喷砂—电沉积构筑钢基疏水表面及其耐腐蚀性能研究

发布时间：2019-03-15 10:41

【摘要】：根据近年来对荷叶、水稻叶等具有超疏水性质的表面研究发现,微尺度的粗糙结构是造成表面疏水特性的关键因素。本文以此理论为参考,在现有制备超疏水表面方法基础上,利用喷砂-电刷镀的方式在45#钢和40Cr表面构筑出微-纳复合结构。通过对表面微观形貌的表征发现,表面完全被具有一定间隙分布的“菜花状”凸包结构覆盖,粗糙程度也明显增加。表面润湿性结果表明,粗糙结构的存在一定程度上增加了表面结构内部对空气的截取容量,降低了水滴与表面的有效接触面积,从而增大了表面的疏水程度,在未经低表面能物质修饰的情况下获得优异的疏水性。通过大量试验研究对电压进行参数优化,在14V电压条件下表面具有形貌轮廓清晰,间隙分布均匀的表面结构,而此时45#钢镀层表面接触角可以达到151.8°,40Cr表面的接触角也达到148.9°。在3.5wt.%NaCl溶液中腐蚀测试结果表明,喷砂-电刷镀方法制备的45#钢和40Cr表面的腐蚀电流密度与抛光表面、喷砂表面相比分别下降3个和2个数量级,腐蚀电位正向移动,阻抗显著增加。同时研究发现,结合方法制备表面的耐腐蚀性随着表面疏水性的变化而改变,当表面具有最佳疏水特性时,其抗腐蚀性能也相对优异。而同时,盐雾腐蚀测试也表明,试样表面的耐腐蚀性随着表面的疏水性而改变,具有最佳疏水特性的表面相对拥有更优异的耐腐蚀性能。
[Abstract]:Based on the surface studies of lotus leaves and rice leaves in recent years, it is found that micro-scale rough structure is the key factor to cause the surface hydrophobicity of lotus leaves and rice leaves. In this paper, a micro-nano composite structure was fabricated on the surface of 45 # steel and 40Cr by sand blasting and brush plating on the basis of the existing methods of preparing superhydrophobic surface. It was found that the surface was completely covered by the "cauliflower-like" convex envelope structure with a certain gap distribution, and the roughness of the surface was also significantly increased by the characterization of the surface micromorphology. The results of surface wettability show that the presence of rough structure increases the interception capacity of air in the surface structure to a certain extent, reduces the effective contact area between the droplets and the surface, and thus increases the hydrophobic degree of the surface. Excellent hydrophobicity was obtained without modification of low surface energy substances. Through a large number of experiments, the parameters of the voltage were optimized. Under the condition of 14V voltage, the surface structure with clear morphology and uniform gap distribution was obtained. However, the contact angle on the surface of 45 # steel coating could reach 151.8 掳under the condition of 14V voltage. The contact angle of 40Cr surface is also up to 148.9 掳. The results of corrosion test in 3.5wt.%NaCl solution show that the corrosion current density of 45 # steel and 40Cr surface prepared by sand blasting-brush plating method is 3 and 2 orders of magnitude lower than that of polished surface and sand blasting surface, respectively. The corrosion potential moves in a positive direction and the impedance increases significantly. At the same time, it is found that the corrosion resistance of the surface prepared by the combination method changes with the change of the surface hydrophobicity. When the surface has the best hydrophobic property, the corrosion resistance of the surface is also relatively excellent. At the same time, the salt spray corrosion test also showed that the corrosion resistance of the sample surface changed with the surface hydrophobicity, and the surface with the best hydrophobic property had better corrosion resistance.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG174.4

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