Savcor Anodic Protection (AP), is effective in very high or very low pH environments like in pulp digesters and impregnation vessels.
In an anodic protection the metal surface is polarized with rectifiers feeding direct current through cathodes. Anodic current forms a strong passive oxide film on carbon steel and makes it corrosion resistant, even in the harshest environments. Erosion corrosion or pitting corrosion cannot cause failures on surfaces with anodic protection. Dangerous cracks by stress corrosion are also avoided.
When installed in old equipment, Savcor Anodic Protection System prevents corrosion already in action. The key for protection control is measuring the electrochemical potential of the protected structure. The required protection current is adjusted based on the potential values measured. In an Anodic Protection, the target potential is more positive than the natural potential.
Typical targets for Anodic Protection :
The Savcor Anodic Protection System consists of:
The first Anodic Protection System for a Pulp Digester was installed by Savcor in early 80´s. Savcor got an opportunity to test its new electrochemical technology in a digester that had already severe cracks and was threatened by closure. The AP worked amazingly well and digester´s life time was extended by tens of years.
Since then Savcor has protected pulp digesters and impregnation vessels all around the world.