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Cathodic protection is a widely adopted corrosion prevention technique designed to protect metal structures exposed to aggressive environments such as soil, seawater, and industrial electrolytes.
The fundamental principle of cathodic protection is to convert the protected metal structure into a cathode of an electrochemical cell. By supplying external electrons, anodic corrosion reactions are suppressed, significantly reducing metal loss.
Sacrificial anode cathodic protection uses zinc, aluminum, or magnesium anodes that corrode preferentially to protect steel structures.
Impressed current cathodic protection (ICCP) uses an external power source to deliver controlled protective current, making it suitable for large-scale infrastructure.
Cathodic protection is widely used in oil and gas pipelines, marine vessels, offshore platforms, water supply systems, underground tanks, and reinforced concrete structures.
Cathodic protection is commonly used in soil, seawater, freshwater, and industrial environments where corrosion risks are high.
In practice, cathodic protection is most effective when combined with protective coatings to reduce current demand and improve system efficiency.
Q1: What is cathodic protection used for?
Cathodic protection is used to prevent corrosion of metal structures such as pipelines, tanks, marine vessels, and reinforced concrete.
Q2: What is the difference between sacrificial anode and impressed current systems?
Sacrificial anode systems rely on naturally corroding metals, while impressed current systems use an external power source to provide protection.
Q3: Is cathodic protection suitable for seawater environments?
Yes. Cathodic protection is widely used in seawater applications, especially for ships, offshore platforms, and harbor facilities.
