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Construction of ecofriendly anticorrosive composite film ZnAl-LDH by modification of lignin on AA 7075 surface
Materials and Corrosion ( IF 1.8 ) Pub Date : 2021-05-13 , DOI: 10.1002/maco.202112402
Yanhui Cao 1, 2 , Dajiang Zheng 3 , Changjian Lin 1
Affiliation  

In this study, an environment-friendly composite ZnAl-LDH film modified by the rich biomass lignin was prepared on AA 7075 surface successfully. A wide range of characterizations was carried out to obtain the morphology, composition, and structure of this composite film, including scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and so on. In addition, FTIR was used to investigate the complexing interaction between layered double hydroxide (LDH) and lignin. Finally, the corrosion protection ability of this composite film was evaluated by electrochemical impedance spectroscopy in an immersion period of 7 days in NaCl solutions. The results indicated that the ZnAl-LDH film modified by lignin could provide effective corrosion protection for the underlying substrate in the whole immersion period, with almost one order of magnitude higher of the corrosion resistance in comparison with that in the case of the blank ZnAl-LDH film after immersion of 7 days. Such results could provide inspiring insights into the development of composite inhibitors based on LDH and biomass.

中文翻译:

AA 7075表面木质素改性构建生态友好型防腐复合膜ZnAl-LDH

本研究在AA 7075表面成功制备了富含生物质木质素改性的环保复合ZnAl-LDH薄膜。为了获得该复合膜的形貌、组成和结构,进行了广泛的表征,包括扫描电子显微镜、X 射线衍射、傅里叶变换红外光谱 (FTIR) 等。此外,FTIR 还用于研究层状双氢氧化物 (LDH) 和木质素之间的络合相互作用。最后,通过电化学阻抗谱评估该复合膜在 NaCl 溶液中浸泡 7 天的腐蚀保护能力。结果表明,木质素改性的ZnAl-LDH薄膜在整个浸泡过程中都能为下层基体提供有效的腐蚀保护,与空白 ZnAl-LDH 膜相比,浸泡 7 天后的耐腐蚀性能提高了几乎一个数量级。这些结果可以为基于 LDH 和生物质的复合抑制剂的开发提供鼓舞人心的见解。
更新日期:2021-05-13
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