Amine-type corrosion inhibitors, which were made by reacting 1Mol. of higher fatty amines and 2-3Mols. of higher fatty acids, were tested for rust inhibitors as additives of hydrocarbon oils. The inhibitor, consisting of C
18-amine and C
18-saturated acid, was found best, because of its less wettability, its temperate solubility in oil and its covering ability of metal surfaces.
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