Electrochemical Monitoring of Protective Coatings on Food Cans

摘要

In the lacquered tinplates (TP) packaging materials, a chrome-based film and the organic coating are applied over the metallic substrate to provide corrosion protection and to improve the durability of the can and its contents. The protective behaviour of coatings on food cans has been investigated using electrochemical measurements and optical techniques. Experimental impedance diagrams were described in terms of transfer function analysis using non-linear fit routines. According to the model changes of the parameters with immersion time were used to monitor the protective behaviour of the coating.