The \arious physical and chemical phenomena are discussed w-hich are involved in the adsorption of polar solutes from nonpolar or weakly polar solvents. The mechanism of the rust inhibition caused by many polar compounds is analj zed in terms of such properties of the adsorbed molecules as the hydrophobic property, the energy of adsorption, the effect of temperature on the adsorptivity, steric hindrances to close packing, the penetrability of the monolayer by molecules of water, and the solubility of the monolayer in water. The rust inhibition obtainable in a reference petroleum oil b y the addition of a variety of polar compounds, many of which are exceptionally pure, has been obsened using the turbine oil rusting test at different concentrations and temperatures. The results have been classified and interpreted in ternis of the theory outlined and organic chemical considerations. The conclusions are generalized further by a comparison of the data obtained for some selected polar compounds dissolved in petroleum oils, several pure hydrocarbons, several chlorinated hy drocarbons, a group of aliphatic diesters, bome polyalkylene glycol derivatives, and 1 arious t j pes of silicone fluids.
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