Which two types of cathodic protection does the Navy utilize?

The Navy utilizes two main types of cathodic protection: Impressed Current Cathodic Protection (ICCP) and sacrificial anodes. ICCP systems involve the use of an external power source to provide a continuous flow of electrical current to the metal structures being protected. This current counteracts the electrochemical reactions that cause corrosion. On the other hand, sacrificial anode systems use more reactive metals that corrode preferentially to protect the underlying structure. By attaching these anodes to the structure, they sacrifice themselves to corrosion, protecting the more valuable components.

This combination of ICCP and sacrificial anodes is effective in various marine environments because each system addresses different corrosion scenarios. ICCP can be used in larger or more complex structures where a controlled and continuous current is necessary, while sacrificial anodes are useful in less complex situations or as a backup to the primary system. Together, these methods help maintain the integrity of naval vessels and underwater structures in saltwater environments.