What type of metal is installed in the ground and connected to a submersible transformer's tank to prevent corrosion?

The use of a sacrificial anode is a well-established method for preventing corrosion, particularly in metal structures such as a submersible transformer's tank that are installed in the ground or submerged in water. Sacrificial anodes are made from a metal that is more reactive than the metal of the structure they are protecting. When buried or submerged, the sacrificial anode corrodes preferentially, which protects the transformer tank from corrosion.

When the sacrificial anode corroded, it releases electrons that protect the cathodic areas of the structure, effectively slowing down the corrosion process. This technique is widely used in various applications, including pipelines, boats, and transformers, to extend the life of metal components that might otherwise degrade due to the harsh environment they are placed in.

In contrast, rebar, stainless steel, and aluminum do not serve the same purpose in this context. Rebar is typically used for structural reinforcement in concrete and does not inherently prevent corrosion in the same way as a sacrificial anode. Stainless steel is resistant to corrosion but is not designed to corrode instead of another material. Aluminum, while it has good corrosion resistance properties, would not be used in the same context as a sacrificial anode to protect another