Electrocapillary Action of Corrosion Inhibitors

Details Electrocapillary Action of Corrosion Inhibitors Electrocapillary Action of Corrosion Inhibitors

Apr 1958

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1958natur.181.1060g&link_type=abstract

Nature, Volume 181, Issue 4615, pp. 1060-1061 (1958).

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Scientific paper

Indelli and Pancaldi1 and I2 have compared some characteristic phenomena occurring at the interface of a dropping mercury microelectrode and electrolyte solutions with phenomena encountered in corrosion inhibition2. It was found2 that the effectiveness of numerous corrosion inhibitors is reflected in their ability to suppress various polarographic maxima (abnormal current peaks in the current-voltage curves of the mercury microelectrode). In particular, it was shown that the order of relative inhibiting effectiveness of a number of amine inhibitors (for the iron - sulphuric acid system) is the same as that of their effectiveness in suppressing certain polarographic maxima. These amines (both aliphatic and aromatic) were most effective in suppressing maxima corresponding to the negative branch of the electrocapillary curve at which mercury is negatively charged with respect to the solution. This is consistent with Mann's3 conclusion that amines inhibit the corrosion of iron in sulphuric acid by becoming adsorbed on the cathodic areas of this metal. It was thus demonstrated that significant similarities exist between the processes involved in polarographic maxima and their suppression, on one hand, and in metallic corrosion and its inhibition, on the other4. Campbell5 has also employed polarographic techniques in detecting corrosion inhibitors.

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