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Predicting the Enhanced Effects of Coating Deterioration in Marine Environments

Organic coatings are the most used method of corrosion prevention and protection of metallic substrates
in many industries. Owners in both the public and private sectors will invest significant resources into
testing coating options to provide the best protection for new and existing products or infrastructure.
Often, this testing defaults to some variation of accelerated salt spray testing or outdoor marine exposure
with results being based on aspects such as visual measurements of rust through, corrosion
creepage/undercutting, and blistering.

Product Number: 51323-19341-SG
Author: Michael Kibler, James Ellor
Publication Date: 2023
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This paper reviews the theory of coating deterioration mechanisms and how these mechanisms are
connected to the common test method of scribe underfilm corrosion creep. Historical corrosion creepage
test data of marine coating performance in different environments is analyzed. This data is used to predict
the effects of coating deterioration in marine environments as compared to rural. This analysis is used to
discuss the merit of using underfilm corrosion creep of scribed panels as a coating performance indicator.

This paper reviews the theory of coating deterioration mechanisms and how these mechanisms are
connected to the common test method of scribe underfilm corrosion creep. Historical corrosion creepage
test data of marine coating performance in different environments is analyzed. This data is used to predict
the effects of coating deterioration in marine environments as compared to rural. This analysis is used to
discuss the merit of using underfilm corrosion creep of scribed panels as a coating performance indicator.

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