Intended learning objectives.

By the end of this lecture, learners should understand the representation of corroding surfaces in terms of electrical currents, grasp the relationship between anodic and cathodic currents, and recognize the significance of the corrosion current. Additionally, they should comprehend the issue associated with directly measuring corrosion currents during free corrosion. Furthermore, learners should be familiar with the concept of a three-electrode cell and how it allows for the study of surface responses to applied external currents. Lastly, they should recognize the role of a potentiostat in automating experimental control and data collection in electrochemical corrosion studies.