| 摘要: |
| 通常在氧化铝表面添加有机镀层，可以大幅降低其表面能。有机镀层具有附着力低、不稳定及污染环境等缺陷。PAOF(多孔氧化铝薄膜)在仿生学上具有类似自然界低表面能生物的表面微结构，本研究通过对其进行加热冷却等处理方法，达到提高其表面接触角的目的。通过SEM观察，制得的低表面能材料具有约176 nm孔径的规则光滑多孔结构。表面元素分析表明加热处理后和处理前的表面具有一致的化学组成。推断是加热冷却过程使阳极氧化生成的铝氢氧化物和水合物复合结构发生失水，从而露出基底部规则的多孔结构。根据计算，当多孔表面的孔径约为176nm时，孔中的水滴表面张力和孔隙大气压力将和水滴重力形成力学平衡，从而使水滴不渗透到孔隙中。电化学实验结果表明，低表面能多孔氧化铝比普通氧化铝具有更低的腐蚀电流。 |
| 关键词: 多孔氧化铝薄膜(PAOF), 低表面能, 微结构, 耐腐蚀 |
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| 基金项目:中国科学院战略先导专项子课题(XDA13040403)；中国科学院基础前沿科学研究计划从0到1原始创新项目(ZDBS-LY-DQC025) |
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| Preparation of low surface energy aluminum oxide film under temperature-controlled heating and its corrosion protection study |
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Zheng Meng1, Liu Fanghao2, Lu Dongzhu3, Zhu Qingjun4
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1.Center for Ocean Mega-Science, China Academy of Sciences;2.Shandong North Chuangxin Waterproof Science and Technology Group Co., Ltd;3.Research and Development Center of Marine Science and Technology, Institute of Oceanology, Nantong;4.Key laboratory of Marine Environment Corrosion and Fouling, Institute of Oceanology, China Academy of Sciences
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| Abstract: |
| By adding organic coatings, the wettability of alumina can be greatly increased. However, organic coating has many disadvantages such as instable adhesion, environmental pollution etc. The surface morphology of PAOF is similar to some low wettability surface in natural world, and in this research, the wettability of PAOF can be reduced further by heating and cooling. Through SEM observation, the surface of low wettability specimens has regular porous structure with diameter 176 nm. Through surface elemental analysis, the surface has a similar chemical composition before and after heat treatment. Maybe heating and cooling process cause the anodic oxidation of aluminum hydroxide and hydrate of composite structure lose water, exposing the basic porous structure. According to the calculation, when the diameter of porous surface appears around 176nm, the water surface tension and pore air pressure in the hole will have a balance to the gravity of the water droplet, so that the water hardly penetrates into the pores. By the electrochemical experiment, low wettability alumina has lower current than normal alumina. |
| Key words: Porous anodic oxide film, Low wettability, Microstructure, Anti-corrosion |