polymer coatings in the prior art wherein non-polar and preferably also non-polarizable polymer powders are deposited by high temperature thermal and impact energy spray or plasma spray process as coatings for corrosion protection for metallic substrates....

Claims

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Application Information

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IPC IPC(8): B05D1/10B05D1/08
CPCB05D1/10
Inventor HALLIWELL, MICHAEL J.
Owner AIR FORCE GOVERNMENT OF THE US SEC THE THE
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