石墨烯取向对复合涂层中渗透性和腐蚀起始的影响
The effect of graphene orientation on permeability and corrosion initiation under composite coatings
AI总结：
本研究提出一种模型，通过分析石墨烯取向对复合涂层中腐蚀起始时间的影响，发现石墨烯片与基材之间角度减小可显著延缓腐蚀起始。
摘要：
石墨烯独特的各向异性特性，特别是其不渗透性，使其成为进一步推进防蚀应用的有前途的候选材料。尽管已有大量实验研究揭示了石墨烯在防腐涂料中的应用，但目前尚无关于在复合涂层中石墨烯片取向与引入的防腐保护效率之间关系的数值建模和模拟的报告，据我们所知。本文尝试建模石墨烯片分散在有机涂层中对腐蚀性物质的扩散性和通量以及被保护基材的腐蚀起始时间的影响。为了发现石墨烯取向与腐蚀相关现象之间的关系，本研究引入了一个新的模型，包含一个名为“未保护投影表面积比例”的三角函数因子，该因子基于主菲克定律计算腐蚀相关参数。该模型揭示了石墨烯片与基材之间角度的减小对延迟腐蚀起始具有高度有益的作用。因此，估计石墨烯片与基材之间存在10度的错位角可以显著减缓扩散过程，并在100微米厚的环氧/石墨烯复合涂层中将腐蚀起始时间延迟约65倍，与垂直对齐的对照组相比。预测的腐蚀参数与实验数据良好一致，表明了所提出模型的优越性。因此，该模型可以进一步用作未来研究防腐复合涂层中最佳石墨烯取向的基础。
英文摘要：
The unique anisotropic properties of graphene, particularly impermeability, have made it a promising candidate for further advances in corrosion prevention applications. Despite the large number of experimental works divulging the use of graphene in anticorrosion coatings, there is no report on the numerical modelling and simulation of the relationships between the orientation of graphene sheets in composite coatings and the introduced corrosion protection efficiency, to our knowledge. Herein, it is tried to model the influence of the orientation of graphene sheets dispersed in organic coatings on the diffusivity and flux of corrosive substances besides the corrosion initiation time of the protected substrates. To discover the relationship between the graphene orientation and corrosion-related phenomena, this study introduces a novel model consisting of a trigonometric factor named unprotected projected surface area proportion, which calculates corrosion-related parameters based on the principal Fick's laws. The model reveals that the decrease in the angle between graphene sheets and the substrate is highly beneficial for postponing the corrosion onset. It is accordingly estimated that a mismatch angle of 10 degree can slow down the diffusion process significantly and delay the corrosion initiation by around 65 times in a 100 micron thick epoxy/graphene composite coating in comparison to the counterpart with the perpendicular alignment. The predicted corrosion parameters were in a good agreement with the experimental data, indicating the merit of the proposed model. Thus, this model can be further employed as the fundamental of future research on the optimum graphene orientation in anticorrosion composite coatings.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
