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

K. K. Rhodes, Peter C Stair

Research output: Contribution to journalArticle

13 Citations (Scopus)

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. ZDP prevents surface oxide reduction, maintaining an easily sheared surface layer, preventing metal metal contact and wear.

Original languageEnglish
Pages (from-to)971-974
Number of pages4
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume6
Issue number3 , May-Jun. 1988
DOIs
Publication statusPublished - 1988

Fingerprint

Steel
Surface chemistry
Metal foil
Zinc
foils
Iron
zinc
steels
chemistry
iron
alkenes
Alkenes
Oxides
Olefins
photoelectron spectroscopy
X ray photoelectron spectroscopy
Metals
oxides
antioxidants
Mineral Oil

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces

Cite this

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AB - 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. ZDP prevents surface oxide reduction, maintaining an easily sheared surface layer, preventing metal metal contact and wear.

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