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为研究碳化物类金属陶瓷涂层在海洋气氛下的抗腐蚀与抗磨损性能,采用超音速火焰喷涂技术(HVOF)制备了WC-10Co4Cr和Cr_3C_2-Ni Cr2种典型的金属陶瓷涂层,采用自制的盐雾喷射腐蚀-磨损装置,研究涂层的腐蚀-磨损行为,同时与传统的硬铬镀层作对比,并采用扫描电镜(SEM)、能谱分析(EDAX)等表征试样的腐蚀磨损形貌特征。结果显示,在干燥大气环境下铬镀层主要表现为黏着-磨损机制,Cr_3C_2-Ni Cr涂层同时表现出黏着-磨损与磨粒-磨损机制,而WC-10Co4Cr则表现为单纯的磨粒-磨损。施加盐雾气氛后,试样表面形成有液态膜,摩擦系数与磨损量均有所下降。盐雾气氛下增大摩擦副的载荷压力,Cr_3C_2-Ni Cr涂层的磨损量增加很快,而WC-10Co4Cr涂层的磨损机制发生转变,磨损量出现不增反降现象。
In order to study the corrosion resistance and wear resistance of carbides cermet coatings in marine atmosphere, two typical cermet coatings of WC-10Co4Cr and Cr_3C_2-NiCr2 were prepared by HVOF. The corrosion-wear behavior of the coating was studied by salt spray jet erosion-abrasion device. The corrosion-wear behavior of the coating was also compared with that of the conventional hard chromium coating. The corrosion wear of the sample was characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDAX) Appearance features. The results show that the chrome plating mainly shows the adhesion-wear mechanism under dry atmosphere. The Cr3C2-Ni Cr coating shows the adhesion-wear and abrasive-wear mechanism at the same time, while the WC-10Co4Cr shows simple abrasive-wear . After applying the salt spray atmosphere, a liquid film is formed on the sample surface, and the friction coefficient and the wear amount decrease. Under the salt mist atmosphere, the load pressure of the friction pair is increased, the wear amount of the Cr_3C_2-Ni Cr coating increases rapidly, while the wear mechanism of the WC-10Co4Cr coating changes, and the wear amount does not increase or decrease.