Surface protection

In practice, metallic components can be protected against corrosive attacks in various ways, depending on the requirements and area of application:

  • Galvanic protection is one of the types of electrochemical protection. The protective current originates from a corrosion element formed by the connection of the metal to be protected with a counter electrode. Galvanic protection can be cathodic or anodic.
  • Anodic protection also belongs to the electrochemical protection classes. The principle here:  The corrosion potential is changed in the positive direction to a value that belongs to the potential range of the passive state.
  • Cathodic protection is an electrochemical protection. Here the change in the corrosion potential takes place in a negative direction - in an area in which the corrosion speed of the metal is considerably reduced.
  • Temporary protection is used, for example, for transport or storage as temporary corrosion protection - this takes place, for example, in the form of oil, conversion layers, wax or protective film (mechanical).