In order to improve the wet sliding wear performance of drilling tools in marine environment, the micro-structured and bimodal-structured WC-10Co4Cr coatings were prepared by High Velocity Oxygen Fuel (HVOF) technology, respectively. The microstructure, phase composition, mechanical properties, corrosion resistance and wet sliding wear performance of the coatings were investigated in simulated seawater drilling fluid. Compared with the micro-structured coatings, the bimodal-structured coatings have denser microstructure, lower porosity and higher microhardness. The WC-10Co4Cr coatings have been corroded by soaking in simulated seawater drilling fluid with different pH values. And then the wet sliding wear is carried out in simulated seawater drilling fluid. It is found that corrosion inhibits wear and shows negative synergistic effect. When the pH value of the simulated seawater drilling fluid is 11, the negative synergistic effect is the most significant and the wear rate is the lowest. Under the same conditions, the bimodal-structured coating has better wet sliding wear resistance. The main failure mechanisms of the coatings are abrasive wear, corrosion wear and fatigue wear.
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This project is supported by the National Natural Science Foundation of China (Grant No. 52175196), the Pre-Research Program in National 14th Five-Year Plan (Grant No. 61409230614), the Tribology Science Fund of State Key Laboratory of Tribology (Grant No. SKLTKF19B12), the Fundamental Research Funds for Central Universities (Grant Number 2652019069).
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Zhou, Yk., Kang, Jj., Yue, W. et al. Wet Sliding Wear of HVOF-Sprayed WC-10Co4Cr Coatings in Simulated Seawater Drilling Fluid. J Therm Spray Tech 30, 2174–2186 (2021). https://doi.org/10.1007/s11666-021-01287-8