Facile electrodeposition of superhydrophobic aluminum stearate thin films on copper substrates for active corrosion protection
Facile electrodeposition of superhydrophobic aluminum stearate thin films on copper substrates for active corrosion protection
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DOI：
10.1016/j.surfcoat.2019.02.070
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发表时间：
2019-04
影响因子：
5.4
通讯作者：
W. Xu;Karthikeyan Rajan;X. Chen;D. Sarkar
中科院分区：
文献类型：
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作者：
W. Xu;Karthikeyan Rajan;X. Chen;D. Sarkar
以异丙醇铝（AlOx）和硬脂酸（SA）为原料，采用一步法在铜基底上制备了一种铝基超疏水薄膜。利用X射线能量色散谱（EDS）和衰减全反射傅里叶透射红外光谱（ATR-FTIR）分析了薄膜中Al、C、O以及COO单键Al和C单键H键的存在。通过测量接触角来分析水滚特性，以研究所制备的膜的超疏水性质。结果表明，当AlOx/SA摩尔比为0.33时，该复合材料具有超疏水性，水接触角为161 ± 1°，接触角滞后为2 ± 1°。在铜衬底上制备的薄膜表面形貌为均匀的多孔结构，表面粗糙度（rms）为3 μm。硬脂酸的加入对超疏水性能起着重要作用。在3.5wt%NaCl腐蚀性水溶液中考察了薄膜的耐蚀性能。薄膜的极化电阻为962 kΩ·cm 2。同样，从电化学阻抗谱（EIS）获得10 MΩ·cm 2的阻抗值。制备工艺简单的憎水性超疏水铝基涂层具有极高的防腐活性。
A facile aluminum based superhydrophobic thin films were electrodeposited by mixing aluminum isopropoxide (AlOx) with stearic acid (SA) onto the copper substrates via one-step method. The energy dispersive X-ray spectroscopy (EDS) attenuated total-reflectance Fourier Transmission infrared spectroscopy (ATR-FTIR) were used to confirm the presence of Al, C, and O as well as COOsingle bondAl and Csingle bondH bonds in the thin film. The water-roll off properties were analyzed by measuring the contact angle to study the superhydrophobic nature of fabricated films. Results show that superhydrophobicity with the water contact angle of 161 ± 1° and the contact angle hysteresis of 2 ± 1° were obtained with respect to the AlOx/SA molar ratio of 0.33. The morphology of the fabricated thin films consisted of uniform porous structures with surface roughness (rms) of 3 μm on the copper substrate. The addition of stearic acid plays an important role for the superhydrophobic property. Furthermore, the thin films and their anticorrosion behavior were investigated using 3.5 wt% corrosive aqueous NaCl electrolyte solution. The polarization resistance of the thin film is found to be 962 kΩ·cm2as characterized by Tafel. Similarly, impedance value of 10 MΩ·cm2was obtained from Electrochemical Impedance Spectroscopy (EIS). A simple fabrication of water-repellent superhydrophobic aluminum-based coating endues extremely high active in corrosion protection.