Surface chemistry of tribochemical reactions explored in ultrahigh vacuum conditions

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 FeCl 2 and carbon, and evolve only hydrogen into the gas pha...

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Bibliographic Details
Published in:Thin solid films 2006-02, Vol.496 (2), p.463-468
Main Authors: Lara-Romero, Javier, Maya-Yescas, Rafael, Rico-Cerda, José Luis, Rivera-Rojas, José Luis, Castillo, Fernando Chiñas, Kaltchev, Matey, Tysoe, Wilfred T.
Format: Article
Language:English
Subjects:
Chlorinated hydrocarbons
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Molecular beam
Physics
Sulfurized hydrocarbons
Tribological coatings
Tribology and hardness
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Summary: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 FeCl 2 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.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2005.09.108