NDLI: Reactions of Aromatic Phosphate Esters with Metals and Their Oxides

Content Provider	Springer Nature Link
Author	Saba, C. S. Forster, N. H.
Copyright Year	2002
Abstract	Previous results obtained in this laboratory have shown that tricresyl phosphate vapors preferentially react with iron and its oxides in the order of the oxidation state (reaction rate of Fe$^{3+}$≫Fe$^{2+}$>Fe$^{+}$>Fe). The reaction kinetics is attributed to a Lewis acid, Fe$_{ n }$O$_{ m }$, reacting with the basic phosphate ester, (ArO)$_{3}$PO. The current research further investigates the role of the oxide in the reaction of the aryl phosphate lubricants, tricresyl phosphate and tertiary-butyl phenyl phosphate, with 1010 steel coupons. To measure the relative effect of iron oxides, some coupons were exposed to 400 °C air for 1 h and then sealed under vacuum in glass tubes with 25 mg of lubricant. Other samples were sealed under vacuum without the oxidation step. All of the sealed test tubes with lubricant and foil were heated to a temperature of 475 °C and held for different lengths of time. Afterwards, the coupons were analyzed with Fourier infrared microscopy, Auger electron spectroscopy, Raman spectroscopy, and scanning electron microscopy. In the case of the pre-oxidized sample, a nodular film was formed that contained organic species and iron polyphosphate. For samples that were not pre-oxidized, simple ionic iron phosphate was formed. In another work it was found that nodular structure formation is important to obtain good lubrication. This type of film forms on iron surfaces and not on surfaces passivated by inert oxide films, i.e., aluminum, nickel, and high chrome content alloys. The reaction of tricresyl phosphate with other metals and their oxides were also examined and found to correlate well with iron.
Starting Page	135
Ending Page	146
Page Count	12
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	12
Issue Number	2
e-ISSN	15732711
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-05-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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