醇和羧酸添加剂对菜籽油抗磨与极压性能的影响

在四球摩擦磨损试验机上考察了醇－菜籽油及羧酸－菜籽油对钢－钢摩擦副抗磨与极压性能的影响，并分析了其润滑机制。结果表明，醇不能改善菜籽油的抗磨性能及承载能力，羧酸能明显改善菜籽油的抗磨性能，但却降低其承载能力，这与菜籽油本身的特性及三者的极性强弱有关。钢球磨损表面ＸＰＳ分析表明：２种润滑剂体系在摩擦过程中均形成了复杂的表面保护膜。２种润滑剂体系在钢球表面形成的保护膜的特性不同，这决定了它们个有不同的

Effect of Alcohols and Fatty Acids as Additives on the Antiwear and Extreme Pressure Properties of Rapeseed Oil

The effect of n alcohols and fatty acids as additives on the antiwear and extreme pressure properties of rapeseed oil in sliding of steel against steel as investigated using a four ball machine. The worn steel surfaces were analyzed by means of scanning electron microscopy (SEM) and X ray photoelectron spectroscopy (XPS). It has been found that n alcohol as additive in rapeseed oil has little effect on wear resistance and load carrying capacity, while fatty acid increases the antiwear ability but decreases the load carrying capacity considerably. This is closely related with the characteristics of rapeseed oil and the polarity of the base stock and additives. The XPS analysis of the worn steel surfaces indicates that tribochemical reactions were involved in the friction process and complex lubricating films were formed on the steel surface. The different characteristics of the lubricating films govern the different tribological behaviors of the additive containing rapeseed oil.