Chemical and mechanical analysis of tribofilms from fully formulated oils part 1 - films on 52100 steel

TitleChemical and mechanical analysis of tribofilms from fully formulated oils part 1 - films on 52100 steel
Publication TypeJournal Article
Year of Publication2007
AuthorsPereira, G, Lachenwitzer, A, Kasrai, M, Bancroft, GM, Norton, PR, Abrecht, M, Gilbert, PUPA, Regier, T, Blyth, RIR, Thompson, J
JournalTribol.-Mater., Surf. & Interfaces
Volume1
Pagination48-61
ISBN Number1751-5831
Accession Number2008:459913
Keywordsantiwear film lubricant steel chem mech property, chem. and mech. anal. of tribofilms from fully formulated oils on 52100 steel), Chemistry, Films (lubricating, Lubricating oil additives (antiwear, Lubricating oils (fully formulated, Mechanical properties, Tribology (tribochemistry, XANES spectra (chem. and mech. anal. of tribofilms from fully formulated oils on 52100 steel)
Abstract

The authors report, for the first time, a comprehensive chem. and mech. characterization of antiwear films prepd. from a fully formulated oil that is com. available. Wear increases substantially when using the fully formulated oil compared to using ZDDP alone. X-ray absorption near edge structure (XANES) spectroscopy at the P K- and L-edges, S K-edge, Mo L-edge, B K-edge, Ca L-edge, O K-edge and Fe and Zn L-edges permits chem. characterization of the major elements in the thin films. Ca phosphates, ZnS and MoS2 are the main P and S species formed, contrary to previous studies involving only ZDDPs, whereby Zn phosphates are the dominant species. These findings can be accounted for by using the hard and soft acid and bases (HSAB) principle. Small amts. of CaCO3 are present, but no B was detected, implying it does not become incorporated into the film. At. force microscopy (AFM) reveals continuous pads with a relatively uniform indentation moduli (125 ± 10 GPa), sepd. by trenches that are essentially comprised of uncovered steel substrate. [on SciFinder(R)]