Soil buried pipelines used to transport oil, gas, water, condensates, etc. are one of the most used equipment in industries and their external surface corrosion in addition to safety problems and in some cases environmental, Imposes damages on the industry annually.
Pipelines cathodic protection is used as a complementary coating method to prevent this type of corrosion. The pipelines cathodic protection is accomplished in two ways: sacrificial anode and impressed current and can be temporary (short-term) or permanent (long-term). In the sacrificial anode cathodic protection method, usually is used magnesium or zinc anodes with the backfill, depending on the electrical resistivity of the soil. The impressed current cathodic protection method is used cast iron (HSCI) or mixed metal oxide (MMO) anodes depending on the required current rate and design life.
