In cathodic protection systems, which quality is preferred for anodes?

In cathodic protection systems, the preferred quality for anodes is resistance to corrosion. This characteristic is crucial because the primary function of an anode in these systems is to provide a source of electrons to protect the cathodic material (often a pipeline or tank) from corrosion. If the anode itself is prone to corrosion, it would quickly deteriorate, reducing its effectiveness and also leading to potential failure of the cathodic protection system. Anodes must be made of materials that can withstand the corrosive environment while maintaining their structural integrity over time.

While factors such as corrosion potential, melting point, and weight may have relevance in different contexts, they do not directly address the core requirement for anodes in cathodic protection systems. The ideal anode material should be highly resistant to corrosion to ensure optimal performance and longevity in protecting the associated structures from electrochemical deterioration.