STUDY ON CORROSION RESISTANCE OF CARBON NANOTUBES REINFORCED Al2O3 COATING
Keywords:Al2O3 coating, air plasma spray, carbon nanotubes
This paper presents our research on the reinforcement with 1 % of carbon nanotubes (CNT) for a ceramic Al2O3 coating applied by air plasma spray (APS) on CT3 steel. The corrosion resistances of both CNTs reinforced and non-CNTs reinforced Al2O3 coatings were investigated by using different such techniques as: potentiodynamic polarization; electrochemical impedance spectroscopy (EIS); salt spray and erosion corrosion tests.
The obtained results show positive effects of CNT to improve the corrosion protection of the Al2O3 coating: time of appearance of first rust points on the surface in the salt spray test increased from 2 hours for pure Al2O3 coating to 24 hours for the CNTs-Al2O3 one; the erosion-corrosion resistance of the CNTs-Al2O3 coating increased about 17 % in comparison with the one of the Al2O3 coating.
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