(1. 西安理工大学 材料科学与工程学院，西安 710048；
2. 西安工业大学 材料与化工学院，西安 710032)
摘 要: 采用非平衡磁控溅射技术在铝基轴承合金表面制备AlSn20/C复合镀层，通过扫描电镜形貌观察、交流阻抗和极化曲线的测量研究石墨靶电流对镀层组织与耐蚀性能的影响。结果表明：在电流0.2~0.8 A范围内，薄膜均以层状结构生长，且电流越小，薄膜组织越致密；镀膜后试样的电化学阻抗比基体的高5~6个数量级，石墨靶电流为0.2 A时，可将基体的自腐蚀电位由−1.42 V提高到−1.18 V，石墨靶电流是影响AlSn20/C复合镀层耐蚀性的一个重要因素，石墨靶电流越小，其耐蚀性越好。
关键字: 轴承合金；AlSn20/C镀层；耐蚀性；自腐蚀电位
（1. Institute of Materials Science and Technology, Xi’an University of Technology, Xi’an 710048, China;
2. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, China）
Abstract:The AlSn20/C composite films were deposited on the surface bearing alloy by non-equilibrium magnetron sputtering. The influence of carbon target current on the structure and corrosion resistance were studied by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and polarization curves. The results indicate that when the current is in the range of 0.2−0.8 A, the film is in layer structure, and the lower the current is, the compacter the film structure is. The composite coating can improve the electrochemical impedance by 5−6 order of magnitude. When the carbon target current is 0.2 A, the self-corrosion potential can be improved from −1.42 V to −1.18 V. The carbon target current is an important factor to affect the corrosion resistance of AlSn20/C composite coating, the lower the target current is, the better the corrosion resistance is.
Key words: bearing alloy; AlSn20/C composite coating; corrosion resistance; self-corrosion potential
