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Substrate preparation which includes the removal of contaminates, abrading or etching to create a surface profile via mechanical or chemical methods have a major impact on the adhesion performance of applied coatings. For coatings, a primary performance characteristic is adhesion after exposure to corrosive environments. One of the consequences of corrosion forming under a coating is the loss of adhesion or delamination of the coating.
Substrate preparation which includes the removal of contaminates, abrading or etching to create a surface profile via mechanical or chemical methods have a major impact on the adhesion performance of applied coatings. For coatings, a primary performance characteristic is adhesion after exposure to corrosive environments. One of the consequences of corrosion forming under a coating is the loss of adhesion or delamination of the coating. We used electrochemical impedance spectroscopy (EIS) along with accelerated exposure tests (ultraviolet light cycling with condensation, salt-spray) to determine the influence of corrosion inhibitors on the adhesion of direct-to-metal topcoats.
Modern design, manufacturing and field-testing specifications include surface profile and adhesion testing on the assumption that they are linked to long term corrosion prevention. There are a number of careful studies, dating back decades, that find no link between measurements of adhesion and (undercutting) corrosion performance, but other studies do, and the concept remains intuitively appealing and widely assumed.
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Fiber-Reinforced Polymers (FRP) materials are used to rehabilitate and strengthen structures systems and components including but not limited to concrete bridges, columns, marine piers, metallic and concrete pipes, metallic and concrete piles, parking garages, and even storage tanks structures. The growing appeal of this rehabilitation process consists of two primary purposes; to increase shear and load capacity and repair and prevent corrosion degradation.
Details of a new protocol for evaluating the effectiveness of coatings to reduce corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) standards and recent research investigations were used to develop a procedure that can provide conclusive results within 2400 hours of exposure as compared to more than 5000 hours in current practices.