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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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Test specimens, methods, and equipment have been presented that will be used for the development of a representative, accelerated test protocol to accurately reproduce multi-layer coating failure modes resulting from the combination of environmental and mechanical stressors.
Aluminum alloys exhibit good resistance to atmospheric corrosion due to the presence of a fine, passive oxide layer. Nevertheless, these alloys are not immune to corrosion which can take the form of localized corrosion like pitting, intergranular or exfoliation corrosion. Thus, the assessment of the corrosion behavior of aluminum alloys under atmospheric conditions is a major topic for many applications including the aerospace industry.
This group of authors, thinking outside the proverbial box, and with a mind to Shakespeare’s Macbeth, presented a paper at SSPC 2010 entitled “Hubble, Bubble, Tests and Trouble: The Dark Side of Misreading the Relevance of Coating Testing”. A challenge to the status quo of coatings performance testing, the paper boldly questioned much of the conventional wisdom surrounding coating testing and how that testing is interpreted.
Previous papers by two of the authors have examined 1) the futility of attempting to correlate accelerated corrosion testing results to real world corrosion observations, and 2) how corrosion testing is useful as an indicator of performance without the need for real world correlation and what may be expected in a corrosive environment and how these results can be usefully applied in the real world. This third paper in the trilogy, examines a specific attribute of accelerated corrosion testing, that being the utility of wet/dry cycling testing versus continuous fog methods.
Accelerated corrosion test methods are regularly utilized in coating industries to predict the performance of coatings in real life exposure. The performance of coatings in these accelerated tests is a key step in the product development cycle. It is essential to understand different factors that may introduce variability in the test result.