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.
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Original Russian Text © V. P. Grigor’eva, S. P. Shpan’koa, E. V. Plekhanovaa, A. S. Burlovb, and V. A. Anisimovab, published in Korroziya: Materialy, Zashchita, 2011, No. 4, pp. 39–43.
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Grigor’ev, V.P., Shpan’ko, S.P., Plekhanova, E.V. et al. 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. Prot Met Phys Chem Surf 48, 764–768 (2012). https://doi.org/10.1134/S2070205112070064
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DOI: https://doi.org/10.1134/S2070205112070064