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聚多巴胺包裹的碳纳米管用于改善聚氨酯涂层的防腐蚀性能。

Polydopamine-wrapped carbon nanotubes to improve the corrosion barrier of polyurethane coating.

作者信息

Cai Guangyi, Hou Jian, Jiang Dan, Dong Zehua

机构信息

Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology Wuhan 430074 China

Luoyang Ship Material Research Institute, State Key Laboratory for Marine Corrosion and Protection Qingdao 266273 China.

出版信息

RSC Adv. 2018 Jun 29;8(42):23727-23741. doi: 10.1039/c8ra03267j. eCollection 2018 Jun 27.

DOI:10.1039/c8ra03267j
PMID:35540283
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9081770/
Abstract

Nanocomposite reinforced polyurethane (PU) coatings have been prepared by an ultrasonication method with polydopamine-wrapped carbon nanotubes (PDA@CNTs) as the nanofiller. The influence of the PDA@CNTs enhanced PU coating on the corrosion resistance and adhesion strength to Al-alloy was investigated by electrochemical impedance spectroscopy and the pull-off test during cyclic ageing tests, including the salt spraying test, UV irradiation and solution immersion. A comparison of the pristine PU against CNTs modified PU coatings revealed that the higher CNTs loading (2.0 wt%) increased the heterogeneity and porosity of PU, which could deteriorate the corrosion barrier of PU due to the poor dispersity, even though it also increased the adhesion strength of PU. In contrast, the PDA wrapped CNTs could improve the dispersibility of the CNTs in the PU matrix thanks to the greater compatibility of PDA with PU compared to CNTs. Further experiments indicated that increasing the PDA@CNTs loading could improve the adhesion strength, but and also increase the corrosion resistance of the PU coating to 10 Ω cm even after 7 cycles of ageing tests. Morphological observations indicated that the PDA@CNTs could increase the compactness and decrease the defects of PU, preventing the initiation and propagation of micro-defects in the PU coating during long-term ageing tests.

摘要

采用超声法，以聚多巴胺包裹的碳纳米管（PDA@CNTs）为纳米填料制备了纳米复合增强聚氨酯（PU）涂层。通过电化学阻抗谱以及在包括盐雾试验、紫外线照射和溶液浸泡在内的循环老化试验中的拉拔试验，研究了PDA@CNTs增强PU涂层对铝合金耐腐蚀性和附着力的影响。将原始PU与碳纳米管改性PU涂层进行比较发现，较高的碳纳米管负载量（2.0 wt%）增加了PU的不均匀性和孔隙率，由于分散性差，这可能会降低PU的防腐蚀性能，尽管它也提高了PU的附着力。相比之下，由于PDA与PU的相容性比碳纳米管与PU的相容性更好，聚多巴胺包裹的碳纳米管可以提高碳纳米管在PU基体中的分散性。进一步的实验表明，增加PDA@CNTs的负载量可以提高附着力，而且即使经过7个循环的老化试验，PU涂层的耐腐蚀性也能提高到10 Ω·cm。形态观察表明，PDA@CNTs可以增加PU的致密性并减少缺陷，在长期老化试验中防止PU涂层中微缺陷的产生和扩展。

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