采用3种不同NiCr粘结相含量和两种不同尺度WC颗粒的金属陶瓷粉末,运用超音速火焰喷涂（HVOF）方法制备了Cr3 C2-NiCr、WC-12%Co涂层,在5%H2 SO4、15%棕刚玉和水混合介质条件下,运用腐蚀冲蚀磨损试验机测定了涂层在45°冲蚀角下的失重量变化规律,研究了喷涂粉末NiCr含量和WC颗粒尺度对所沉积金属陶瓷涂层耐腐蚀冲蚀磨损性能的影响。结果表明,HVOF喷涂Cr3C2-NiCr、WC-12%Co涂层在5%H2SO4、15%棕刚玉和水混合介质条件下的腐蚀冲蚀率均低于低碳钢,并且Cr3 C2-NiCr涂层的抗腐蚀冲蚀性能要优于WC-12%Co涂层。Cr3 C2-40%NiCr和Cr3 C2-25%NiCr涂层其腐蚀冲蚀率低于Cr3 C2-10%NiCr涂层,与纳米尺度WC颗粒相比,微米尺度WC颗粒所制备的WC-12%Co涂层的抗腐蚀冲蚀性能较好。
Cr3C2-NiCr and WC-Co coatings were deposited on a mild steel by high velocity oxy-fuel spraying（HVOF） using powders with different content of NiCr and different size of WC particles.Microstructure and corrosion-erosion wearing properties of the coatings were examined by SEM and corrosion-erosion wear test.The wear mass loss of the coatings was tested during erosion and corrosion at jet angle of 45° with mixture of 5% H2SO4 and 15% brown alumina in water.The influence of NiCr content and WC size of powder on corrosion-erosion rate of the coating was evaluated.The results show that the accumulated weight loss of per square centimeter coatings increases linearly with testing time.The erosion-corrosion rates of HVOF sprayed Cr3C2-NiCr and WC-12%Co coatings are lower than that of mild steel.The corrosion-erosion performance of the coatings deposited with Cr3C2-25%NiCr and Cr3C2-40%NiCr powders is better than that of deposited with Cr3C2-10%NiCr powder.Moreover,the corrosion-erosion rate of WC-12% Co coating prepared with micron WC particles is lower than that of the coating deposited using nano-sized WC powder.
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