Regularities of the residual protective effect of the o-hydroxyazomethine reaction series toward aluminum corrosion in 1 M H2SO4

• V. P. Grigor´ev¹, S. P. Shpan´ko¹, E. V. Plekhanova¹, A. S. Burlov² and Yu. M. Plastun²

¹ Southern Federal University, ul. Zorge 7, Rostov-on-Don, 344090 Russian Federation
² Research Institute of Physical and Organic Chemistry at Southern Federal University, pr. Stachki 94/3, 344104 Rostov-on-Don, Russian Federation

Abstract:

The regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives on the acid corrosion of Al have been studied. The duration of the residual protective effect (τ) is a function of the polarity of substituents in o-hydroxyazomethine molecules, inverse temperature of the solution, and the additive concentration in the pre-adsorption solution. The identified regularities of the effect of these factors on τ is interpreted in terms of the Linear Free Energy Relationship approach. The changes in the near-electrode concentration of a desorbed inhibitor as a function of time and solution temperature are discussed. It is noted that the effects of various factors on the regularities of changes in the residual protective effect of o-hydroxyazomethine derivatives toward Al and Fe corrosion are similar.

Keywords: corrosion, inhibitor, residual protective effect, LFE concept, near-electrode concentration, effective activation energy

Int. J. Corros. Scale Inhib., 2012, 1, no. 2, 86-98 PDF (1 088 K)
doi: 10.17675/2305-6894-2012-1-2-086-098

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