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Surface chemistry of tribochemical reactions explored in ultrahigh vacuum conditions |
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| Authors: | Javier Lara-Romero Rafael Maya-Yescas José Luis Rico-Cerda José Luis Rivera-Rojas Fernando Chiñas Castillo Matey Kaltchev |
| Affiliation: | a Faculty of Chemical Engineering, Universidad Michoacana de San Nicolás de Hidalgo, Ciudad Universitaria, Edificio M, C.P. 58060, Morelia, Michoacán, México b Mecanical Engineering Department, Instituto Tecnológico de Oaxaca, C.P. 68030, Oaxaca, Oaxaca, México c Department of Chemistry and Physics, Milwaukee School of Engineering, Milwaukee, WI, 53211, USA d Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA |
| 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 |
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