Mg-Mn-Ce镁合金表面功能纳米有机薄膜的制备与摩擦学特性

Preparation and Tribological Behavior of Functional Polymeric Nano-films on a Mg-Mn-Ce Alloy Surface

通过有机镀膜技术在Mg-Mn-Ce镁合金表面制备了有机薄膜,采用接触角测量仪测定了有机薄膜的蒸馏水接触角,使用椭圆偏振光谱仪测试了薄膜厚度,利用X射线光电子能谱仪(XPS)表征了薄膜表面典型元素的化学状态,使用原子力显微镜(AFM)观察了薄膜的表面形貌,并借助于纳米划痕测试仪评价了薄膜在微载荷下的摩擦学特性.研究结果表明:有机镀膜后镁合金表面形成了有序的纳米有机薄膜,有机薄膜与蒸馏水的接触角数值为108.6°(未处理镁合金基体与水的接触角为45.8°),实现了由亲水向疏水功能特性的转变;未处理镁合金基体的摩擦系数为0.127,有机镀膜后镁合金的摩擦系数为0.078,因此疏水性纳米薄膜能够有效降低摩擦系数.

Polymeric film was successfully prepared on the surface of a Mg-Mn-Ce alloy by the polymer plating.The contact angle of distilled water and thickness of polymeric film were determined by contact angle meter and spectroscopic ellipsometer.The chemical states of typical elements on film surface were characterized by X-ray photoelectron spectroscopy（XPS）,and the film morphology was observed by atomic force microscopy（AFM）.Tribological property of the film was evaluated on a nano scratch tester using loads of several tens to hundreds mN.The experimental results showed that the polymeric nano film was orderly formed on magnesium alloy surface.The conversion of functional performance from hydrophilic to hydrophobic was achieved as evident by the contact angle of distilled water（108.6 ° for the film and 45.8 ° for the substrate）,and the friction coefficient was effectively reduced from 0.127 for substrate to 0.078 of hydrophobic nano film on the surface of polymer-plated magnesium alloy.Therefore,surface modification by polymer plating is consideredas a promising technique in microelectromechanical system.