The coatings produced with high-velocity oxygen fuel spraying technology can greatly improve wear and corrosion resistance. In this study, WC-12% Ni coating was applied on the lamellar graphite cast iron substrate. Morphologies and structures of uncoated samples and sprayed coatings were analyzed with light microscopy, scanning electron microscope, energy dispersive spectrometry and X-ray diffraction. Although their micro-hardness, porosity, abrasion and corrosion properties were studied, wear experiments were performed at normal atmospheric conditions (under room temperature and 30% humidity) in the reciprocating wear testing machine. The corrosion resistance of the coatings was measured using potentio-dynamic polarization. The results revealed that the microstructure was porous, had micro-cracks, and contained some inhomogeneous structures such as carbide. Energy dispersive spectrometry analysis revealed that the presence of phases indicated the success in coating process. It was found that the WC-12% Ni coating exhibited lower potential and lower corrosion current density compared to those of the uncoated sample.

中文翻译：

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灰口铸铁超音速火焰喷涂WC-12% Ni涂层的腐蚀磨损行为

采用高速氧燃料喷涂技术生产的涂层可以大大提高耐磨性和耐腐蚀性。在本研究中，WC-12% Ni 涂层应用于层状石墨铸铁基体上。用光学显微镜、扫描电子显微镜、能谱仪和 X 射线衍射分析了未涂层样品和喷涂涂层的形貌和结构。尽管研究了它们的显微硬度、孔隙率、磨损和腐蚀特性，但磨损实验是在往复式磨损试验机中在正常大气条件下（室温和 30% 湿度下）进行的。使用动电位极化测量涂层的耐腐蚀性。结果表明，微观结构是多孔的，有微裂纹，并含有一些不均匀的结构，如碳化物。能量色散光谱分析表明，相的存在表明涂层工艺成功。结果表明，与未涂层样品相比，WC-12% Ni 涂层表现出较低的电位和较低的腐蚀电流密度。