What are E log I (Evans diagrams) curves used for?

Evans diagrams, also referred to as E-log I curves, are crucial tools in the study of electrochemistry and corrosion. They are specifically designed to illustrate the relationship between the electric potential (E) and the current density (I) in an electrochemical cell. This graphical representation is fundamental in understanding how polarization affects corrosion behavior, including the activation and concentration polarization of metals in various environments.

The curves provide insights into how the potential applied affects the corrosion rates of different materials, thus allowing for a comprehensive analysis of how various factors interact in electrochemical reactions. By analyzing the shape and position of these curves, one can deduce vital information about the kinetics of corrosion processes, the protective effects of coatings, and the overall stability of materials under different electrical conditions. This understanding is essential for effective corrosion management and prevention strategies.