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Cast iron is a material that is commonly used for drainage pipe systems, but when it is exposed to an aggressive medium, it is subject to electrochemical corrosion [1, 2]. Appropriate coating systems are used for this purpose. The surface of the coating was analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Corrosion electrochemical behavior of epoxy coating in 3.5 wt.% NaCl solution were studied by electrochemical impedance spectroscopy (EIS) and with scanning electrochemical microscopy (SECM). The aim of the work is to learn about the working mode of the SECM device by monitoring the corrosion resistance of epoxy coating. EIS measurements were performed in 3.5% NaCl. SECM has been introduced to evaluate the localized corrosion process, as it provides electrochemical activity and topographic information about the surface reactions at the micrometer scale in aqueous environments [3]. Therefore, two methods of measuring the corrosion resistance of epoxy coatings are compared and the possibilities provided by SECM compared to the classical EIS method are listed. Furthermore, the physical properties such as color, thickness, hardness, and adhesion to the cast iron surface were tested as well. The test results showed that the physical properties of epoxy coatings were satisfactory in the neutral medium, but electrochemical tests showed a reduced corrosion protection.
corrosion ; epoxy coatings ; nanoparticles ; electrochemical impedance spectroscopy ; scanning electrochemical microscopy
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