The effect of zdp’s on the surface chemistry of hydrocarbon films on oxidized iron substrates

K. L. Rhodes, P. C. Stair

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The thermal chemistry of lubricant molecules adsorbed on polycrystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined mere a synthetic, poly-a-olefin base oil and a base oil containing three different zinc dialkyldithiophosphates (ZDP’s); isooctyl ZDP, isopropyl ZDP, and an aryl ZDP. The major focus of the work was to determine the influence of the base oil and additives on the thermal reduction of the native iron oxide passivating film. The kinetics of iron oxide film reduction were analyzed using a sequential reaction scheme, i.e., (Equation found), with temperature-dependent rate constants determined by fitting to time-and temperature-dependent XPS data. The authors conclude that the presence of base oil accelerates oxide film reduction and that ZDP moderates this effect to some degree.

Original languageEnglish (US)
Pages (from-to)27-34
Number of pages8
JournalTribology Transactions
Volume36
Issue number1
DOIs
StatePublished - Jan 1993

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint

Dive into the research topics of 'The effect of zdp’s on the surface chemistry of hydrocarbon films on oxidized iron substrates'. Together they form a unique fingerprint.

Cite this