Journal ArticleDOI
Inhibition of iron-catalyzed neopentyl polyol ester thermal degradation through passivation of the active metal surface by tricresyl phosphate
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TLDR
In this article, the role of tricresyl phosphate (TCP) in inhibiting the iron-catalyzed thermal degradation of a neopentyl polyol ester gas turbine lubricant base stock, various TCP/ester combinations were encapsulated in mild steel tubing and heated at 500 F up to 96 hours.Abstract:
To investigate the role of tricresyl phosphate (TCP) in inhibiting the iron-catalyzed thermal degradation of a neopentyl polyol ester gas turbine lubricant base stock, various TCP/ester combinations were encapsulated in mild steel tubing and heated at 500 F up to 96 hours. The relative degradation rates of the individual mixtures were measured by monitoring the effusion site of hydrogen (a degradation byproduct) through the capsule all. The capsule interiors were then examined by electron microscopy and diffraction to determine whether correlation assisted between the features of the surface films formed and the reserved degradation rates. Distinctive films were produced in each test mixture. When ester degradation was inhibited by the addition of 2–10% TCP, characteristic iron oxide layer was always found at the ester/steel interface. It was postulated that TCP induces the formation of this film, that the film is the agency of inhibition, and that it is similar in action and genesis to the iron oxide pas...read more
Citations
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Journal ArticleDOI
Phosphate Esters, Thiophosphate Esters and Metal Thiophosphates as Lubricant Additives
David W. Johnson,John E. Hils +1 more
TL;DR: In this paper, the use of phosphate esters and thiophosphate esters as anti-wear or extreme pressure additives is reviewed with an emphasis on their mechanism of action.
Journal ArticleDOI
Effects of oxygen on the load-carrying action of some additives
TL;DR: In this paper, the mechanisms of load-carrying action of sulfur and phosphorus additives were investigated in air and argon, using the hot wire method and a four-ball machine.
Journal ArticleDOI
Auger Compositional Analysis of Ball Bearing Steels Reacted with Tricresyl Phosphate
E. G. Shafrin,J. S. Murday +1 more
TL;DR: In this paper, the authors used an Auger electron spectroscopy (AES) and depth-profiling technique to monitor changes in the chemistry of 52100 bearing steel surfaces as a function of cleaning history and conditions of TCP exposure.
Journal ArticleDOI
Interactions in Neopentyl Polyol Ester—Tricresyl Phosphate—Iron Systems at 500 F
TL;DR: In this article, the authors proposed a reaction mechanism for tricresyl phosphate (TCP) stabilizing the metal-ester system by generating a passive oxide film on the active metal surface.
Journal ArticleDOI
Thermal Characteristics of Some Organic Esters
TL;DR: In this paper, a more comprehensive quantitative evaluation of the thermal reaction of different types of organic acid esters indicates a somewhat different relative behavior in systems containing metals, indicating a definite effect of catalyst metals in the system is indicated.
References
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Journal ArticleDOI
Mechanism of Oxidation of Magnetite to γ -Fe 2 O 3
TL;DR: In this paper, it was shown that the rate of oxidation of magnetite crystals smaller than about 0.2µ to γ-Fe2O3 is controlled by the diffusion of iron cations.
Journal ArticleDOI
The Lubrication Mechanism of Tricresyl Phosphate on Steel
TL;DR: A literature survey showed that the lubricating mechanism of tricresyl phosphate (TCP) was not clear as discussed by the authors, and the theory of polishing by formation of an iron-iron phosphide eutectic was not supported.
Journal ArticleDOI
The Mechanism of the Inhibition of the Corrosion of Iron by Solutions of Sodium Orthophosphate
M. J. Pryor,M. Cohen +1 more
Journal ArticleDOI
The Anodic Passivation of Iron in Solutions Of Inhibitive Anions
J. G. N. Thomas,T. J. Nurse +1 more
TL;DR: In this paper, the anodic passivation of iron in air-saturated and de-aerated solutions of a number of inhibitive anions has been studied by the determination of potentiostatic polarisation curves.