Abstract
The significance of using electrochemical methods is that the corrosion process is continuously monitored over the period of the relatively brief exposure time. The electrochemical characterization of materials is frequently carried out using the potentiodynamic polarization (PDP) method. A current is passed through the electrolyte in the potentiodynamic polarization process to modify the electrode’s potential at a predetermined rate. This technique can be used to determine values for several parameters, including corrosion current density, corrosion potential, corrosion rate, Tafel slope, polarization resistance, etc. From a thermodynamic and a kinetic viewpoint, respectively, the obtained values of corrosion potential and corrosion current density provide knowledge about the behavior of materials in corrosion environments. The benefit of this technology may be seen in the potential for localized corrosion detection, the simplicity and speed with which the corrosion rate can be calculated, the effectiveness of the corrosion protection, etc. The theory underlying this method is briefly described in this chapter, along with methods for deriving useful information from polarization scans.
Published Version
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