Principles of CP Anti-Corrosion Coatings

From the above discussions, it should be apparent that metal corrosion is primarily an oxidative process, involving loss of electrons from the metal to an oxidizing species in the environment. Thus, the fundamental nature of corrosion is electrochemical. It is this fundamental electrochemical, electronic nature of corrosion that CP coatings address. 

A more theoretically rigorous approach to explain CP anti-corrosion is that first apparently propounded by Jain et d. in a series of papers [938-940, 942]. Jain et al. 

In this technology, the choice of the SC (i.e. the CP) is important higher bandgap SCs generally provide a higher electronic barrier, but in many cases also a poorer match to the Fermi level (work function) at the interface. 

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