油溶性二正辛基二硫代氨基甲酸铈的合成及其摩擦化学特性研究

以二正辛胺、Ｃｅ２Ｏ３和ＣＳ２为原料合成出一种新型油溶性润滑油极压抗磨添加剂二正辛基二硫代氨基甲酸铈（Ⅲ），并在环－块式摩擦磨损试验机和四球试验机上，测定了它的减摩性能、承载能力和抗磨性能等，同时还就其添加量对这些性能的影响进行了考察；利用俄歇电子能谱仪和Ｘ射线光电子能谱仪，对边界润滑状态下形成的摩擦表面膜的元素组成和化学状态进行了分析．结果表明：在给定的试验条件下，这种添加剂可以使ＩＳＯＶＧ３２石蜡基矿物油的摩擦系数明显降低，能够使这种油的初始卡咬负荷和烧结负荷分别提高２．２倍和４．７倍，可见其减摩和抗磨性能良好；在这种添加剂作用下形成的表面层内含有有机物膜、氧化物膜、化学反应膜和Ｃｅ３＋渗透层等，这是摩擦化学作用的产物

Tribochemical Characteristics of Cerium Dioctyl Dithiocarbamate as a Antiwear Additive

Rare earth elements and their compounds have been found increasing applications in improving the structure and texture of metals and increasing the wear resistance and load bearing capacity by chemical heat treatment to metals or other physical techniques.In recent years,some inorganic rare earth salts were shown to be good solid lubricants.In order to overcome the difficulty of dissolving inorganic rare earths into lubricating oils,an oil soluble cerium dioctyl dithiocarbamate was prepared as an antiwear and extreme pressure additive,its chemical structure was characterized by infrared spectroscopy and inductively coupled argon plasma spectroscopy,and its tribological performances were evaluated with a ring on block test rig and a four ball machine.In addition,tribochemical characteristics of the additive under boundary lubrication conditions was studied by means of AES and XPS.The results showed that the additive can obviously increase antiwear and EP performances,and decrease the friction coefficient of the basestock over 30%.While the surface layer formed by the additive was actually composed of organic film,oxidation film,chemical reaction film and permeating film.The friction induced permeation of cerium played an important role in modifing the surface structures of rubbing pairs and increasing the wear resistance.