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为提高不锈钢摩擦副在腐蚀环境中的服役寿命,利用等离子喷涂技术制备了WC-10Co4Cr涂层,研究了涂层的物相结构、腐蚀摩擦学特性与电化学特性。研究表明,等离子喷涂WC-10Co4Cr涂层中的WC脱碳产生少量W_2C、W以及η相,当喷涂电流为650A,电压为56V时,涂层孔隙率低、致密性好。涂层在中性溶液中的摩擦系数为0.3387~0.3682,呈现伴随(WC、W_2C)-CoCr电偶腐蚀的磨料磨损;在酸性溶液中摩擦系数为0.3224~0.3981,表现为CoCr相的点蚀磨损。等离子喷涂的WC-10Co4Cr涂层增强了1Cr18Ni9Ti基体的耐腐蚀能力,基体在3.5%NaCl溶液中腐蚀电位由-617mV提高到-335~-290mV;在酸溶液中将基体的腐蚀电位由-502mV提高到-206~-179mV。
In order to improve service life of stainless steel friction pair in corrosive environment, WC-10Co4Cr coating was prepared by plasma spray technique. The phase structure, corrosion tribological properties and electrochemical properties of the coating were studied. The results show that the WC decarburization of WC-10Co4Cr coating produces a small amount of W_2C, W and η phases. When the spraying current is 650A and the voltage is 56V, the coating porosity is low and the compactness is good. The coefficient of friction of the coating in neutral solution is 0.3387-0.3682, which shows abrasive wear with (WC, W_2C) -CoCr galvanic corrosion. The friction coefficient in acidic solution is 0.3224-0.3981, which shows the pitting wear of CoCr phase . Plasma-sprayed WC-10Co4Cr coating enhanced the corrosion resistance of 1Cr18Ni9Ti matrix. The corrosion potential of matrix in 3.5% NaCl solution increased from -617mV to -335 ~ -290mV. The corrosion potential of the matrix increased from-502mV in acid solution To -206 ~ -179mV.