Question

Which of the following is/are the types of cathodic protection?

(a) External impressed current supply

(b) Sacrificial anode

(c) External impressed current supply and sacrificial anode

(d) Neither external impressed current supply nor sacrificial anode

This question was posed to me by my college director while I was bunking the class.

This key question is from Cathodic and Anodic Protection in chapter Corrosion Prevention of Corrosion Engineering

Answer 1

The correct option is (c) External impressed current supply and sacrificial anode

The explanation is: Cathodic protection is achieved by supplying electrons to the metal structure to be protected. Types of cathodic protection are i. External impressed current supply ii. Sacrificial anode.