School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P.R. China.
ACS Appl Mater Interfaces. 2012 Aug;4(8):4348-56. doi: 10.1021/am3009949. Epub 2012 Aug 7.
A novel method for controllable fabrication of a superhydrophobic CuO surface on AZ91D magnesium alloy is reported in this paper. Hierarchical structure composed of micro/nano-featherlike CuO was obtained by electrodeposition of Cu-Zn alloy coating and subsequently an electrochemical anodic treatment in alkaline solution. After modification with lauric acid, the surface became hydrophobicity/superhydrophobicity. The formation of featherlike CuO structures was controllable by varying the coating composition. By applying SEM, ICP-AES, and water contact angle analysis, the effects of coating composition on the surface morphology and hydrophobicity of the as-prepared surfaces were detailedly studied. The results indicated that at the optimal condition, the surface showed a good superhydrophobicity with a water contact angle as high as 155.5 ± 1.3° and a sliding angle as low as about 3°. Possible growth mechanism of featherlike CuO hierarchical structure was discussed. Additionally, the anticorrosion effect of the superhydrophobic surface was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) measurements. The interface model for anticorrosion mechanism of superhydrophobic surface in corrosive medium was proposed. Besides, the mechanical stability test indicated that the resulting superhydrophobic surfaces have good mechanical stability.
本文报道了一种在 AZ91D 镁合金上可控制备超疏水 CuO 表面的新方法。通过铜锌合金涂层的电沉积和随后在碱性溶液中的电化学阳极处理，获得了由微/纳米羽毛状 CuO 组成的分层结构。经过月桂酸修饰后，表面变得具有疏水性/超疏水性。通过改变涂层成分，可以控制羽毛状 CuO 结构的形成。通过 SEM、ICP-AES 和水接触角分析，详细研究了涂层成分对所制备表面的表面形貌和疏水性的影响。结果表明，在最佳条件下，表面表现出良好的超疏水性，水接触角高达 155.5±1.3°，滑动角低至约 3°。讨论了羽毛状 CuO 分级结构的可能生长机制。此外，通过动电位极化和电化学阻抗谱（EIS）测量研究了超疏水表面的耐腐蚀效果。提出了超疏水表面在腐蚀性介质中耐腐蚀机理的界面模型。此外，机械稳定性测试表明，所得的超疏水表面具有良好的机械稳定性。
