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Field Testing – The Correlation Between Accelerated Laboratory Tests and Field Testing

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All protective coatings are thoroughly tested using accelerated laboratory tests. Accelerated testing has the advantage of providing data and results in a relatively short timeframe and the conditions of testing are pre-defined and controlled throughout the test. However accelerated testing also has disadvantages. Accelerated testing at e.g. tougher environmental conditions or higher temperatures may give different degradation mechanisms than at in service conditions.Field exposures can be used as a supplement to accelerated testing and can be utilized as a verification of the test setup.In this paper results from several atmospheric accelerated laboratory exposure tests for numerous protective coating systems have been compared to results obtained from up to nine years of field exposure testing in a marine environment corresponding to corrosion category C5 according to ISO 12944-2.The comparison shows varying correlation between accelerated laboratory tests and field exposures. This indicates that high performance of a coating system during accelerated laboratory testing is not necessarily predictive for high long term performance under in-service conditions. Potentially causing premature coating failures under in service conditions.The authors therefore propose ailormade test scheme for the various generic coatings and the in-service conditions and for the industry to accept a more holistic view on coating performance.

Product Number: 51319-13154-SG
Author: Anders W. B. Skilbred
Publication Date: 2019
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Evaluation of metal-based structures has relied on atmospheric exposure test sites to determine corrosion resistance in marine environments. This work uses surface chemistry and electrochemical techniques to interpret the chemical changes occurring on low carbon and stainless steel during atmospheric and accelerated corrosion conditions to find a correlation between its accelerated and long-term corrosion performance.
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Accelerated Offshore Coating Performance Testing

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ISBN: 9134 2017 CP
Author: Benjamin Chang
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Offshore is a very corrosive environment with a high corrosion rate. The offshore coating service life is relatively short and extremely expensive to apply maintenance coatings onsite.  A new accelerated coating corrosion test method is proposed.
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