The role of the cation in antiwear films formed from ZDDP on 52100 steel
Phosphorus L-edge and oxygen K-edge X-ray PhotoEmission Electron Microscopy (XPEEM) have been used to characterize the chemical nature of the cation present in tribochemical films via comparison with model Fe2+ and Zn2+ compounds. The results are contrasted to the P L-edge, P K-edge and S K-edge XAN...
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| Veröffentlicht in: | Tribology letters 2006-08, Vol.23 (2), p.109-119 |
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| creator | Pereira, Gavin Lachenwitzer, Andreas Munoz-Paniagua, David Kasrai, Masoud Norton, Peter R. Abrecht, Mike Gilbert, P.U.P.A. |
| description | Phosphorus L-edge and oxygen K-edge X-ray PhotoEmission Electron Microscopy (XPEEM) have been used to characterize the chemical nature of the cation present in tribochemical films via comparison with model Fe2+ and Zn2+ compounds. The results are contrasted to the P L-edge, P K-edge and S K-edge XANES data. The findings suggest that antiwear pads containing long chain zinc polyphosphate glass are formed at the points of asperity contact, and a thin, short chain zinc polyphosphate film is formed where no asperity contact is made. SEM/EDX measurements helped to elucidate the distribution of the elements, and strong spatial correlations were observed between P, O, Zn and S in the pads, indicating that they are composed mostly of zinc polyphosphates, especially near the surface. The zinc polyphosphate antiwear pads are characterized by a much lower modulus than that observed on the thin film regions, the latter being characteristic of the substrate steel. |
| doi_str_mv | 10.1007/s11249-006-9059-y |
| format | Article |
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| ispartof | Tribology letters, 2006-08, Vol.23 (2), p.109-119 |
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| language | eng |
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| source | Springer Nature - Complete Springer Journals |
| subjects | Asperity Cations Organic chemistry Photoelectric emission Polyphosphates Substrates Thin films Tribology Zinc |
| title | The role of the cation in antiwear films formed from ZDDP on 52100 steel |
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