铁润滑中石墨烯的表面钝化：与青铜的比较
Surface passivation by graphene in the lubrication of iron: A comparison with bronze
摘要：
最近有报道称，石墨烯能够显著降低钢对钢滑动接触的摩擦系数。这种行为的微观起源已被归因于承载能力的机械作用。然而，最近的一项工作强调了石墨烯化学作用的重要性。根据这项工作，由于钝化效应，石墨烯通过降低表面能来降低铁界面的粘附力。本工作的目的是澄清仍然有争议的石墨烯片的润滑行为。我们使用液体分散的石墨烯溶液作为润滑剂进行销盘实验。两种不同的材料，纯铁和青铜对100Cr6钢进行了测试。拉曼光谱用于分析摩擦测试后的表面。这些测试的结果证明石墨烯薄片对摩擦系数具有有益的影响。同时，它们显示出石墨烯钝化在滑动期间由于磨损而暴露的天然铁表面的趋势。
英文摘要：
It has been recently reported that graphene is able to significantly reduce the friction coefficient of steel-on-steel sliding contacts. The microscopic origin of this behavior has been attributed to the mechanical action of load carrying capacity. However, a recent work highlighted the importance of the chemical action of graphene. According to this work graphene reduces the adhesion of iron interfaces by reducing the surface energy thanks to a passivation effect. The aim of the present work is to clarify the still debated lubricating behavior of graphene flakes. We perform pin-on-disc experiments using liquid dispersed graphene solution as a lubricant. Two different materials, pure iron and bronze are tested against 100Cr6 steel. Raman spectroscopy is used to analyze the surfaces after the friction tests. The results of these tests prove that graphene flakes have a beneficial effect on the friction coefficient. At the same time they show a tendency of graphene to passivate the native iron surfaces that are exposed during sliding as a consequence of wear.
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