Which method is typically used to provide corrosion protection for large surfaces like pipelines?

The Impressed Current Protection System (ICPS) is widely recognized for providing effective corrosion protection for large surfaces, such as pipelines. This method involves using an external power source to drive a protective current to the pipeline. By doing so, it suppresses the electrochemical reactions that lead to corrosion. Anodes, often made from materials with a high driving potential, are strategically placed to distribute the current evenly over the surface, thereby enhancing protection.

ICPS is particularly suitable for extensive structures because it can cover a large area more effectively than other methods. It is also adjustable; the current can be modified according to specific environmental conditions or changes in the condition of the pipeline. This adaptability makes it a preferred choice for infrastructure such as oil and gas pipelines, which require reliable and long-lasting corrosion protection.

While the other methods listed have their merits and can be used in various contexts, they generally do not provide the same level of comprehensive protection offered by ICPS for large surfaces. For example, the sacrificial anode method relies on materials that corrode instead of the pipeline, which may not be as effective over extensive areas. Corrosive coating provides a barrier but may not withstand all environmental factors over time. Physical enclosures might not always be feasible or practical