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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Spray Parameters on the Corrosion Behavior of HVOF Sprayed WC-Co-Cr Coatings
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Effect of Spray Parameters on the Corrosion Behavior of HVOF Sprayed WC-Co-Cr Coatings

机译：喷涂参数对超音速火焰喷涂WC-Co-Cr涂层的腐蚀行为的影响

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摘要

WC-10Co-4Cr cermet coatings were deposited on the substrate of AISI 1045 steel by using high-velocity oxygen-fuel (HVOF) thermal spraying process. The Taguchi method including the signal-to-noise (S/N) ratio and the analysis of variance (ANOVA) was employed to optimize the porosity and, in turn, the corrosion resistance of the coatings. The spray parameters evaluated in this study were spray distance, oxygen flow, and kerosene flow. The results indicated that the important sequence of spray parameters on the porosity of the coatings was spray distance > oxygen flow > kerosene flow, and the spray distance was the only significant factor. The optimum spraying condition was 300 mm for the spray distance, 1900 scfh for the oxygen flow, and 6.0 gph for the kerosene flow. The results showed the significant influence of the microstructure on the corrosion resistance of the coatings. Potentiodynamic polarization and electro-chemical impendence spectroscopy (EIS) results showed that the WC-10Co-4Cr cermet coating obtained by the optimum spraying condition with the lowest porosity exhibits the best corrosion resistance and seems to be an alternative to hard chromium coating.
机译：通过使用高速氧气-燃料（HVOF）热喷涂工艺，在AISI 1045钢的基材上沉积WC-10Co-4Cr金属陶瓷涂层。采用Taguchi方法，包括信噪比（S / N）和方差分析（ANOVA），以优化孔隙率，进而优化涂层的耐腐蚀性。在这项研究中评估的喷雾参数是喷雾距离，氧气流量和煤油流量。结果表明，喷涂参数对涂层孔隙率的重要影响顺序为：喷涂距离>氧气流量>煤油流量，而喷涂距离是唯一的重要因素。最佳喷涂条件是：喷涂距离为300 mm，氧气流量为1900 scfh，煤油流量为6.0 gph。结果表明，显微组织对涂层的耐蚀性有显着影响。电位动力极化和电化学阻抗谱（EIS）结果表明，在最佳喷涂条件下以最低的孔隙率获得的WC-10Co-4Cr金属陶瓷涂层具有最佳的耐腐蚀性，并且似乎可以替代硬铬涂层。

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