化学刻蚀制备亲水性铝及润湿性变化规律

发布时间：2018-09-03 13:07

【摘要】：目的通过化学刻蚀的方法制备具有亲水性的纯铝与高纯铝表面,在室温下进行时效,分析润湿性随时效时间的变化规律。方法实验以2 mol/L浓度的盐酸进行刻蚀,将试样分别刻蚀4、8、12、16、20 min,吹干制备好的试样。利用OCA15EC接触角测量仪测定润湿角,将试样放置在室温下进行时效,并记录时效后的润湿角,分析润湿角变化的规律;采用场发射扫描电子显微镜观察试样表面的微观形貌,结合Wenzel理论与Cassie理论分析润湿角变化的原因;对试样进行EDS分析,分析时效后试样所含元素含量的变化情况,阐述润湿性变化的机理。结果不同刻蚀时间制备的样品润湿角存在差异,经过室温时效,润湿角呈现增大的趋势。结论纯铝在刻蚀时间16 min时能够获得超亲水的表面,在室温下时效5天能维持润湿角在20°以下。高纯铝在刻蚀时间为12 min时能够获得超亲水表面,经过5天的室温时效,12 min刻蚀的样品润湿性保持得较为稳定,润湿角维持在12°以下,其他刻蚀时间的样品亲水性及稳定性略差。
[Abstract]:Aim to prepare hydrophilic pure aluminum and high pure aluminum surface by chemical etching and aging at room temperature to analyze the change of wettability time. Methods the samples were etched with hydrochloric acid of 2 mol/L concentration, and the samples were prepared by blowing dry for 4? 8? min,. The wetting angle was measured by OCA15EC contact angle measuring instrument, the sample was aged at room temperature, the wetting angle after aging was recorded, the rule of wetting angle change was analyzed, and the microstructure of the sample surface was observed by field emission scanning electron microscope. The reason of the change of wetting angle was analyzed by combining Wenzel theory with Cassie theory, and the change of the content of elements in the sample after aging was analyzed by EDS, and the mechanism of the change of wettability was expounded. Results the wetting angle of samples prepared at different etching times was different, and the wetting angle increased after aging at room temperature. Conclusion the superhydrophilic surface of pure aluminum can be obtained at the etching time of 16 min, and the wetting angle can be kept below 20 掳after aging at room temperature for 5 days. The ultrahydrophilic surface of high purity aluminum can be obtained when the etching time is 12 min. The wettability of the samples etched at room temperature for 5 days at room temperature for 12 min is stable and the wetting angle is below 12 掳. The hydrophilicity and stability of other etching time samples are slightly poor.
【作者单位】：山东理工大学机械工程学院;
【基金】：国家自然科学基金(51104096)~~
【分类号】：TG176

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