What is a characteristic feature of mixed metal oxide anodes?

Mixed metal oxide (MMO) anodes are designed with a particular set of materials and properties that make them effective in a variety of cathodic protection applications. A distinguishing characteristic of MMO anodes is their resistance to acid attack. This property arises from the composition of the anodes, as they are often coated with oxides such as titanium oxides, which provide exceptional stability and durability under acidic conditions.

This acid resistance allows MMO anodes to perform reliably in environments where many other types of anodes might deteriorate, thus extending their service life and reducing maintenance needs. This property is crucial in many cathodic protection scenarios, particularly in marine and industrial environments where the risk of acid exposure is prevalent.

While other options may discuss aspects related to anodes' performance, they do not capture this essential feature that sets mixed metal oxide anodes apart in terms of durability and longevity in corrosive conditions.