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The Correlation of Appearances of Appearances of Changes and Long term Corrosion Protection for Aromatic Polyurethane Coatings Used on Steel Water Pipes

The Correlation of Appearances of Appearances of Changes and Long term Corrosion Protection for Aromatic Polyurethane Coatings Used on Steel Water Pipes
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Aromatic polyurethane coatings are often used in the protection of steel water pipelines from corrosion. Unfortunately, pipeline sections may be stored above ground for many months before installation so the coatings yellow, lose gloss and can chalk. This deterioration in appearance naturally creates doubt about the corrosion protective qualities of the coatings.

Product Number: 51220-237-SG
Author: S. G. Croll, C. Gu, V. Upadhyay, B. D. Keil
Publication Date: 2020
Industry: Coatings
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$20.00
$20.00

Aromatic polyurethane coatings are often used in the protection of steel water pipelines from corrosion. Unfortunately, pipeline sections may be stored above ground for many months before installation so the coatings yellow, lose gloss and can chalk. This deterioration in appearance naturally creates doubt about the corrosion protective qualities of the coatings. A two year study of five such coatings exposed in Florida and Texas, as well as in accelerated weathering, established the kinetics of degradation. Color, gloss, albedo, coating thickness and corrosion protection (via electrochemical impedance spectroscopy) were monitored during these exposures. Despite the rapid loss in appearance, corrosion protection remained intact. There may be links between some properties such as the rate of thickness reduction and gloss loss, but the kinetics of corrosion protection failure is much more complicated. Coating parameters determining corrosion protection will be discussed as well as some of the problems involved in choosing experimental conditions to assess properly how those parameters might change.

Aromatic polyurethane coatings are often used in the protection of steel water pipelines from corrosion. Unfortunately, pipeline sections may be stored above ground for many months before installation so the coatings yellow, lose gloss and can chalk. This deterioration in appearance naturally creates doubt about the corrosion protective qualities of the coatings. A two year study of five such coatings exposed in Florida and Texas, as well as in accelerated weathering, established the kinetics of degradation. Color, gloss, albedo, coating thickness and corrosion protection (via electrochemical impedance spectroscopy) were monitored during these exposures. Despite the rapid loss in appearance, corrosion protection remained intact. There may be links between some properties such as the rate of thickness reduction and gloss loss, but the kinetics of corrosion protection failure is much more complicated. Coating parameters determining corrosion protection will be discussed as well as some of the problems involved in choosing experimental conditions to assess properly how those parameters might change.

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