Friction reduction by metal sulfides in boundary lubrication studied by XPS and XANES analyses
Friction reduction by metal sulfides in boundary lubrication studied by XPS and XANES analyses
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DOI：
10.1016/s0043-1648(03)00237-0
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发表时间：
2003-05
期刊：
影响因子：
5
通讯作者：
M. I. Barros;J. Bouchet;I. Raoult;T. Mogne;J. M. Martín;M. Kasrai;Y. Yamada
中科院分区：
文献类型：
--
作者：
M. I. Barros;J. Bouchet;I. Raoult;T. Mogne;J. M. Martín;M. Kasrai;Y. Yamada
本文研究了二硫代磷酸锌（ZnDTP）与二硫代氨基甲酸钼（MoDTC）摩擦改进剂的复配抗磨作用。Cameron-Plint摩擦机用于在温和的摩擦学条件下产生大的摩擦膜面积。两种分析技术，X射线光电子能谱（XPS）和X射线吸收近边结构（XANES）光谱，已被用来表征摩擦膜中的化学物种。在P K和L边、Mo L和M边以及S K边进行XANES光谱以研究摩擦膜中的磷酸盐和硫化物物种。特别注意了Fe 2 p、Zn 2 p、S 2 p、Mo 3d和O 1 s等六个峰与俄歇ZnLMM线的峰拟合。组合分析表明，含MoDTC+ZnDTP的油除了ZnS和MoS 2之外，主要产生较短链的金属多磷酸盐材料。未检出硫酸锌。XPS证实了ZnDTP的存在促进了MoS 2的形成。对于所有添加剂组合，在摩擦膜中未检测到铁。分析结果进行了讨论，并从ZnDTP，MoDTC和ZnDTP+MoDTC摩擦膜形成的化学硬度模型的理论预测进行比较。
In this work, the antiwear action of zinc dithiophosphate (ZnDTP) in combination with friction modifier agent molybdenum dithiocarbamate (MoDTC) has been investigated. A Cameron–Plint friction machine was used to generate large tribofilm areas in mild tribological conditions. Two analytical techniques, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectroscopy, have been employed to characterize the chemical species in tribofilms. XANES spectroscopy at the P K and L-edge, Mo L and M-edge and S K-edge was carried out in order to investigate phosphates and sulfides species in the tribofilms This was followed by XPS analysis in the same location in the tribofilms. Special attention has been paid to the peak fitting of Fe 2p, Zn 2p, S 2p, Mo 3d and O 1s photopeaks and Auger ZnLMM lines. The combined analyses have shown that the MoDTC+ZnDTP containing oil produces mainly shorter chain metal polyphosphate material in addition to ZnS and MoS2. No zinc sulfate has been detected. XPS confirms that the formation of MoS2is enhanced by the presence of ZnDTP. For all additives combinations; no iron has been detected in the tribofilms. Analytical results are discussed and compared with theoretical predictions from the Chemical Hardness model for ZnDTP, MoDTC and ZnDTP+MoDTC tribofilms formation.