Which type of cathodic protection provides a continuous current?

The type of cathodic protection that provides a continuous current is impressed current cathodic protection (ICCP). This method utilizes an external power source to supply a steady flow of electrical current, which protects metallic structures from corrosion by ensuring that the structure becomes the cathode in an electrochemical cell. The continuous current provided by the external source allows for better control over the protection levels and can be adjusted as needed, which is especially beneficial in environments where corrosion rates may vary.

ICCP systems are advantageous in preventing corrosion on large structures, such as pipelines or ships, where natural electrochemical reactions might not be sufficient to provide adequate protection. The ability to maintain a constant protective current differentiates ICCP from other methods, which may rely on passive or sacrificial processes that do not provide continuous electrical input.