Abstract In this work, we fabricate nanostructured, bimodal, and multimodal WC-10Co4Cr coatings via two high velocity oxy-fuel (HVOF) systems and investigate the coatings’ microstructure, mechanical, electrochemical properties and slurry erosion resistance in 3.5 wt% NaCl solution. The multimodal coating, with a dense microstructure, exhibits lowest decarburization and highest resistance to both corrosion and slurry erosion. The slurry erosion resistance of multimodal coating is enhanced approximately 18% and 11% than the nanostructured and bimodal coatings. However, the performance can easily drop to the worst by changing the HVOF spraying method. The outstanding performance can be attributed to uniform distribution of the multiscale WC grains in the multimodal coating, which effectively reduces the material loss rate during corrosion-accelerated erosion in NaCl solution.

中文翻译：

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超音速火焰喷涂微纳米结构WC-CoCr涂层在NaCl介质中的浆液侵蚀行为及机理

摘要 在这项工作中，我们通过两个高速氧燃料 (HVOF) 系统制备了纳米结构、双峰和多峰 WC-10Co4Cr 涂层，并研究了涂层的微观结构、机械、电化学性能和在 3.5 wt% NaCl 溶液中的耐浆料侵蚀性。具有致密微观结构的多峰涂层表现出最低的脱碳和最高的耐腐蚀和耐泥浆侵蚀能力。多峰涂层的抗泥浆侵蚀能力比纳米结构和双峰涂层提高了大约 18% 和 11%。然而，改变HVOF喷涂方法，性能很容易下降到最差。优异的性能可归因于多模态涂层中多尺度 WC 晶粒的均匀分布，