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Application of Pearson’s principle to interpretation of the duration of the residual protective effect of organic inhibitors as a function of the nature of a metal and anion

  • V. P. Grigor’ev
  • S. P. Shpan’ko
  • E. V. Plekhanova
  • A. S. Burlov
  • V. A. Anisimova
Corrosion Inhibitors

Abstract

Residual inhibition coefficients K t of acidic corrosion by a mixture of an organic inhibitor and an anionic additive for Al, Zn, Fe, and Ni decrease linearly in time; the duration of the residual protective effect depends linearly on the logarithm of the anionic additive concentration in the preadsorption solution. The effect of anions on the values of K t and τ for the studied mixtures is determined by the nature of the metal and anion. It is established on the basis of Pearson’s principle of hard and soft acids that the K t and τ values grow upon an increase in the organic inhibitor concentration in preadsorption solutions, irrespective of the nature of the metal.

Keywords

corrosion inhibitors residual protective effect Pearson’s principle 

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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • V. P. Grigor’ev
    • 1
  • S. P. Shpan’ko
    • 1
  • E. V. Plekhanova
    • 1
  • A. S. Burlov
    • 2
  • V. A. Anisimova
    • 2
  1. 1.Southern Federal UniversityRostov-on-DonRussia
  2. 2.Research Institute of Physical and Organic ChemistrySouthern Federal UniversityRostov-on-DonRussia

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