Mujib Shakir Bin, Mukherjee Santanu, Ren Zhongkan, Singh Gurpreet
Department of Mechanical and Nuclear Engineering, Kansas State University, Manhattan, KS 66506, USA.
R Soc Open Sci. 2020 Apr 29;7(4):200214. doi: 10.1098/rsos.200214. eCollection 2020 Apr.
Two-dimensional (2D) materials have elicited considerable interest in the past decade due to a diverse array of novel properties ranging from high surface to mass ratios, a wide range of band gaps (insulating boron nitride (BN) to semiconducting transition metal dichalcogenides), high mechanical strength and chemical stability. Given the superior chemo-thermo-mechanical properties, 2D materials may provide transformative solution to a familiar yet persistent problem of significant socio-economic burden: the corrosion of stainless steel (SS). With this broader perspective, we investigate corrosion resistance properties of SS-coated with 2D nanomaterials; molybdenum disulfide (MoS), BN, bulk graphite in 3.5 wt% aqueous NaCl solution. The nanosheets were prepared by a novel liquid phase exfoliation technique and the coatings were made by a paint brush to achieve uniformity. Open circuit potential (OCP) and potentiodynamic plots indicate the best corrosion resistance is provided by the MoS coatings. Superior performance of the coating is attributed to low electronic conductivity, large flake size and uniform coverage of SS substrate, which probably impeded the corrosive ions from the solution from diffusing through the coating.
在过去十年中，二维（2D）材料因其一系列新颖的特性而引起了人们的广泛关注，这些特性包括高的比表面积、宽范围的带隙（从绝缘的氮化硼（BN）到半导体过渡金属二硫化物）、高机械强度和化学稳定性。鉴于其优异的化学-热-机械性能，二维材料可能为一个常见但持续存在且带来重大社会经济负担的问题提供变革性解决方案：不锈钢（SS）的腐蚀。从更广泛的角度来看，我们研究了涂覆有二维纳米材料（二硫化钼（MoS）、BN、块状石墨）的不锈钢在3.5 wt%的NaCl水溶液中的耐腐蚀性能。纳米片通过一种新型液相剥离技术制备，涂层通过漆刷制成以实现均匀性。开路电位（OCP）和动电位极化曲线表明，MoS涂层具有最佳的耐腐蚀性。涂层的优异性能归因于其低电子导电性、大的片状尺寸以及对不锈钢基体的均匀覆盖，这可能阻碍了溶液中的腐蚀性离子通过涂层扩散。
