Adsorption Characteristics and Reaction Film Analysis in a Mixed System of Sulfur- and Phosphorus-Type Extreme-Pressure Agents / 硫黄系・リン系極圧剤混合系での吸脱着挙動と反応膜組成の解析
- Resource Type
- Journal Article
- Authors
- Enzo UNO; Hideki SAKAI; Hironobu MATSUEDA; Hiroshi SAKATA; Kenichi SAKAI; Masaaki AKAMATSU; 坂田 浩; 宇野 円蔵; 松枝 宏尚; 赤松 允顕; 酒井 健一; 酒井 秀樹
- Source
- トライボロジスト / JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS. :22-00006
- Subject
- adsorption
friction
phosphorus-type extreme-pressure agent
quartz crystal microbalance with dissipation monitoring (QCM-D)
sulfur-type extreme-pressure agent
- Language
- Japanese
- ISSN
- 0915-1168
2189-9967
We characterized the adsorption and desorption behavior of mixed extreme-pressure (EP) agents at an iron oxide/dodecane interface. The EP agents employed in this study were mixtures of sulfur-type 10,10ʼ-trisulfanediyldistearic acid and phosphorus-type di(2-ethylhexyl)phosphate. The quartz crystal microbalance with dissipation monitoring technique revealed that the two EP agents could adsorb on the iron oxide competitively, and the phosphorus-type EP agent inhibited the adsorption of the sulfur-type EP agent. The kinetic friction coefficient was observed to be smaller for the mixed EP agent system than for the single sulfur-type EP agent or the single phosphorus-type EP agent system. The X-ray photoelectron spectroscopy further suggested that the phosphorus-type EP agent promoted the formation of an oxidized surface film of sulfur components on steel under sliding conditions. This also contributed to the decreased kinetic friction coefficient for the mixed EP agent system. The adsorption inhibition by the phosphorus-type EP agent suppresses consumption of the sulfur-type EP agent in a sliding environment. This leads to the sustainability of the friction reduction effect in a wide range of sliding environments in industry.