Impressed Current Cathodic Protection
Impressed current protection prevents corrosion in an electrolyte by running an external current through auxiliary anodes. Suited for large structures buried in soil or submerged in water.
Physical-Chemical Mechanism of Action
Impressed current protection prevents corrosion in an electrolyte by running an external current through auxiliary anodes. The auxiliary anode releases oxygen and forms a layer on the surface to be protected, which stops corrosion.
Metallurgical Relevance & Risks in Welding
If applied incorrectly, the system can be overloaded or the auxiliary anode can wear out too soon. This leads to corrosion of the protected surface and possibly structural failure.
Workshop Practice & Action Instructions
• Application: Use for large structures buried in soil or submerged in water, such as bridges or water lines.
• Current: Regularly check and adjust to maximize the life of the auxiliary anode.
• Monitoring: Install meters to monitor current flow and voltage.