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首页> 外文期刊>RSC Advances >Hierarchically organized Li–Al-LDH nano-flakes: a low-temperature approach to seal porous anodic oxide on aluminum alloys
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Hierarchically organized Li–Al-LDH nano-flakes: a low-temperature approach to seal porous anodic oxide on aluminum alloys

机译：分层组织的Li-Al-LDH纳米薄片：一种低温方法，用于密封铝合金上的多孔阳极氧化物

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摘要

This work suggests a low-temperature sealing approach for tartaric–sulfuric acid (TSA) anodized AA2024 based on hierarchically organized Li–Al-layered double hydroxide (LDH) structures. The new proposed sealing is expected to be directly competitive to the standard hot water sealing (HWS) approaches because of its reduced treatment temperature and high protection efficiency. A hierarchical organization of in situ formed LDH nano-flakes across the depth length of the TSA pores, from the macrodown to the nano-size range, was observed with transmission electron microscopy (TEM). Electrochemical impedance spectroscopy (EIS) studies showed that the densely packed LDH arrangement at the porous oxide layer is directly related to the drastically improved barrier properties of TSA. Moreover, LDH flake-like structures worked as “smart” reservoirs for corrosion inhibiting vanadium species (VOx) that are released on demand upon the onset of corrosion. This was confirmed using a scanning vibrating electrode technique (SVET), giving relevant insights into the time-resolved release activity of VOx and the formation of the passivation layer on cathodic intermetallics, corroborated with EDX and analytical Raman spectroscopy. Passive and active corrosion protection was imparted to the anodic layer via new Li–Al-LDH structures with long-term protection exceeding that of standard HWS procedures.
机译：这项工作提出了基于分层组织的锂铝层双氢氧化物（LDH）结构的酒石酸-硫酸（TSA）阳极氧化AA2024的低温密封方法。由于降低的处理温度和较高的保护效率，新提出的密封有望与标准的热水密封（HWS）方法直接竞争。用透射电子显微镜（TEM）观察到了从大孔到纳米尺寸范围的，在整个TSA孔的深度范围内形成的LDH纳米薄片的分层组织。电化学阻抗谱（EIS）研究表明，在多孔氧化物层上紧密堆积的LDH排列与TSA的阻隔性能大大提高直接相关。此外，LDH片状结构充当了“智能”储藏室，用于缓蚀钒物质（VO x ），该钒在需要时释放。腐蚀的开始。使用扫描振动电极技术（SVET）对此进行了确认，从而对VO x 的时间分辨释放活性和形成提供了相关见解钝化层在阴极金属间化合物上的分布，通过EDX和分析拉曼光谱得到证实。通过新的Li-Al-LDH结构对阳极层进行了被动和主动腐蚀防护，其长期防护超过了标准HWS程序。

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