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论文类型：期刊论文

发表时间：2011-09-01

发表刊物：JOURNAL OF MATERIALS SCIENCE

收录刊物：Scopus、SCIE、EI

卷号：46

期号：18

页面范围：5925-5930

ISSN号：0022-2461

摘要：A superhydrophobic surface with a water contact angle of 166.0A degrees and a tilting angle of 1.5A degrees was fabricated on an aluminum substrate by electrochemical machining using neutral NaNO3 electrolytes, followed by fluorination. The fabrication process is based on the fact that the grain boundaries and dislocations on aluminum are anodic dissolved before the grain itself by an applied electric field. Using scanning electron microscopy to analyze surface morphology, micrometer scale caves, and protrusions were found on the surface, with numerous nanometer mastoids contained in the protrusions. These binary micro-nano rough structures, which are similar to the micro-structures of a lotus leaf surface, play an important role in achieving superhydrophobicity. The effects of processing time, processing current, and electrolyte concentration on superhydrophobicity were also examined. The results show that electrochemical machining does not require rigid processing parameters, uses a simple device, and is highly efficient and environmental friendly. The optimum processing conditions are a processing time of 60 min, a processing current of 250 mA, and an electrolyte of 0.15 mol/L.