铜基超疏水膜的制备及其在干湿交替环境下的抗腐蚀行为研究

Preparation of superhydrophobic film on copper substrate and its anticorrosion behaviors under dry/wet alternative environment

通过对铜基表面进行电沉积得到微纳米粗糙化铜,再通过多巴胺键联低表面能物质(十二硫醇)最终得到超疏水膜层,该膜层接触角达150°以上,低频阻抗达106.1Ω·cm^2,比裸铜增加2.4个数量级,阳极极化电流降低到1.02×10-8 A/cm^2,表现出较好的抗腐蚀能力。模拟海洋潮差区将其置于干湿交替环境下研究其抗腐蚀行为,同时与干及湿环境下相同周期对比,发现干湿交替环境下腐蚀最为严重。经过28个干湿交替周期后,该膜层整体破坏较小,低频区阻抗值略有降低,但仍具有较好的抗腐蚀性能。

In this study,the superhydrophobic film with a water contact angle above 150°was realized on copper substrate by electrodepositing micro-and nanostructured copper followed by modification of 1-dodecanethiol.The electrochemical impedance spectroscopy result with the impedance value of about 10^6.1Ω·cm^2 which increases by 2.4order of magnitude than bare copper in the low frequency region,and the potentiodynamic polarization measurements with a anodic polarization current density of about 1.02×10^-8 A/cm^2,which indicate that the film shows excellent corrosion resistance performance.The superhydrophobic film treated under dry/wet alternative conditions to simulate marine tidal range zone environment has the lowest anticorrosion property compared with the anticorrosion behaviors in dry and wet conditions.The results of the elelctrochemical tests demonstrate that the film still presents good anti-corrosion ability after dry/wet alternative 28 cycles,with nearly integral morphology and slightly smaller impedance.