金属锌表面超疏水薄膜的制备及其摩擦学性能

doi:10.3724/SP.J.1077.2012.00390

摘要/Abstract

摘要：

通过简单两步法在金属锌表面构筑超疏水薄膜, 锌片首先经N,N-二甲基甲酰胺(DMF)处理在表面构筑微纳结构薄膜, 然后在表面覆盖硬脂酸薄膜以实现超疏水. 采用扫描电子显微镜, 傅里叶红外光谱仪和接触角测量仪等手段表征了超疏水表面的形成机制和表面形貌, 并利用微纳米摩擦磨损试验机研究了超疏水薄膜的减摩耐磨特性. 研究结果发现, 在锌表面形成了一层纳米棒状结构的超疏水薄膜, 水的接触角可达155^o. 超疏水薄膜具有明显的减摩和耐磨特性, 这可归因于DMF处理导致的表面微织构化效应以及脂肪酸自组装薄膜的纳米润滑效应.

关键词: 超疏水, 锌, 摩擦, 薄膜

Abstract:

The super-hydrophobic films on Zinc (Zn) substrate were fabricated by a simple two-step process. Firstly, nano-structured film was created to roughen Zn surface by solution oxidation process in the presence of N, N,-dimethylformamide (DMF). Resultant roughened Zn surface was then overcoated with stearic acid to achieve superhydrophobicity. Scanning electron microscope, FT-IR microscope and water contact angle measurement were performed to characterize the morphological feature, chemical composition and super-hydrophobicity of the surface. The resulting surfaces with uniform and packed nanorod structure have a water contact angle as high as about 155^o and provide effective friction-reducing and wear protection for Zn substrate, due to the combined beneficial effects of nanotexturing of DMF treatment and nanolubrication of self-assembled stearic acid overcoat.

Key words: superhydrophobicity, Zn, friction, film

中图分类号:

万勇, 王中乾, 刘义芳. 金属锌表面超疏水薄膜的制备及其摩擦学性能[J]. 无机材料学报, 2012, 27(4): 390-394.

WAN Yong, WANG Zhong-Qian, LIU Yi-Fang. Fabrication and Tribological Performance of Superhydrophobic Film on Zinc Substrate[J]. Journal of Inorganic Materials, 2012, 27(4): 390-394.

图/表 6

图1 未处理锌片(a)和锌片在DMF水溶液中65℃浸液24 h的SEM照片

Fig. 1 SEM images of Zn substrate (a) before and (b) after DMF treatment at 65℃ for 24?h

图2 DMF处理前后锌片表面沉积硬脂酸的水接触角随浸泡时间的变化曲线

Fig. 2 Water contact angle of stearic acid deposited on both bare and oxidized zinc substrates as a function of the duration of the immersion time at room temperature

图3 未处理和DMF处理后Zn基底在硬脂酸溶液中浸泡24?h后薄膜的红外光图谱

Fig. 3 IR spectra of Zn with and without DMF treatment dipped into stearic acid solution for 24?h

图4 未处理及DMF处理后金属锌的摩擦特性曲线

Fig. 4 Friction coefficient of Zn with and without DMF treatment

图5 未处理锌表面硬脂酸薄膜的摩擦特性曲线

Fig. 5 Friction coefficient of stearic acid films on untreated Zn substrate

图6 DMF处理后Zn表面的硬脂酸薄膜的摩擦特性曲线

Fig. 6 Friction coefficient of stearic acid films on Zn substrate treated by DMF

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