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

́ev, V.P. Grigor; Ko, Sang-Won; Plekhanova, E. V.; Бурлов, А. С.; Plastun, Yu.M.

doi:10.17675/2305-6894-2012-1-2-086-098

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“…The specific features of metal corrosion in the presence of oxyazomethine have been studied thoroughly [1][2][3][4][5]. The feasibility of corrosion inhibition by chelates of these metals has not been studied.…”

Section: R-nhmentioning

confidence: 99%

Inhibitive properties of some chelates and their ligands in acid corrosion of zinc

́ev¹,

Белоусова²,

Plekhanova³

et al. 2014

Int. J. Corros. Scale Inhib.

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A comparative study of the protective properties of zinc chelate complexes with various ohydroxyazomethine derivatives having substituents of various nature at the ligand benzene ring has been carried out for zinc acid corrosion in H 2 SO 4 solutions. Key words: corrosion, inhibitor, chelates, ligands, zinc.Received: June 26, 2014June 26, . doi: 10.17675/2305June 26, -6894-2014 The corrosion resistance of zinc in acidic media is quite low. The most popular methods of metal protection from corrosion in aqueous media include inhibition of the corrosive medium and electrochemical methods based on the negative difference effect upon imposition of cathodic polarization on the corroding metal. Implementation of these methods with high-efficiency prevention of acid corrosion of zinc encounters serious difficulties. To protect zinc, it is most reasonable to use cationic inhibitors that bear a positive charge and hence readily undergo electrostatic adsorption on a zinc electrode surface in an acid solution. Normally, a molecule of a cationic inhibitor contains N 3-nitrogen that is readily protonated to give an 3 R-NH  group. The latter is readily discharged to produce hydrogen and thus catalyzes the slow discharge reaction. Thus, a cationic inhibitor can slow down corrosion considerably if its screening effect dominates over its catalytic effect. The efficiency of zinc protection by cathodic polarization is low. The high rate of zinc spontaneous dissolution would require high-density external cathodic current to be applied since the polarizability of zinc is low. Application of such cathodic current densities would result in enhanced hydrogen evolution that is quite dangerous, as well as a large consumption of external polarizing current. In view of the above, the feasibility of zinc protection from acid corrosion by insoluble inner-complex compounds, namely, Zn chelates, is of certain interest. The specific features of metal corrosion in the presence of oxyazomethine have been studied

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Section: R-nhmentioning

confidence: 99%