利用十四烷酸溶液化学浸泡的方法改性微弧氧化 AZ31B 镁合金，获得了具有疏水特性的微弧氧化膜。采用接触角测量仪检测膜层的润湿性能；利用SEM、XRD和FT-IR等方法表征膜层的形貌和结构；通过极化曲线和浸泡实验考察样品在3.5% NaCl溶液中的耐蚀性能。结果表明：改性时间从0 h增至5 h时，膜层的静态接触角从0°增加到了138°，膜层的微孔尺寸减小，微孔数量减少；化学改性未改变微弧氧化膜的晶体结构，但改性样品的自腐蚀电位正移，自腐蚀电流密度降低，耐蚀性能得到提高，且疏水性和耐蚀性随着烷基链的增长而增强。氧化膜表面微观多孔的结构促进低表面能烷基羧酸的润湿铺展，烷基链通过双配位键合作用形成单分子层，封闭或缩小微孔，致密微弧氧化膜，并赋予其疏水特性，进一步提高微弧氧化膜对镁合金的腐蚀防护能力。
A hydrophobic surface was fabricated on a micro-arc oxidation (MAO) treated AZ31 Mg alloys via surface modification with myristic acid. The effects of modification time on the wettability of the coatings were investigated using the contact angle measuring device. The surface morphologies and structure of the coatings were evaluated using SEM, XRD and FT-IR. The corrosion resistance was investigated by potentiodynamic polarization curves and long-term immersion test. The results showed that the water contact angle (CA) increases gradually with modification time from 0 to 5 h, the highest CA reaches 138° after being modified for 5 h, and the number and size of the micro pores are decreased. The modification method hardly alters crystalline structure of the MAO coating, but improves the corrosion resistance based on the much positive potential and low current density. Moreover, the corrosion resistance and hydrophobicity can be enhanced with increasing the alkyl chain. The wetting and spreading for the alkylcarboxylate with low surface energy become easier on the micro-porous surface, and alkylcarboxylate monolayer will be formed through bidentate bonding, which changes the surface micropores to a sealing or semi-sealing structure and makes the MAO coating dense and hydrophobic. All the results demonstrate that the modification process improves the corrosion protection ability of the MAO coating on AZ31B Mg alloy.
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