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Abstract
Carboxy ester oxidation on a low-carbon steel (iron) surface was studied at temperatures of 448 to 523 K to determine the extent of surface reaction between iron and oxidation products. The reaction was followed by semiquantitative analysis of dissolved iron using atomic absorption spectroscopy and by measuring the amount and molecular weight of the polymeric oxidation products using gel permeation chromatography. In contrast to reaction at an aluminum surface, reaction at the iron surface appeared to affect the molecular weight distribution of oxidation polymer and produced soluble iron products that homogeneously catalyzed ester degradation. The formation of soluble iron products was found to be extremely temperature-dependent, related to the degree of oxidation, and almost totally suppressed by a known metal coater—tricresyl phosphate (TCP). Evidence of a similar chemical reaction between carboxy ester oxidation products and an iron surface in the contact zone of an ester-lubricated, four-ball wear test is discussed.
Presented at the 36th Annual Meeting in Pittsburgh, Pennsylvania, May 11–14, 1981
Notes
Presented at the 36th Annual Meeting in Pittsburgh, Pennsylvania, May 11–14, 1981