It has been established that the protective effectiveness of oil-soluble corrosion inhibitors of the MSDA-11 type is related not only to their ability to form adsorbed barrier films to make the metal surface hydrophobic, but also to their migration to the aqueous phase and their effects on the kinetics of the electrode reactions responsible for the corrosion process.
Effective oil-soluble inhibitors of this type improve the electrode potential of the metal and retard the anodic process of metal ionization in aqueous extracts from inhibited oils, in a manner analogous to that of anodic water-soluble corrosion inhibitors.
It has been shown that measurements of electrode potentials and recording of polarization curves of metals in aqueous extracts from oils containing corrosion inhibitors can be used as a means of rating the relative effectiveness of oils with certain inhibitors, provided these inhibitors are partially water-soluble.
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Kharitonov, I.S., Vainshtok, V.V., Gintsberg, S.A. et al. Mechanism of protective action of certain oil-soluble corrosion inhibitors. Chem Technol Fuels Oils 7, 222–225 (1971). https://doi.org/10.1007/BF00719542
- Metal Ionization
- Aqueous Phase
- Metal Surface
- Aqueous Extract