What are sacrificial anodes usually made of?

Sacrificial anodes are primarily made of Zinc or Magnesium because these materials exhibit a higher electrochemical potential than steel or other metals typically used in tank construction. When placed in contact with the steel of an underground storage tank, these anodes serve to corrode preferentially, protecting the tank from corrosion. This process is known as cathodic protection.

Zinc is often used for its excellent corrosion resistance, while magnesium is particularly effective in specific environments, such as soil with high resistivity. The effectiveness of sacrificial anodes relies not only on the material's ability to corrode but also on the compatibility of the metal with the environment in which the UST is located. The choice of Zinc and Magnesium allows for optimized performance in protecting against the corrosive effects of the environment surrounding the UST.

Understanding the importance of using the right materials for sacrificial anodes is crucial for ensuring the longevity and safety of underground storage tanks.