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03006 SURFACE-TOLERANT, ALUMINUM-FOIL, TAPE COATING

A cyclic salt-fog test was used to characterize the corrosion control of various aluminum foil coatings on rusted steel. In the maintenance of minimally prepared steel in a marine atmosphere, a properly designed coating system, containing an aluminum foil layer, would be expected to be significantly more durable than a traditional liquid applied coating.

 

Product Number: 51300-03006-SG
ISBN: 03006 2003 CP
Author: R. J. Draper, R.D. Klassen, P.R. Roberge
Publication Date: 2003
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Aluminum foil coatings are applied by adhering a laminated film containing an aluminum foil layer to a steel substrate. Aluminum foil coatings are known to possess better barrier properties and provide better protection to corners (sharp edges) than conventional liquid applied coatings of similar film thickness. A cyclic salt-fog test was used to characterize the corrosion control behavior of various aluminum foil coatings applied to rusted steel. The test data showed that, in addition to controlling corrosion by a barrier mechanism, some of the foil coatings controlled the spread of corrosion at scribes and holidays by a cathodic protection mechanism. Rust creepage rate decreased as foil thickness increased. Most of the foil coatings outperformed the epoxy mastic coating that was used as a comparison. Adhering bare foil directly to a minimally prepared, rusted steel substrate resulted in rapid pitting and perforation of the foil; however pitting did not occur if an intermediate organic layer was present, between the foil and the rusted steel. In the maintenance of minimally prepared steel in a marine atmosphere, a properly designed coating system, containing an aluminum foil layer, would be expected to be significantly more durable than a traditional liquid applied coating of similar film thickness.

Keywords: surface tolerant coating, aluminum foil, tape, wrap, barrier coating, metallizing

Aluminum foil coatings are applied by adhering a laminated film containing an aluminum foil layer to a steel substrate. Aluminum foil coatings are known to possess better barrier properties and provide better protection to corners (sharp edges) than conventional liquid applied coatings of similar film thickness. A cyclic salt-fog test was used to characterize the corrosion control behavior of various aluminum foil coatings applied to rusted steel. The test data showed that, in addition to controlling corrosion by a barrier mechanism, some of the foil coatings controlled the spread of corrosion at scribes and holidays by a cathodic protection mechanism. Rust creepage rate decreased as foil thickness increased. Most of the foil coatings outperformed the epoxy mastic coating that was used as a comparison. Adhering bare foil directly to a minimally prepared, rusted steel substrate resulted in rapid pitting and perforation of the foil; however pitting did not occur if an intermediate organic layer was present, between the foil and the rusted steel. In the maintenance of minimally prepared steel in a marine atmosphere, a properly designed coating system, containing an aluminum foil layer, would be expected to be significantly more durable than a traditional liquid applied coating of similar film thickness.

Keywords: surface tolerant coating, aluminum foil, tape, wrap, barrier coating, metallizing

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