Cathodic Protection Tester Practice Exam

What happens when the anodes in a cathodic protection system age?

1. They become more efficient

2. Resistance increases

3. They may lose mass

4. They require less maintenance

The correct answer is: They may lose mass

As anodes in a cathodic protection system age, they can experience a reduction in mass due to the electrochemical reactions that occur as they serve their protective function. The primary role of the anode is to corrode preferentially, thereby protecting the cathode (the structure being protected) from corrosion. This sacrificial process involves the anode sacrificing its material over time, which leads to the loss of mass. This mass loss is a normal part of the anode's operation and an important indicator that the cathodic protection system is functioning properly. Monitoring the condition of the anodes helps ensure effective corrosion protection of the system being safeguarded. Over time, if the anodes lose too much mass, they may become ineffective, which is why regular inspection and maintenance are essential to the longevity and efficiency of the cathodic protection system.