Comparison of Sacrificial Anode and Impressed Current Cathodic Protection Methods using Electric Resistance of Mild Steel

Corrosion is a universal process occurring due to chemical reactions between metal and the environment. Corrosion of the metal can be controlled by numerous methods, and among many controlling methods cathodic protection is noteworthy. Cathodic protection of metal consists of two methods namely impressed current method and sacrificial anode method. Both methods deal with the transportation of electrons either receiving or donating from or to the metal or to the environment. Again, the electric resistance of a metal piece is inversely proportional to this cross-sectional area. If a metal bar corrodes fast, then its cross-sectional area reduces rapidly and its electric resistance increases highly. So, the relation between corrosion and electrical resistance of the metal is a helpful parameter to determine the corrosion rate. In this paper, we determine the corrosion behavior of mild steel exposed to different concentrations of ionic liquid to compare the possible variations in the corrosion protection techniques for the mild steel used.