Cathodic Protection
Cathodic protection is a system utilized to inhibit corrosion of structures, such as underground pipes, tanks, etc. Corrosion is an electrochemical process in which a current leaves a structure at the anode site, passes through an electrolyte, and reenters the structure at the cathode site. For example, because it is in a soil with low resistivity compared to the rest of the line, current would leave the pipeline at that anode site,
pass through the soil, and reenter the pipeline at a cathode site. Current flows because of a potential difference between the anode and cathode
. The anode potential is more negative than the cathode potential, and this difference is the driving force for the corrosion current. The total system – anode, cathode, electrolyte, and metallic connection between anode and cathode is termed a corrosion cell. For corrosion to occur, the following conditions are required.
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