Department of Materials Science and Engineering, National Tsing-Hua University , Hsinchu 30010, Taiwan.
Department of Physics, National Taiwan University , Taipei 10617, Taiwan.
ACS Appl Mater Interfaces. 2017 Jul 12;9(27):22911-22917. doi: 10.1021/acsami.7b04381. Epub 2017 Jun 26.
Corrosion protection of complex surface is an active area of research due to its importance to commercial applications such as electrochemical fabrication. However, conventional coatings exhibit limited conductivity, thermal stability, and durability and are thus not suitable. Recent work has shown the potential of graphene, a two-dimensional carbon allotrope, for corrosion protection. The studies, however, limited themselves to simple planar geometries that provide limited insight in the applicability to relevant morphologies such as mesh electrodes and roughened surfaces. We here study the corrosion protection ability of tubular graphene (TG) on Ni-wires as a model system for such complex geometries. TG-covered Ni wires of approximately 50 μm diameters were produced by the annealing of cellulose acetate (CA) on Ni. The high quality of the TG coating was confirmed by Raman spectroscopy, scanning electron microscopy, and electrical measurements. We show that the graphene layer number could be controlled by adjusting the CA membrane quantity. We found a direct relation between the degree of corrosion inhibition with the variation of graphene layer number. The increase of graphene layers on a Ni surface could enhance its corrosion inhibition in acidic, basic, and marine environments, which shows the potential of our approach for future applications.
复杂表面的腐蚀防护是一个活跃的研究领域，因为它对电化学制造等商业应用很重要。然而，传统的涂层表现出有限的导电性、热稳定性和耐久性，因此并不适用。最近的研究表明，二维碳同素异形体石墨烯具有腐蚀防护的潜力。然而，这些研究仅限于简单的平面几何形状，这些形状对相关形态（如网状电极和粗糙表面）的适用性提供的见解有限。我们在这里研究了管状石墨烯 (TG) 在作为此类复杂几何形状模型系统的 Ni 线（镍丝）上的腐蚀防护能力。通过在 Ni 上退火醋酸纤维素 (CA) 来制备 TG 覆盖的 Ni 线，直径约为 50 μm。通过拉曼光谱、扫描电子显微镜和电学测量证实了 TG 涂层的高质量。我们表明，可以通过调整 CA 膜量来控制 TG 层的数量。我们发现，随着石墨烯层数的变化，腐蚀抑制程度呈直接关系。在酸性、碱性和海洋环境中，Ni 表面上石墨烯层的增加可以增强其腐蚀抑制作用，这表明我们的方法在未来应用中的潜力。
