The surface chemistry of zinc dialkyldithiophosphate, an antiwear additive, on oxidized iron and steel foils

Kent L. Rhodes, Peter Stair

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The chemisorption and thermal chemistry of zinc dialkyldithiophosphate (ZDP) were studied on iron oxide and AISI 52100 steel substrates using x-ray photoelectron spectroscopy (XPS). Solutions of alkyl and aryl ZDP's in a synthetic hydrocarbon oil [poly-alpha-olefin (PAO) ] were used. Surface oxide layers on both iron and steel foils were reduced to metallic iron when heated with a film of PAO on the surface. The addition of ZDP to the films prevented reduction. XPS revealed that a surface sulfate was reduced to sulfide upon heating. Several possible mechanisms for the surface antioxidant activity of ZDP are discussed. The results of this investigation suggest a new model for the anti wear activity of ZDP. ZDP prevents surface oxide reduction, maintaining an easily sheared surface layer, and thus preventing metal-metal contact and wear.

Original languageEnglish (US)
Pages (from-to)971-974
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume6
Issue number3
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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