Zhu Min, Tang Wenchuan, Huang Luyao, Zhang Dawei, Du Cuiwei, Yu Gaohong, Chen Ming, Chowwanonthapunya Thee
School of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
Materials (Basel). 2017 Jun 8;10(6):628. doi: 10.3390/ma10060628.
Superhydrophobic films were fabricated on a titanium substrate with or without anodizing by using a self-assembling method. Firstly, the pretreatments of mechanical polishing/anodizing or mechanical polishing only were conducted, respectively. Subsequently, the preparation of polydopamine film layer, deposition of nano-silver particles, and post modification of 1H,1H,2H,2H-perfluorodecanethiol were performed on the surface of the pretreated substrate. The surface morphologies, compositions, wettability, and corrosion resistance of the films were investigated with scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), water contact angle measurements, and electrochemical tests, respectively. Meanwhile, the effect of the deposition time in the silver nitrate solution on the hydrophobicity of the specimen surface was investigated. The result showed that with the increase of deposition time, the hydrophobic property enhanced gradually. The surface deposited for 7 h exhibited an optimum hydrophobic effect, which was characterized with a large water contact angle (WCA) of 154°, and the surface was rather rough and covered by a relatively uniform layer of micro-nano silver particles. The excellent hydrophobicity was attributed to a rough stratified microstructure along with the low surface energy. The electrochemical measurements showed that the existence of the superhydrophobic film can effectively enhance the corrosion resistance of Ti samples.
通过自组装方法在经过或未经过阳极氧化处理的钛基底上制备超疏水薄膜。首先，分别进行机械抛光/阳极氧化或仅机械抛光的预处理。随后，在预处理后的基底表面依次进行聚多巴胺薄膜层的制备、纳米银颗粒的沉积以及1H,1H,2H,2H-全氟癸硫醇的后修饰。分别利用扫描电子显微镜（SEM）、能谱仪（EDS）、水接触角测量以及电化学测试对薄膜的表面形貌、成分、润湿性和耐腐蚀性进行研究。同时，研究了硝酸银溶液中沉积时间对试样表面疏水性的影响。结果表明，随着沉积时间的增加，疏水性逐渐增强。沉积7小时的表面呈现出最佳疏水效果，其特征在于具有154°的大水接触角（WCA），且表面相当粗糙并覆盖有相对均匀的微纳米银颗粒层。优异的疏水性归因于粗糙的分层微观结构以及低表面能。电化学测量表明，超疏水薄膜的存在能够有效提高钛样品的耐腐蚀性。
