二烷基二硫代磷酸镉的抗磨性能

合成了润滑油添加剂二烷基二硫代磷酸镉（CdDDP），利用四球试验机考察了其极压和抗磨性能，并与同类传统添加剂进行了比较；采用X射线光电子能谱仪、扫描电子显微镜和X-射线光电子能谱仪对边界润滑状态下形成的磨斑及磨斑表面典型元素的组成、化学状态和含量进行了分析；探讨了CdDDP的抗磨作用和摩擦化学反应机理。结果表明，CdDDP具有优良的抗磨性能和承载能力，其主要原因可能是在摩擦过程中与金属表面作用，生成了由Cd、FeS、硫酸盐和磷酸盐等组成的边界润滑膜，尤其单质镉软金属层，起到了缓冲载荷和抑制磨损的作用。

ANTIWEAR PROPERTIES OF CADMIUM DIALKYLDITHIOPHOSPHATE

Cadmium dipropyldithiophosphate(CdDDP),an antiwear additive used in lube oil,was synthesized.The properties of extreme pressure and antiwear were evaluated by four balls tester at different concentration and load,and compared to that of traditional additive.The rubbing surface was investigated by using X-ray photoelectron spectrometer(XPS),scanning electron microscopy(SEM) and erergy dispersive X-ray(EDX).The antiwear mechanism of CdDDP was also preliminarily investigated.The results showed that CdDDP possessed better antiwear and load carrying capacity than base oil and Zinc dialkyldithiophosphate(ZnDDP),the main reason of which might be that the additive reacted with the metal surface in friction process and formed a boundary lubricating and protective films consisting of atomic cadmium,sulphides,sulphates and phosphates,particularly softy cadmium deposits on the metal surface,to protect the substrate against wear.