What mechanism does cathodic protection use to prevent corrosion in steel reinforcement?

Angel Patricio Garcia

“Cathodic protection prevents corrosion in steel reinforcement by supplying an external electrical current to the steel, making it the cathode in an electrochemical cell. Since corrosion occurs when steel acts as an anode and loses electrons, applying direct current forces the steel to become cathodic instead, gaining electrons and preventing the oxidation reaction responsible for corrosion. There are two main types: Impressed current cathodic protection (ICCP), which uses an external power source to drive the current, and sacrificial anode cathodic protection, which uses a more active metal like zinc or magnesium to corrode in place of the steel. In both cases the goal is to shift the steels electrochemical potential to a point where corrosion becomes thermodynamically impossible.”

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Kareem Hesham Mahmoud Awad

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Kareem Hesham Mahmoud Awad

“Cathodic protection (CP) prevents corrosion in steel reinforcement by supplying an external electrical current to the steel, making it the cathode in an electrochemical cell. Corrosion occurs when steel acts as an anode, losing electrons and dissolving into the surrounding environment. By applying a direct current (DC) to the steel, CP forces the steel to become cathodic, which means it gains electrons instead of losing them. This prevents the oxidation reaction that causes corrosion. There are two main types of CP: impressed current cathodic protection (ICCP), which uses an external power source to drive the current, and sacrificial anode cathodic protection, which uses a more active metal (like zinc or magnesium) as an anode that corrodes instead of the steel. In both cases, the goal is to shift the electrochemical potential of the steel to a level where corrosion is thermodynamically impossible.”

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