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Surface Chemistry of Tribochemical Reactions Explored in UltraHigh Vacuum Conditions
Thin Solid Films (2006)
  • JAVIER LARA-ROMERO
  • RAFAEL MAYA-YESCAS
  • JOSE LUIS RICO-CERDA
  • JOSE LUIS RIVERA-ROJAS
  • FERNANDO CHIÑAS-CASTILLO
  • MICHAEL KALTCHEV, Milwaukee School of Engineering
  • WILFRED TYSOE
Abstract

The thermal decomposition of model extreme-pressure lubricant additives on clean iron was studied in ultrahigh vacuum conditions using molecular beam strategies. Methylene chloride and chloroform react to deposit a solid film consisting of FeCl2 and carbon, and evolve only hydrogen into the gas phase. No gas-phase products and less carbon on the surface are detected in the case of carbon tetrachloride. Dimethyl and diethyl disulfide react on clean iron to deposit a saturated sulfur plus carbon layer at low temperatures (600 K) and an iron sulfide film onto a Fe + C underlayer at higher temperatures (950 K). Methane is the only gas-phase product when dimethyl disulfide reacts with iron. Ethylene and hydrogen are detected when diethyl disulfide is used.

Keywords
  • Tribological coatings; Molecular beam; Chlorinated hydrocarbons; Sulfurized hydrocarbons
Publication Date
2006
Citation Information
JAVIER LARA-ROMERO, RAFAEL MAYA-YESCAS, JOSE LUIS RICO-CERDA, JOSE LUIS RIVERA-ROJAS, et al.. "Surface Chemistry of Tribochemical Reactions Explored in UltraHigh Vacuum Conditions" Thin Solid Films Vol. 496 Iss. 2 (2006)
Available at: http://works.bepress.com/rafael_maya_yescas/29/