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How Does Cathodic Protection Stop Corrosion?

How Does Cathodic Protection Stop Corrosion? August 1, 2014

Cathodic protection prevents corrosion by converting all of the anodic (active) sites on the metal surface to cathodic (pasice) sites by supplying electrical current (or free electrons) froms an alternate source. In the case of alumunium anodes, the reaction at the alumunium surface is :(four alumunium ions plus twelve free electrons) As long as the current (free electrons) is arriving at the cathode (steel) faster than oxygen is arriving, no corrosion will occur.

Protected vs Unprotected structures as verified by cathodic protection potential
Protected vs Unprotected structures as verified by cathodic protection potential