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Oil-Impregnated Nanoporous Oxide Layer for Corrosion Protection with Self-Healing

机译：含油的纳米多孔氧化物层，具有自愈防腐蚀功能

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摘要

The major drawback of current passivation techniques for preventing corrosion is the lack of ability to withstand any external damages or local defects. In this study, oil-impregnated nanoporous anodic aluminum oxide (AAO) layers are investigated to overcome such limitations and thus advance corrosion protection. By completely filling hydrophobized nanopores with oil via a solvent exchange method, a highly water-repellent surface that prevents the penetration of corrosive media into the AAO layer and hence the corrosion of aluminum is achieved. The impregnation of oil into the hydrophobic nanoporous AAO layer enhances the corrosion resistance of an AAO layer by two and four orders of magnitude compared to that of a hydrophobic (i.e., air-entrained) and a bare (hydrophilic) AAO, respectively. In the presence of local defects, the oil impregnated within the hydrophobic nanoporous AAO layer naturally permeates into the defects and ultimately inhibits the exposure of the aluminum surface to corrosive media. Whereas the corrosion current density of the air-entrained hydrophobic AAO layer increases by more than 30 times after cracks, that of the oil-impregnated AAO layer increases by no more than 4 times, showing superior anticorrosion property even after there are cracks, owing to the effective self-healing capability.
机译：当前用于防止腐蚀的钝化技术的主要缺点是缺乏承受任何外部损坏或局部缺陷的能力。在这项研究中，油浸渍的纳米多孔阳极氧化铝（AAO）层进行了研究，以克服这种局限性，从而提高防腐性能。通过通过溶剂交换方法将疏水化的纳米孔完全充满油，可以形成高度憎水的表面，从而防止腐蚀性介质渗透到AAO层中，从而防止了铝的腐蚀。与疏水性（即，空气夹带的）和裸露的（亲水性）AAO相比，将油浸渍到疏水性纳米多孔AAO层中使AAO层的耐腐蚀性分别提高了两个和四个数量级。在存在局部缺陷的情况下，浸渍在疏水性纳米多孔AAO层中的油会自然渗透到缺陷中，并最终抑制铝表面暴露于腐蚀性介质。空气中的疏水性AAO层在开裂后的腐蚀电流密度增加了30倍以上，而油浸的AAO层的腐蚀电流密度增加了不超过4倍，即使在出现裂缝后，由于腐蚀原因，其防腐性能也优越。有效的自我修复能力。

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  • 来源
    《Advanced Functional Materials》 |2017年第15期|1606040.1-1606040.11|共11页
  • 作者

    Lee Junghoon; Shin Sangwoo; Jiang Youhua; Jeong Chanyoung; Stone Howard A.; Choi Chang-Hwan;

  • 作者单位

    Stevens Inst Technol, Dept Mech Engn, Castle Point On Hudson, NJ 07030 USA;

    Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA;

    Stevens Inst Technol, Dept Mech Engn, Castle Point On Hudson, NJ 07030 USA;

    Stevens Inst Technol, Dept Mech Engn, Castle Point On Hudson, NJ 07030 USA;

    Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA;

    Stevens Inst Technol, Dept Mech Engn, Castle Point On Hudson, NJ 07030 USA;

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