耐铝液侵蚀性能
(湖南科技大学 机械设备健康维护重点实验室， 湘潭 411201)
摘 要: 研究电沉积Ni-P/纳米Al2O3复合镀层的干摩擦磨损性能和耐铝液侵蚀性能，采用扫描电镜(SEM)观察Ni-P/纳米Al2O3复合镀层的磨损表面形貌以及铝与Ni-P/纳米Al2O3复合镀层的界面结构。结果表明：Ni-P/纳米Al2O3复合镀层(镀态)与淬火45钢对摩时的摩擦因数为0.45~0.55，磨损表现为疲劳剥落；经400 ℃热处理后，Ni-P/纳米Al2O3复合镀层与淬火45钢对摩的摩擦因数为0.20~0.24，磨损机理表现为轻微粘着和磨蚀；铝液在Ni-P/纳米Al2O3复合镀层表面的润湿角为109˚，Ni-P/纳米Al2O3复合镀层具有良好的耐铝液侵蚀性能。
关键字: Ni-P/纳米Al2O3复合镀层；脉冲电沉积；耐蚀性能；疲劳剥落；粘着；磨蚀
（Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment,
Hunan University of Science and Technology, Xiangtan 411201, China）
Abstract:The tribological properties under dry sliding condition and erosion resistance of Ni-P/nano-Al2O3 composite coatings pulse electroplated to aluminum liquid were investigated. The worn surface morphologies of the coatings and the interface structures between aluminum and Ni-P/nano-Al2O3 composite coatings were observed by scanning electron microscopy (SEM). The results demonstrate that the friction coefficient of the as-deposited composite coatings against quenched 45 steel is 0.45−0.55; its wear mechanism is fatigue flake. The friction coefficient of 400 ℃ heat-treated composite coatings against quenched 45 steel is 0.20−0.24; their worn surfaces exhibit slight adhesion and abrasion. The wetting angle of the aluminum liquid on the composite coatings is 109˚, showing that the composite coatings present good erosion resistance to the aluminum liquid.
Key words: Ni-P/nano-Al2O3 composite coating; pulse electroplating; erosion resistance; fatigue flake; adhesion; abrasion
