342 Evaluating the Corrosion and Wear Behavior of HVOF Sprayed Fe3Ti4O-NiCr Coating on Plain Carbon Steel
DOI:
https://doi.org/10.17159/Abstract
Fe3O4 coating together with NiCr was applied on the substrate of low-carbon steel by High-Velocity Oxygen Fuel (HVOF) thermal spraying process. Scanning electron microscopy (SEM/EDS), X-ray diffraction analysis (XRD) and micro hardness were utilized to assess microstructure, existence phases and hardness of coatings. The phase analysis showed the formation of oxide compounds on the coatings. The hardness of Fe3TiO4 and Fe3TiO4-NiCr was measured equal to 580 and 970 Vickers, respectively. The corrosion behavior of the coatings in 3.5% NaCl solution was investigated with electrochemical impedance spectroscopy (EIS) and polarization tests. The electrochemical results indicated that the coating composing of NiCr presents a superior corrosion performance compared to other coatings. This behavior was attributed to the low porosity of the film which prevents the diffusion of the solution into the substrate. To evaluate the wear behavior, a pin on the disk test was carried out by WC pin as counter body. By incorporation of NiCr compound to the coating, the weight loss Fe3O4 coating was reduced for 80%.
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