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Overall, cathodic protection is a critical method for preserving the integrity and longevity of metallic structures exposed to corrosive environments, ensuring operational safety and efficiency in various industries.
This method is widely employed to protect underground pipelines, tanks, ship hulls, offshore platforms, and other metallic structures from corrosion caused by environmental factors such as soil or water.
Types of Cathodic Protection: Galvanic (Sacrificial) Anodes: This method uses more active metals such as zinc or magnesium, which are electrically connected to the structure to be protected.
In cathodic protection, the metal structure is made the cathode by applying a direct current (DC) to it from an external source, typically a sacrificial anode or an impressed current system.
How Cathodic Protection Works: Electrochemical Principle: Corrosion occurs when a metal surface acts as an anode and loses electrons, oxidizing in the presence of an electrolyte (e.
Impressed Current Cathodic Protection: In this method, an external power source (rectifier) is used to supply a controlled DC current to the structure to be protected.
Cathodic protection (CP) is a technique used to control the corrosion of metal surfaces by making the metal itself the cathode of an electrochemical cell.
Reference Electrodes: Used to measure the potential of the protected structure relative to a known standard, ensuring proper CP operation.
Applications: Pipelines: CP is extensively used to protect underground and underwater pipelines transporting oil, gas, water, etc.