The comparison in corrosion behavior of Fe-Ni-Cr composite coatings reinforced by SiC nanoparticles and carbon nanotubes

In this study, the corrosion behavior of Fe-Ni-Cr composite coatings reinforced by SiC and carbon nanotube (CNT) has been investigated. In this regards, the electrodeposion processing has been done in a chloride bath in the presence of SiC nanoparticles and carbon nanotubes. The prepared coatings were characterized using X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The corrosion behavior of coatings was also examined in NaCl 3.5% electrolyte by potentiostat analysis. The results showed that, the prepared amorphous - nanocrystalline Fe-Ni-Cr coating in lower current densities has higher corrosion behavior due to lower density of micro-cracks in coat. The annealing process and the crystallization of amorphous phase (at 250oC for 10 h) had the positive effects on corrosion resistance of prepared coats. The corrosion resistance of composite coatings was higher than alloyed coatings. In this condition, the highest corrosion resistance was achieved in the presence of SiC nanoparticle in the coats.