Impressed current anodes are known for having what type of service life?

Impressed current anodes are designed for long service life due to their operational characteristics and the way they function in corrosion prevention. These anodes are continually supplied with an external electrical current, which allows them to provide a consistent level of protection against corrosion, typically for extended periods.

The longevity of impressed current anodes can be attributed to several factors: the materials used in their construction are often resistant to corrosion themselves, and they can be engineered to maintain effective levels of cathodic protection for many years. Furthermore, the ability to adjust the current helps to prolong their effectiveness and mitigate wear and tear that could shorten service life.

In contrast, options that suggest a short or limited service life do not accurately reflect the nature of these anodes. While all anodes will eventually require replacement, impressed current anodes typically outperform sacrificial anodes in terms of lifespan due to their consistent and reliable mechanism of delivering protective current. Thus, the answer indicating a long service life aligns with the practical usage and longevity observed in marine corrosion prevention systems.