Abstract
CeO2 coatings were formed on the aluminum after Al surface preparation, by dripping the ceria sol, previously prepared by forced hydrolysis of Ce(NO3)4. The anticorrosive properties of ceria coatings were investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to 0.03% NaCl. The morphology of the coatings was examined by the scanning electron microscopy (SEM). EIS data indicated considerably larger corrosion resistance of CeO2-coated aluminum than for bare Al. The corrosion processes on Al below CeO2 coating are subjected to more pronounced diffusion limitations in comparison to the processes below passive aluminum oxide film, as the consequence of the formation of highly compact protective coating. The results show that the deposition of ceria coatings is an effective way to improve corrosion resistance for aluminum.
Highlights
It is well known that chromate-based chemical conversions were used for corrosion protection of aluminum for decades
The anticorrosive properties of ceria coatings were investigated by the electrochemical impedance spectroscopy (EIS) during the exposure to 0.03% NaCl
The results show that the deposition of ceria coatings is an effective way to improve corrosion resistance for aluminum
Summary
It is well known that chromate-based chemical conversions were used for corrosion protection of aluminum for decades. Because of toxic and carcinogenic properties of chromium, this kind of coatings should be soon withdrawn from all industrial processes [1,2]. CERIUM OXIDE IN CORROSION PROTECTION OF Al. Many researchers tried to find alternative for chromate conversions; it is believed that rare earth elements (cerium, lanthanum, neodymium and yttrium) could effectively inhibit the corrosion of aluminum. The reported results showed that these barrier coatings prevent contact between aluminum surface and corrosive species. The best degree of corrosion inhibition is achieved with cerium [5,6,7,8]
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