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The main novelty of the device and procedure is the new portable sensor adaptable to virtually any surface. The device, fixable by vacuum to the surface under study, makes possible the measurement of the electrochemical interfacial impedance, that is the main parameter of interest for adherence quality and anti-corrosion performance.
Description of the technology
Paint coating is one of the most used methods to delay corrosion process in metallic structures. Metal corrosion is the main reason of metallic infrastructure deterioration (bridges, boats, planes…) causing failures in numerous industrial areas. The economic loss due to corrosion is estimated at about 4% of the Gross Domestic Product (GDP) in industrialized countries. Due to the serious consequences of this phenomenon, it is essential to develop effective methods for early detection of coatings failures and establishment of deterioration mechanisms. However nowadays, most of the inspection methods are indirect, destructive and based on deterministic or probabilistic models, which limits the coatings performance assessment in real operating conditions. The Corrosion Engineering and Materials Research Group (ENCOMAT) proposes a solution to this problem with a new device and a direct and non-destructive test based on electrochemical impedance spectroscopy (EIS).
Specifications
The device defines two concentric and nominally identical areas on the surface to be inspected. Those areas are put in contact with the electrolyte used for testing allowing for EIS measurements. The impedance data obtained, three consecutive measurements, are further numerically treated to extract the interfacial electrochemical impedance, which accounts for the ionic current circulation at the metal-coating interface, parallel to the metallic surface.
Main advantages of its use
Applications
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