Structure Effects of Many-Membered Polymethyleneimine on Corrosion Inhibition

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Abstract
Corrosion rates of pure iron in solution with and without corrosion inhibitors were determined by polarization measurements, volumetric measurements of evolved hydrogen, and weight loss measurements. C5 and C8 to C14 polymethyleneimines and C6 to C14 symmetric secondary amines were tested as the inhibitor. Basicity values and relative molecular areas of these inhibitors were also determined. A comparison of the inhibition effectiveness within these two series indicates that the inhibition effect of the mediumsized cyclic imines (C9 to C12) is closely related to the angle of the C‐N‐C bond in their molecules and thus to strain in the ring.

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