Definition - What does Anodic Protection mean?
Anodic protection is the method or technique adopted to reduce the corrosion of the surface of a metal by connecting it as an anode with respect to an inert cathode in the cell formed due to an electrochemical reaction in the corrosive environment, and ensuring that the electrode potential is controlled to keep the metal in a passive state.
Corrosionpedia explains Anodic Protection
Anodic protection is preferred for mild steel storage vessels containing concentrated acidic or alkaline fluids such as concentrated sulfuric acid. In order to keep the metal surface in a passive state, this protection system includes a direct current low-voltage power supply with feedback control.
For certain metals such as steel alloys and stainless steels, anodic protection is preferred over cathodic protection. This technique is effective only as long as the direct current power supply is closely monitored. The passive film formed on a metallic surface, due anodic polarization as a result of direct current potential applied to it, is responsible for the protection of the metal from corrosion damage.
Study of anodic protection is significant because this method of protection is adopted in aerospace and other critical applications, and in situations where cathodic protection is not cost effective.