Abstract Water-based lubricants are attractive owing to their low cost and eco-friendliness. An appropriate additive package must be considered to use water as a lubricant. Recently, protic ionic liquids (PILs) were emphasized for improving the lubricity of water. Most PILs are nontoxic and biodegradable. In this study, tert-octylamine oleate and diethanolamine oleate PILs were investigated by using them as additives (1% wt.) in water. Their lubrication properties were tested on a ball-on-plate reciprocating tribometer using steel-steel and alumina-steel friction pairs. The investigated PILs improved water's friction and wear reduction ability up to 80%. Both friction pairs performed similarly. However, the alumina-steel friction pair exhibited a more stable friction. The adsorption layer was assumed the most likely friction and wear reduction mechanism.

中文翻译：

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研究两种质子离子液体作为钢-钢和氧化铝-钢接触水中添加剂的摩擦学性能

摘要 水基润滑剂由于其低成本和生态友好而具有吸引力。必须考虑使用合适的添加剂包以使用水作为润滑剂。最近，人们强调使用质子离子液体 (PIL) 来改善水的润滑性。大多数 PIL 是无毒且可生物降解的。在本研究中，通过将油酸叔辛胺和油酸二乙醇胺 PIL 用作水中的添加剂 (1% wt.) 对其进行了研究。它们的润滑性能在使用钢-钢和氧化铝-钢摩擦副的板球往复摩擦计上进行了测试。研究的 PIL 将水的摩擦和磨损减少能力提高了 80%。两个摩擦副表现相似。然而，铝钢摩擦副表现出更稳定的摩擦。