External current

External current in connection with cathodic corrosion protection is a technique used in corrosion protection technology to protect metallic structures from unwanted corrosion. In this process, a protective voltage is generated by applying an external current, which puts the affected metal into a cathodic state.

In practice, this is achieved by introducing an external current into the corroded system. The metallic structure to be protected is connected to an electrically conductive layer or anode. This connection allows electrons from an external current source to flow into the structure to be protected. These electrical currents cause a cathodic reaction on the metal surface, which slows down or completely stops the natural corrosion process.

The use of impressed current in cathodic corrosion protection is particularly effective in environments where conventional protective agents such as sacrificial anodes or coatings are not sufficient. This process is often used in the maintenance of buried pipelines, marine facilities, underground tanks and other structural elements that are exposed to high corrosion risks.

The advantages of impressed current in cathodic corrosion protection lie in its precise controllability and its applicability in demanding environments. Through the targeted application of impressed current, corrosion protection can be tailored to specific conditions and requirements to ensure the long-term integrity of metallic structures.