Mg-Li合金表面浅绿色超疏水复合膜层的制备及耐蚀性能研究  

PREPARATION OF GREENISH SUPER-HYDROPHOBIC DUPLEX-MODIFIED FILM ON Mg-Li ALLOY AND ITS CORROSION RESISTANCE

作　　者：侯文婷[1] 康志新[1] 

机构地区：[1]华南理工大学机械与汽车工程学院国家金属材料近净成形工程技术研究中心,广州510640

出　　处：《中国腐蚀与防护学报》2012年第4期306-310,共5页Journal of Chinese Society For Corrosion and Protection

基　　金：广州市科技支撑计划项目(2009Z2-D811)资助

摘　　要：通过微弧氧化着色技术在Mg-Li合金表面生成浅绿色类陶瓷膜层,并在着色膜表面有机镀膜复合改性。用蒸馏水在镀膜表面的静态接触角以及动电位极化曲线和电化学阻抗谱测试,分别研究复合改性前后润湿性及耐蚀性。结果表明,微弧氧化着色表而通过有机镀膜生长了一层有机薄膜,接触角由近0。变为169.2。,实现了超亲水到超疏水的功能转化。Mg-Li合金基体经微弧氧化着色改性后,耐蚀性能明显提高,经复合改性后耐蚀性能进一步提高;与基体相比,超疏水复合膜在0.1 tool/L NaCl溶液中的动电位极化腐蚀电流密度减小3个数量级,电化学阻抗提高3个数量级。Greenish analogous ceramic coating was obtained on the surface of Mg-Li alloy by micro-arc oxidation （MAO） coloring, then duplex modification was executed through polymer plating on the surface of MAO coloring film. The contact angle of distilled water, potentiodynamic polarization and electrochemical impedance spectroscopy （EIS） were used to characterize the wettability and corrosion resistance before and after duplex modification, respectively. The experimental results showed that the MAO coloring surface is covered by polymeric thin film through polymer plating, and it leads to the change of contact angle from nearly 0° to 169.2°, which indicates the wettability is modified from super-hydrophilic to super-hydrophobic. The MAO coloring film exhibits better corrosion resistance than bare Mg-Li alloy and its corrosion resistance is improved by duplex modification of polymer plating. Compared to bare Mg-Li alloy, the corrosion current density of super-hydrophobic duplex-modified film from potentiodynamic polarization decreases by three orders of magnitude and electrochemical impedance from electrochemical impedance spectroscopy increases by three orders of magnitude in 0.1 mol/L NaCl solution.

关 键 词：MG-LI合金 微弧氧化着色 有机镀膜 复合表面改性 超亲水 超疏水 耐蚀性 

分 类 号：TG174.4[金属学及工艺—金属表面处理] O647.5[金属学及工艺—金属学]