Effect of ZDP's on the surface chemistry of hydrocarbon films on oxidized iron substrates

K. L. Rhodes, Peter C Stair

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The thermal chemistry of lubricant molecules adsorbed on poly-crystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined were a synthetic, poly-α-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., FeIIIFeIIFe0, 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
Pages (from-to)27-34
Number of pages8
JournalS T L E Tribology Transactions
Volume36
Issue number1
Publication statusPublished - Jan 1993

Fingerprint

Hydrocarbons
Surface chemistry
Zinc
Iron
hydrocarbons
zinc
chemistry
Oils
iron
oils
Oxide films
Substrates
oxide films
lubricants
Iron oxides
iron oxides
Lubricants
X ray photoelectron spectroscopy
photoelectron spectroscopy
Alkenes

ASJC Scopus subject areas

  • Engineering(all)
  • Mechanical Engineering

Cite this

Effect of ZDP's on the surface chemistry of hydrocarbon films on oxidized iron substrates. / Rhodes, K. L.; Stair, Peter C.

In: S T L E Tribology Transactions, Vol. 36, No. 1, 01.1993, p. 27-34.

Research output: Contribution to journalArticle

@article{f9cfba2adb4f4b9cb6f2f68cc09f084d,
title = "Effect of ZDP's on the surface chemistry of hydrocarbon films on oxidized iron substrates",
abstract = "The thermal chemistry of lubricant molecules adsorbed on poly-crystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined were a synthetic, poly-α-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., FeIIIFeIIFe0, 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.",
author = "Rhodes, {K. L.} and Stair, {Peter C}",
year = "1993",
month = "1",
language = "English",
volume = "36",
pages = "27--34",
journal = "Tribology Transactions",
issn = "0569-8197",
publisher = "Society of Tribologists and Lubrication Engineers",
number = "1",

}

TY - JOUR

T1 - Effect of ZDP's on the surface chemistry of hydrocarbon films on oxidized iron substrates

AU - Rhodes, K. L.

AU - Stair, Peter C

PY - 1993/1

Y1 - 1993/1

N2 - The thermal chemistry of lubricant molecules adsorbed on poly-crystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined were a synthetic, poly-α-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., FeIIIFeIIFe0, 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.

AB - The thermal chemistry of lubricant molecules adsorbed on poly-crystalline iron substrates has been studied using X-ray photoelectron spectroscopy (XPS). The lubricants examined were a synthetic, poly-α-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., FeIIIFeIIFe0, 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.

UR - http://www.scopus.com/inward/record.url?scp=0027338939&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027338939&partnerID=8YFLogxK

M3 - Article

VL - 36

SP - 27

EP - 34

JO - Tribology Transactions

JF - Tribology Transactions

SN - 0569-8197

IS - 1

ER -