High-velocity oxy-fuel and high-velocity air fuel sprayed WC-Co-Cr coatings on solution-treated 21-4N steel for slurry and corrosion resistance

Journal of Electrochemical Science and Engineering Pub Date : 2024-04-23 DOI:10.5599/jese.2246

Rajanna Lingappa, Tumakur Gangadhar Mamatha, MS Prabhuswamy, Vikrant Singh, A. Bansal

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Abstract

This study aims to fabricate WC-Co-Cr coatings on the solution-treated 21-4N steel utilizing high-velocity oxy-fuel (HVOF) and high-velocity air fuel (HVAF) techniques. The microstructure, hardness, surface quality, porosity, slurry erosion, and corrosion resistance of HVOF and HVAF coatings on solution-treated 21-4N steel were investigated and compared. The HVAF sprayed WC-Co-Cr coating exhibited dense structure, more hardness (1582 HV), greater fracture toughness (5.69 MPa m1/2), less decarburization, and lower porosity (0.97 %) as compared to HVOF sprayed coating. Further, slurry jet erosion tests and electrochemical corrosion tests provide a comprehensive evaluation of the coating’s performance under erosive and corrosive conditions. Eventually, the conclusive results of the study affirm the exceptional performance of the high-velocity air fuel sprayed WC-Co-Cr coating, demonstrating its superiority in both erosion and corrosion resistance compared to the high-velocity oxygen fuel sprayed coating.

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在经过固溶处理的 21-4N 钢上喷涂高速纯氧燃料和高速空气燃料的 WC-Co-Cr 涂层，以提高抗泥浆和耐腐蚀性能

本研究旨在利用高速纯氧燃料（HVOF）和高速空气燃料（HVAF）技术在固溶处理过的 21-4N 钢上制造 WC-Co-Cr 涂层。研究并比较了固溶处理 21-4N 钢上的 HVOF 和 HVAF 涂层的微观结构、硬度、表面质量、孔隙率、浆液侵蚀和耐腐蚀性。与 HVOF 喷涂涂层相比，HVAF 喷涂的 WC-Co-Cr 涂层结构致密，硬度更高（1582 HV），断裂韧性更大（5.69 MPa m1/2），脱碳更少，孔隙率更低（0.97 %）。此外，浆液喷射侵蚀试验和电化学腐蚀试验对涂层在侵蚀和腐蚀条件下的性能进行了全面评估。最终，研究的结论性结果肯定了高速空气燃料喷涂的 WC-Co-Cr 涂层的优异性能，表明与高速氧气燃料喷涂的涂层相比，它在抗侵蚀和抗腐蚀方面都更胜一筹。

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Journal of Electrochemical Science and Engineering

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