【摘要】：根據(jù)近年來對荷葉、水稻葉等具有超疏水性質(zhì)的表面研究發(fā)現(xiàn),微尺度的粗糙結(jié)構(gòu)是造成表面疏水特性的關(guān)鍵因素。本文以此理論為參考,在現(xiàn)有制備超疏水表面方法基礎(chǔ)上,利用噴砂-電刷鍍的方式在45#鋼和40Cr表面構(gòu)筑出微-納復(fù)合結(jié)構(gòu)。通過對表面微觀形貌的表征發(fā)現(xiàn),表面完全被具有一定間隙分布的“菜花狀”凸包結(jié)構(gòu)覆蓋,粗糙程度也明顯增加。表面潤濕性結(jié)果表明,粗糙結(jié)構(gòu)的存在一定程度上增加了表面結(jié)構(gòu)內(nèi)部對空氣的截取容量,降低了水滴與表面的有效接觸面積,從而增大了表面的疏水程度,在未經(jīng)低表面能物質(zhì)修飾的情況下獲得優(yōu)異的疏水性。通過大量試驗研究對電壓進(jìn)行參數(shù)優(yōu)化,在14V電壓條件下表面具有形貌輪廓清晰,間隙分布均勻的表面結(jié)構(gòu),而此時45#鋼鍍層表面接觸角可以達(dá)到151.8°,40Cr表面的接觸角也達(dá)到148.9°。在3.5wt.%NaCl溶液中腐蝕測試結(jié)果表明,噴砂-電刷鍍方法制備的45#鋼和40Cr表面的腐蝕電流密度與拋光表面、噴砂表面相比分別下降3個和2個數(shù)量級,腐蝕電位正向移動,阻抗顯著增加。同時研究發(fā)現(xiàn),結(jié)合方法制備表面的耐腐蝕性隨著表面疏水性的變化而改變,當(dāng)表面具有最佳疏水特性時,其抗腐蝕性能也相對優(yōu)異。而同時,鹽霧腐蝕測試也表明,試樣表面的耐腐蝕性隨著表面的疏水性而改變,具有最佳疏水特性的表面相對擁有更優(yōu)異的耐腐蝕性能。
[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 擄under the condition of 14V voltage. The contact angle of 40Cr surface is also up to 148.9 擄. 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.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG174.4

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