Abstract
The abrasion-corrosion resistance of bonding matrix materials for impregnated diamond bits reinforced individually with WC, TiC, Cr3C2, and B4C particles was investigated in an alkalic saline silica slurry. Potentiodynamic polarization and electrochemical impedance spectroscopy were used to investigate their corrosion behaviors. The worn surfaces’ morphology and the compositions of corrosion products were characterized. The results show that the weight loss of WC or TiC reinforced composite during tribocorrosion test was much lower than that of Cr3C2 or B4C-based composite; compared with WC-based composite, TiC- and Cr3C2-based composites had better corrosion resistance, consequently decreasing their synergistic effect of abrasion and corrosion. Therefore, TiC could be a potential substitute for WC as reinforcing phase in the bonding matrix for impregnated diamond bits.
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