Compared to an impressed current system, a galvanic anode system in soil has which of the following advantages?

A galvanic anode system, also referred to as a sacrificial anode system, operates by using the electrochemical potential difference between the anode and the structure it protects. One of its primary advantages is that it requires no external power sources. This self-sustaining aspect means that it can be ideal for remote locations or areas where power access is limited or unavailable, which can simplify installation and ongoing operations.

While maintenance costs in galvanic systems can sometimes be lower than in impressed current systems due to reduced complexity and fewer components, this is not universally true. Galvanic systems may have other complications related to anode replacement and monitoring. Furthermore, when considering efficiency in corrosion prevention, impressed current systems are often more adaptable and can provide a higher level of protection in challenging environments. Lastly, the lifespan of galvanic anodes tends to be shorter compared to some impressed current systems, which can be designed for longer service life. Hence, the advantage of requiring no external power stands out clearly for galvanic anode systems in soil applications.