Comparison Of Two Methods Of Cathodic Protection

Both methods of cathodic protection use a cathodic protection current source to provide sufficient protection current in the opposite direction of the original corrosion current to the metal body that is corroded or has corrosion and needs protection, so that it can just offset the corrosion current that originally existed in the metal. The difference between the two methods lies only in the way and "source" of generating the protection current. One is to use a metal or alloy with a more negative potential, and the other is to use a DC power supply. Forced current cathodic protection has a high driving voltage, a large output current, and a wide effective protection range. It is suitable for long-distance and large-diameter pipelines with a large protected area. Sacrificial anode cathodic protection does not require an external power supply, and its maintenance and management are economical and simple. It has little interference with adjacent underground metal structures and is suitable for short-distance, small-diameter, and dispersed pipelines.