What are the two systems of cathodic protection?

What are the two systems of cathodic protection?

• A. Galvanic and repressed current
• B. Galvanic and impressed current
• C. Galvanic and reversed current
• D. Galvanic and induced current

Answer: (B)

The correct answer is B because the two recognized systems of cathodic protection are galvanic and impressed current systems. Galvanic cathodic protection uses sacrificial anodes made of more reactive metals, which corrode instead of the protected metal structure, creating a natural flow of current. These anodes are connected electrically to the structure that needs protection and function effectively in environments with adequate electrolyte. On the other hand, impressed current cathodic protection relies on an external power source to provide a continuous flow of protective current. It employs inert anodes and can be adjusted in terms of output to suit the specific conditions and requirements of the application. This system is often used for larger structures or in situations where galvanic systems would not be efficient. The options involving 'repressed current', 'reversed current', and 'induced current' do not correspond to recognized methods of cathodic protection, which clarifies why they are not valid answers. Understanding these two primary systems is crucial for effective corrosion control and maintenance of aboveground storage tanks, ensuring their operational longevity and safety.

The correct answer is B because the two recognized systems of cathodic protection are galvanic and impressed current systems.

Galvanic cathodic protection uses sacrificial anodes made of more reactive metals, which corrode instead of the protected metal structure, creating a natural flow of current. These anodes are connected electrically to the structure that needs protection and function effectively in environments with adequate electrolyte.

On the other hand, impressed current cathodic protection relies on an external power source to provide a continuous flow of protective current. It employs inert anodes and can be adjusted in terms of output to suit the specific conditions and requirements of the application. This system is often used for larger structures or in situations where galvanic systems would not be efficient.

The options involving 'repressed current', 'reversed current', and 'induced current' do not correspond to recognized methods of cathodic protection, which clarifies why they are not valid answers. Understanding these two primary systems is crucial for effective corrosion control and maintenance of aboveground storage tanks, ensuring their operational longevity and safety.