中文摘要：

采用含有三氯化铁和盐酸的水溶液刻蚀金属黄铜表面,在黄铜表面上得到了一层由不规则块状结构和更细小的乳突状结构相结合的具有双重粗糙度的阶层结构。该表面经氟化处理后表现出超疏水性,水在该表面上的接触角达到了157°,接触角滞后为5°。考察了不同刻蚀时间对表面疏水性的影响,结果表明,刻蚀时间对表面上这种阶层结构的形成和水滴在表面上的接触角数据都有十分重要的影响。随着刻蚀时间的增加,表面上逐渐开始形成粗糙结构,接触角数据也不断增加,增加到一定数值后,接触角变化开始不明显。接触角滞后随着接触角的增加而减小。初步分析了这种阶层结构的形成机制,并用Cassie理论对表面的润湿性进行了分析。

英文摘要：

A hierarchical roughness was fabricated on brass surface by chemical etching with a FeCl3-HCl-H2O solution.The roughness consisted of irregular pieces and fine papilla.After fluorination treating,the brass surface exhibited super-hydrophobic properties,with a water contact angle of about 157° and contact angle hysteresis of about 5°.The effect of etching time on the hydrophobicity of the surfaces was investigated.The results indicated that the etching time played an important role in the formation of hierarchical roughness and of a high contact angle.With the increase of etching time,the hierarchical structure gradually formed on the surface and the contact angle gradually increased until a constant value was reached.The contact angle hysteresis decreased as the contact angle increased.The possible mechanism of the formation of hierarchical roughness was proposed.Also,the wettability of brass surface was discussed on the basis of the Cassie theory.