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Thin layers of Al2O3 were used to protect a standard FC250 cast iron at electro-corrosion in acid rain electrolyte solution. In comparison with a cast-iron material we present the results obtained on the metallic covered sample using linear and cyclic potentiometry. The material surface was investigated using scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) techniques. The results present a generalized corrosion with a higher resistance for covered samples (more than 30 times) in comparison with the simple cast iron. The main causes of the corrosion of the covered samples are based on the thin ceramic layer imperfections like pores or micro-cracks that facilitate the contact of the electrolyte solution with the metallic substrate.

Electro-chemical Corrosion of a Cast Iron Protected with a Al2O3 Ceramic Layer