超疏水钢表面的制备及其抗结霜性能  

Fabrication of superhydrophobic steel surface and its anti-frosting performance

作　　者：张友法[1,2] 余新泉[1,2] 周荃卉[1,2] 李康宁[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省先进金属材料高技术研究重点试验室,南京211189

出　　处：《东南大学学报（自然科学版）》2010年第6期1318-1322,共5页Journal of Southeast University：Natural Science Edition

基　　金：东南大学人才引进科研启动基金资助项目(4012001110)

摘　　要：为了改善传统钢铁表面较差的抗结霜性能,对钢片表面先后进行高能微米喷丸处理和氟化处理,采用扫描电子显微镜、接触角测量仪和抗结霜试验设备研究了钢片表面形貌、浸润性和抗结霜性能的变化.结果表明,高能微米喷丸处理在钢片表面成功构建了微米-纳米复合结构,且喷丸尺寸越细小,得到的微观结构越细小均匀.喷丸-氟化复合处理后,钢片表面与水滴接触角可高达160,°滚动角小于2°,显示出超疏水性和低黏附性.低温结霜试验表明,制备的超疏水钢片在试验过程中只有少量的霜晶出现,而未经处理的钢片已形成霜层.分析认为超疏水钢表面与水滴间的热量交换较小,水滴不易凝结,从而有效地提高了抗结霜性.抗结霜性良好的超疏水钢有望在热交换器或低温运行设备等领域获得应用.In order to improve anti-frosting performance of steel,the surface of steel specimens were treated by sandblasting and fluorination.Morphology,wettability and anti-frosting performance of the surface were observed and characterized by SEM（scanning electronic microscopy）,contact angle measurement system and anti-frosting testing system.The results show that micro-and nano-scale structures are successfully fabricated on steel surfaces by sandblasting.The morphology can be refined by decreasing the sandblasting particle size.The sandblasted surface after fluorination displays high water contact angle of 160° and ultra-low water roll angle of 2°,which is superhydrophobic and low-adhesive.It is also found that only a few frost formed in the superhydrophobic surface from the experimental results of anti-frosting.In contrast,a thick ice layer was observed on the surfaces without any treatment.Heat transfer between the treated surface and water droplets is difficult to proceed under low temperature,resulting in the difficulty of water condensation on fabricated superhydrophobic surface.This is thought to be the main reason of the improvement of frost resistance.Superhydrophobic steel with excellent anti-frosting performance can be widely used in many fields such as heat exchanger and products operating under low temperature.

关 键 词：钢 喷丸处理 超疏水 抗结霜 

分 类 号：O647[理学—物理化学]