Abstract
Organic coatings are applied as a corrosion prevention measure, but their effectiveness may degrade over time. In this study, the acceleration effects of typical degradation methods in non-defective vinyl ester resin organic coatings containing glass flakes such as high-temperature immersion and immersion in chemical accelerators are clarified using physiochemical techniques. Immersion in an acetic acid (AcOH) aqueous solution causes resin swelling, and the behaviors are quantitatively evaluated through gravimetric, thickness, and electrochemical impedance spectroscopy (EIS) measurements. Furthermore, a combined process of immersion in hydrofluoric acid and an AcOH aqueous solution reduces the electrical properties and eventually blisters the thick coating surface. This result suggests that an appropriate combination of the resin swelling and the glass degradation (glass dissolution and/or formation of the gap between glass and resin) decrease mechanical properties of the glass flake coating and causes blisters. In order to help the health diagnosis of the visually non-defective aged glass flake coating, the relationship between the electrical characteristic values and the invisible degradation by accelerated tests is finally indicated.
Highlights
Organic coatings are applied as corrosion prevention countermeasures for various large-scale steel structures in harsh environments
An appropriate accelerated degradation test, which reproduces blisters within a reasonable timescale is necessary to estimate the lifetime via laboratory experiments
Various accelerated degradation methods were employed for realizing blisters of vinyl ester resin organic coating containing glass flakes and their effects were evaluated
Summary
Organic coatings are applied as corrosion prevention countermeasures for various large-scale steel structures in harsh environments. The inner steel surface of its bottom plate, which is constantly exposed to an electrolyte solution containing chloride and other aggressive ions [1], is highly susceptible to corrosion damage. It requires efficient countermeasures, the bottom plate is inaccessible once the tank is filled with crude oil. Vinyl ester resin organic coatings containing glass flakes are often used to isolate inner surfaces of steel plates from a corrosive electrolyte solution. Aging degradation may reduce the anti-corrosion performance of glass flake coatings due to the lack of maintenance over a few decades
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