Abstract
QUALITATIVE evidence has been given1 that oils compounded with efficient dicarboxylic (alkylated succinic acids) rust inhibitors will not prevent rusting at certain low concentrations of the additive. When oil at these low concentrations of inhibitor was saturated with water, however, rust protection was obtained. Von Fuchs attributed this behaviour to the chemical reaction of iron with water to form ferrous hydroxide, which in turn can react with the acidic inhibitor to form a tenacious film of soap on the metal surface. Another investigation2, using stearic acid labelled with carbon-14, demonstrated that the acid is adsorbed more readily to ferrous surfaces from hydrocarbon solution containing entrained moisture than from a relatively dry solution. This phenomenon of enhanced adsorption to the metal surface was explained by Ries et al. as probably being due to an increase in the oxide coating produced by the presence of moisture.
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References
von Fuchs, G. H., “Evaluation and Performance of Turbine Oils” A.S.T.M. Spec. Tech. Pub. No. 211, 93 (1956).
Ries, jun., H. E., Cook, H. D., and Loane, C. M., “Evaluation and Performance of Turbine Oils”, A.S.T.M. Spec. Tech. Pub. No. 211, 55 (1956).
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SCHRADER, M., KALINSKY, J. Effect of Moisture on Carboxylic Acid Adsorption to Steel. Nature 186, 710 (1960). https://doi.org/10.1038/186710a0
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DOI: https://doi.org/10.1038/186710a0
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