Intended learning objectives.

By the end of this lecture, learners should understand how the kinetics of anodic and cathodic reactions influence the corrosion potential and corrosion current density in materials undergoing corrosion under activation control. They should grasp the concept that the presence of cathodically active phases can lead to increased cathodic activity, resulting in higher corrosion rates and higher corrosion potentials. Learners should also recognize that the corrosion potential alone is not a direct indicator of corrosion rate when comparing materials corroding independently, emphasizing the importance of considering specific kinetic factors to assess relative corrosion susceptibility. Additionally, they should be aware of the concept of galvanic corrosion, where electrical connections between materials can accelerate corrosion on the material with the lower corrosion potential.