Effect of Oxidants on Protection of Mild Steel by Zinc Hydroxyethylidenediphosphonate
G. V. Zinchenko and Yu. I. Kuznetsov
Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
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Received May 20, 2004
Abstract — The corrosion and electrochemical behavior of 
3 steel and Armco iron in soft corrosive water at 20 and 80°C in the presence of a zinc complex with hydroxyethylidenediphosphonic acid (HEDPZn) and sodium nitrite and m-nitrobenzoate was studied. It was found that a mixture of this nontoxic phosphonate with oxidants inhibits steel (iron) corrosion or, at least, can be used in lower protective concentrations. The mixed inhibitor is effective because of its protective film (mainly composed of HEDPZn) that impedes both the electrode reactions. The components of such a mixture showed synergism of their inhibitive effects only when the concentration of HEDPZn was above a certain critical value and a certain [HEDPZn]/[oxidant] ratio was used.
3 steel and Armco iron in soft corrosive water at 20 and 80°C in the presence of a zinc complex with hydroxyethylidenediphosphonic acid (HEDPZn) and sodium nitrite and m-nitrobenzoate was studied. It was found that a mixture of this nontoxic phosphonate with oxidants inhibits steel (iron) corrosion or, at least, can be used in lower protective concentrations. The mixed inhibitor is effective because of its protective film (mainly composed of HEDPZn) that impedes both the electrode reactions. The components of such a mixture showed synergism of their inhibitive effects only when the concentration of HEDPZn was above a certain critical value and a certain [HEDPZn]/[oxidant] ratio was used.