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please advise how does cathodic protection work
http://www.google.co.in/search?hl=en&q=cathodic+protection+principle&btnG=Search&meta=&aq=f&oq=
Results 1 - 10 of about 64,600 for cathodic protection principle. (0.07 seconds)
http://en.wikipedia.org/wiki/Cathodic_protection
Enter "sacrificial anode" into any internet search engine.
In addition to this, there are also impressed current systems to conisder. Active vs. passive.
OP will need to sort this out depending on his needs.
That's "anodic" protection. Not altogether the same thing, though the intent is similar.
By George! I zinc he's got it!