Influence of Cr addition on tribocorrosion behavior of high velocity oxygen-fuel thermal sprayed WC-based cermet coatings
Source abstract
Abstract
This research investigates the tribocorrosion behavior and the effect of Cr addition on the wear mechanism of the WC-10Co4Cr and WC-10Co coatings prepared with high velocity oxygen-fuel (HVOF) technology, compared with 3Cr13 substrate. The WC-based cermet coatings exhibited significantly higher microhardness, with average microhardness values of 1488 HV 0.3 and 1429 HV 0.3, respectively. The coatings exhibited minor decarburization during fabrication, and average porosities are 1.2 % and 1.8 %, respectively. In 3.5 wt% NaCl solution, WC-10Co4Cr, and WC-10Co coatings show tribocorrosion resistance 12.5 and 7.6 times greater than that of 3Cr13, respectively. The addition of Cr in the WC-10Co4Cr coating imparted superior corrosion resistance, with the corrosion-wear synergistic interaction affecting only 19.3 % of the coating`s performance. In contrast, the WC-10Co coating showed relatively poorer corrosion resistance, with corrosion-wear interaction accounting for 51.8 % of its volume loss. The main mechanism of corrosion-wear interaction is corrosion-promoted wear. The primary wear mechanisms for the WC-10Co4Cr coating include abrasive wear and electrochemical corrosion wear while the WC-10Co coating also suffers from more severe fatigue wear.
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