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Effect Of Steel Surface Profile Peak Density On Rust Creepage

The spread of disbondment or corrosion from a scribe or holiday in a coating film, for which the terms rust creepage or undercutting are used in this paper is an important mechanism of coating degradation. The mechanism of rust creepage has been well studied by several authors who concur that the mechanism is driven by electrochemical reactions15. The reactions occurring at the discontinuity in the coating (scribe or holiday) involve an anodic reaction in which iron is dissolved. Adjacent to the anodic region, under the coating, a cathodic reaction occurs in which oxygen is reduced to hydroxyl ions.

Product Number: 51322-17584-SG
Author: Russell Draper, Michael Beamish
Publication Date: 2022
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Rust creepage or undercutting from a discontinuity in a coating film, such as scribe or holiday, is an important mode of coating degradation on steel substrates. The mechanism of rust creepage is attributed to cathodic disbondment. This paper describes an experimental study of the influence of steel substrate topography, measured with a digital replica tape reader, on rust creepage. For the two coating systems that were studied, it was found that rust creepage was strongly inversely correlated with substrate peak density.

Rust creepage or undercutting from a discontinuity in a coating film, such as scribe or holiday, is an important mode of coating degradation on steel substrates. The mechanism of rust creepage is attributed to cathodic disbondment. This paper describes an experimental study of the influence of steel substrate topography, measured with a digital replica tape reader, on rust creepage. For the two coating systems that were studied, it was found that rust creepage was strongly inversely correlated with substrate peak density.

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