超疏水镁合金制备及其耐腐蚀性研究

Research on Preparation and Corrosion-reistance of Super-hydrophobic Mg alloys

摘要:

本文报导了两种化学试剂和两种表面改性剂,通过4种不同的组合方式在镁合金表面制备超疏水膜层的简单方法。先分别使用氯化铜和硫酸锌对镁合金进行化学刻蚀,再通过油酸和硬脂酸对其进行表面修饰。改性以后试样的静态接触角均达到150°以上,滚动角在6.5°左右；且试样的超疏水性能保持稳定,在空气中暴露半年之久后,其接触角依然保持在150°以上,变化幅度非常小。对四种不同的超疏水试样进行电化学测试,比较发现采用氯化铜刻蚀后经过硬脂酸自组装得到的超疏水表面拥有最好的耐腐蚀性,其自腐蚀电位达到-1.11V,相比于镁合金基体提高了0.33V,且容抗弧直径是基体的6-7倍。

Abstract:

Four simple methods of fabricating a super-hydrophobic film on magnesium alloy through the employment of two chemical reagents and two surface modifiers are reported in the paper. The Mg alloys are chemically etched by CuCl2 or ZnSO4 first and then modified with low surface energy material of oleic acid or stearic acid. After modification, the obtained samples show super-hydrophobicity with static contact angle to reach more than 150 ° and the sliding angle of about 6.5 °. The super-hydrophobicity of obtained samples are stable; the water contact angle remains above 150 ° after being exposed in air for six months. Compared with the electrochemical properties of four super-hydrophobic samples, it can be found that the sample that is etched by CuCl2 and then self-assembled by stearic acid has the best corrosion resistance with the corrosion potential Ecorr improved by 0.33V, reaching to -1.11V. The diameter of capacitive arc is also 6-7 times than substrate.