Superlubricity has numerous benefits in industrial applications, but its practical applications are restrained from its heavy dependence on special atmosphere environment and the use of low-dimensional materials. This paper reports a novel and facile method to macroscale liquid superlubricity for steel tribopairs, which realizes superlow friction almost right at the start of the test. Two diols of ethylene glycol (EG) and 1,3-propanediol (13-PD) are used as the base lubricants, and fructose is dissolved into two diols at various fructose/diol weight ratios. Then the tribological properties of the prepared lubricant solutions have been investigated. Friction test results suggest that the lubricant solutions of fructose and EG with the fructose/EG weight ratio of 0.5 is capable of realizing stable and robust superlubricity combined with little wear under a certain range of testing conditions for steel tribopairs. Such desirable superlubrication state can be attributed to three main factors: (1) formation of a desirable hydrodynamic lubricant film between the tribopairs to support the load and separate the rubbing surfaces; (2) effective passivation effect to the asperity contact sites at the interface by forming robust slippery layers of fructose and diol molecules; (3) tribological polishing effect to make the contacting surfaces smooth. Lubricant solutions of fructose and 13-PD with the fructose/13-PD weight ratio of 0.3 is also found to behave near superlow friction and negligible wear, allowing it to replace fructose/EG = 0.5 in certain applications where both superlow friction and human safety are greatly concerned.

超润滑性在工业应用中具有诸多优势，但其对特殊大气环境的严重依赖和低维材料的使用限制了其实际应用。本文报告了一种新的、简便的方法，用于钢摩擦副的宏观液体超润滑，几乎在测试开始时就实现了超低摩擦。乙二醇 (EG) 和 1,3-丙二醇 (13-PD) 两种二醇用作基础润滑剂，果糖以不同的果糖/二醇重量比溶解成两种二醇。然后研究了制备的润滑剂溶液的摩擦学性能。摩擦试验结果表明，果糖/EG重量比为0的果糖和EG润滑剂溶液。5 能够在一定范围的测试条件下为钢摩擦副实现稳定和强大的超润滑性，同时几乎没有磨损。这种理想的超润滑状态可归因于三个主要因素：（1）在摩擦对之间形成理想的流体动力润滑膜以支撑负载并分离摩擦表面；(2) 通过形成坚固的果糖和二醇分子的光滑层，对界面处的粗糙接触点产生有效的钝化作用；(3)摩擦抛光作用，使接触面光滑。还发现果糖/13-PD 重量比为 0.3 的果糖和 13-PD 润滑剂溶液的表现接近超低摩擦和可忽略不计的磨损，使其能够替代果糖/EG = 0。