Yaxu JIN
材料科学技术（英文）
Nickel-phosphorus (Ni-P) composite coatings containing potassium titanate (K2Ti6O13) whiskers (PTWs) were prepared by electroless plating. The surface morphology and component of coatings were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), respectively before and after wear test. The tribological performance was evaluated using a pin-on-disk wear tester under dry conditions. It is found that the Ni-P-PTWs composite coatings exhibit higher wear resistance than Ni-P and Ni-P-SiC electroless coatings. The favorable effects of PTWs on the tribological properties of the composite coatings are attributed to the super-strong mechanical properties and the specific tunneling structures of PTWs. The PTWs greatly reinforce the structure of the Ni-P-based composite coatings and thereby greatly reduce the adhesive and plough wear of Ni-P-PTWs composite coatings.
关键词:
Potassium titanate whiskers
,
化学镀
,
复合镀层
,
摩擦学性能
李姝
,
董寅生
,
盛晓波
,
郭超
,
储成林
表面技术
doi:10.3969/j.issn.1001-3660.2010.01.012
为改善医用AZ31镁合金的抗蚀性能,综合应用阳极氧化及化学转化工艺在其表面制备了复合膜层.通过扫描电镜观察了膜层形貌,X射线衍射分析了膜层成分,并利用电化学测试手段对膜层性能进行了表征.结果表明,阳极氧化工艺制备的膜层粗糙不平,主要组成为Mg(OH)_2及Al_2O_3;经化学转化后,所得复合膜较为致密、平整,膜层中主要含元素N,O,P.动电位极化曲线分析表明,复合膜对AZ31镁合金具有显著的保护作用.EIS阻抗图谱拟合电路反映出制备的复合膜层具有4层结构,从侧面证明了阳极氧化膜与化学转化膜之间的化学结合作用.
关键词:
医用镁合金
,
AZ31镁合金
,
复合膜层
,
阳极氧化
,
化学转化
