Simulated Underfilm Corrosion of Coated Mild Steel Using an Artificial Blister

Abstract

An epoxy lacquer was produced on mild steel immersed in sea water containing an artificial blister. A reference, pH, and platinum electrode were also sited within the blister. By using photography and electrochemical methods, the progress of corrosion within the blister was followed. Specific reactions could be identified and tracked, and the corrosion regime within the blister was shown to be under mixed control. Other variables studied were the external solution and the imposition of cathodic protection.