What is it and how does it work?

Why does steel corrode in sea water?

To fully understand the importance of cathode protection , the mechanism of corrosion itself must be understood  in the first place. There are three factors that underlie the occurrence of corrosion:

  1. two dissimilar metals
  2. one electrolyte (water with any type of salt or  salts dissolved in it)
  3. a conducting path between the metals