Anodic Protection Against Corrosion and Cracking of Digester Vessels, 2003 Fall Technical Conference
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Corrosion studies in a number of digester extraction liquors have confirmed that carbon steel has a profound
active/passive transition. Anodic protection of digesters relies on the ability of carbon steel to passivate. Anodic
protection has been effective in preventing stress corrosion cracking, although it may not stop the propagation of
existing stress corrosion cracks. Significant reductions in corrosion rate can be achieved by shifting the corrosion
potential from active values to passive values. Passive corrosion rates for carbon steel in high temperature
extraction liquors can still be appreciable.