What is the most common type of concentration cell corrosion called?

The correct answer identifies crevice corrosion as the most common type associated with concentration cells. Crevice corrosion occurs in areas where there is a localized depletion of oxygen, which often happens in small, confined spaces, or crevices between two surfaces, such as the joints of metal components. This localized condition leads to variations in the electrochemical potential, effectively creating a concentration cell.

In these crevices, the electrolyte may become stagnant, allowing for the formation of a more acidic environment, which accelerates metal dissolution and results in rapid corrosion. This type of corrosion typically affects stainless steels and other alloys when exposed to seawater or other aggressive environments.

Understanding the mechanism of concentration cells is crucial because it highlights the factors that make certain areas of equipment more susceptible to corrosion, particularly where there may be reduced fluid flow or access to oxygen. Recognizing these conditions can inform better design choices and preventive measures in engineering applications.