Cathodic Interference

Last updated: July 3, 2017

What Does Cathodic Interference Mean?

Cathodic interference refers to an intermolecular type of bond used to ground a negatively charged electrode system.

Cathodic interference is produced when there is proximity to a polarized cathode. The current flow is always away from the area near the cathode. In this type of interference, the potential turns in the positive direction where currents leave the structure and this region will be most prone to corrosion.


Corrosionpedia Explains Cathodic Interference

Countermeasures such as the following should be implemented to prevent corrosion related to the interference bond:

  • Eliminate the source of stray current
  • Reduce the output current
  • Cathodic shielding
  • Electrical bonding
  • Sacrificial anodes

There are different ways that corrosion resistant alloys can be formed via cathodic interference. These include:

  • Increased thermodynamic stability
  • Kinetic retardation involving the anodic process
  • Kinetic retardation involving the cathodic process
  • Generation of passivating and stable oxide layers

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