Abstract
This chapter addresses the question of whether ions and water penetrate the coating via discrete channels or as a uniform diffusion front. It examines some of the new research tools that are being implemented to answer these questions. It focuses on the idea of whether water and ions move through contiguous organic coatings via intrinsic localized pathways. The chapter presents electrochemical methods for the local characterization of coatings. A variety of DC and AC methods have been developed in for the in situ examination of local electrochemical events. Some of these methods include: scanning reference electrode techniques, scanning vibrating probes, Kelvin probes, and electrochemical microscopy. There are topographic methods, such as atomic force microscopy, that can be used to investigate the surface morphology as opposed to electrochemical information. It discusses local electrochemical impedance map (LEIM) and local electrochemical impedance spectra (LEIS) for the local characterization of coatings.
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