(大连海事大学 交通运输装备与海洋工程学院，大连 116026)
摘 要: 为制备具有更高机械强度和更长使用寿命的超疏水金属表面，利用激光加工技术在铝镁合金表面构建出圆台凸起、圆台凹坑和正四棱台3种微结构。利用自组装技术在具有以上3种微结构的铝镁合金表面沉积自组装分子膜(SAMs)，采用扫描电镜、形貌分析仪和接触角测量仪对成膜后的铝镁合金表面进行形貌和接触角的表征与测量。结果表明：沉积疏水的FDTS和OTS自组装分子膜时，接触角随微结构间距的增大而减小，随微结构高度的增大而增大，最大接触角达156°，形成超疏水铝镁合金表面；沉积亲水的APS自组装分子膜时，接触角随微结构间距的增大而增大，随微结构高度的增大而减小，最小接触角接近0°，形成超亲水铝镁合金表面；激光加工和自组装技术可以大幅度改变铝镁合金的表面润湿性。
关键字: 铝镁合金；微结构；接触角；激光加工；自组装分子膜
（College of Transportation Equipment and Ocean Engineering, Dalian Maritime University, Dalian 116026, China）
Abstract:In order to prepare super-hydrophobic metal surface with higher mechanical intensity and longevity of service, three surface textures including frustum of a cone, notch of taper hole and frustum of a pyramid, were manufactured on Al-Mg alloy with laser surface modification method, and the self-assembled monolayers (SAMs) was deposited on the textured surface with self-assembled method. Scanning electron microscopy, surface profiler and contact angle measurement were used to analyze the surface properties of specimens. The results show that after laser manufacturing and preparing hydrophobicity FDTS and OTS self-assembled monolayers, the contact angles tend to smaller as the increment of the spacing of surface texture, and tend to bigger as the increment of the height of surface texture. Maximum contact angle of 156° and the super-hydrophobic surface can be acquired. After laser manufacturing and preparing hydrophilic APS self-assembled monolayers, the contact angles tend to bigger as the increment of the spacing of surface texture, and tend to smaller as the increment of the height of surface texture. Minimum contact angle of 0° or so and the super-hydrophilic surface can be obtained. The wettability of aluminum-magnesium alloy surface can be adjusted by laser surface modification method and self-assembled monolayers.
Key words: Al-Mg alloy; texture; contact angle; laser modification; self-assembled monolayers
