Lithium and complex lithium greases were modified by few-layer graphene nanoflakes. Tribological tests demonstrate improvement of the lubricating characteristics, e.g. increase of the welding load and decrease of the wear scar diameter after the modification. XPS method showed occurrence tribochemical reaction between lithium 12-hydroxystearate molecules and graphene nanoflakes surface during exploitation of the grease. It was shown that graphene nanoflakes are corrosion-inactive in lubricating compositions and compatible with modern additive packages.

中文翻译：

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石墨烯纳米薄片作为锂基润滑脂的有效掺杂剂

锂和复合锂润滑脂由几层石墨烯纳米薄片改性。摩擦学测试证明了润滑特性的改善，例如焊接负荷的增加和改性后磨痕直径的减小。XPS方法表明，在油脂开采过程中，12-羟基硬脂酸锂分子与石墨烯纳米薄片表面发生摩擦化学反应。结果表明，石墨烯纳米薄片在润滑组合物中是无腐蚀的，并且与现代添加剂包兼容。