超疏水镁合金表面制备及耐生物腐蚀性

Super-hydrophobic surface preparation and biological corrosion resistance of magnesium alloy

采用激光加工结合构筑纳米结构,并涂覆低表面能物质的方法制备了镁合金超疏水表面。使用光学显微镜和扫描电镜观察表面形貌,接触角测量仪测量超疏水表面的静态接触角,电化学分析方法测试试样在模拟生物体液中的腐蚀性能。结果表明:激光加工参数对超疏水表面形貌和性能具有重要的影响。当加工电流为13 A,点阵间距为50μm时,表面微/纳米结构均匀,静态接触角达到最大值161.7°。超疏水试样的腐蚀电位增加,极化电阻增大,腐蚀电流降低,腐蚀速率降低31%,有效提高了WE43镁合金的耐生物体液腐蚀性能。

The super-hydrophobic surface of WE43 magnesium alloy was fabricated by laser processing combined with nanostructure and micron structure coated with low surface energy materials. The morphology of the alloy,static contact angle of the super-hydrophobic surface and corrosion resistance of the testing sample in simulated body fluid were investigated by optical microscope,scanning electron microscopy,contact angle measurement and electrochemical impedance spectroscopy. The results show that the laser processing parameters have great influence on the morphology and properties of the super-hydrophobic surface. When the working current is 13 A,the lattice spacing is 50 μm,the nanoparticles dispersion concentration is 15 g/L,the static contact angle of the super-hydrophobic surface reaches the maximum value of 161. 7°,and its corrosion potential and polarization resistance increase,the corrosion current decreases and the corrosion rate decreases by 31%. The super-hydrophobic surface can improve the corrosion resistance of the WE43 magnesium alloy in hanks simulated body fluid.