Abstract
In this paper, the effects of slurry flow velocity and impact angle on erosion–corrosion (E–C) behavior of the chromium carbide coating in NaCl solution containing SiO2 particle were investigated. A jet impingement system was used. The mass loss test, polarization curve and surface characterization were employed to examine the coating performance. The erosion–corrosion regime of the Cr7C3-coated and uncoated specimens was determined. Results showed that pure erosion and corrosion-enhanced erosion were the dominant regime for the uncoated samples. However, both the erosion and corrosion contributed to the coating damage. Mass loss values of the coated and uncoated samples increase with flow velocity. In addition, coated and uncoated samples experience maximum mass loss at 45° and 90°, respectively. Finally, E–C degradation mechanisms were evaluated using scanning electron microscopy. The images indicate the abrasive wear mechanism and lips removal as well as plastic deformation for the uncoated sample. Also, brittle fracture, cracking and flake fragmentation were recommended as the main fracture mechanism for the chromium carbide coating.
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