Inhibition of Copper and Zinc Dissolution with 5(6)-Nitrobenzoimidazoles in Phosphate Electrolytes
Yu. I. Kuznetsov and L. P. Podgornova
Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
e-mail: Этот e-mail защищен от спам-ботов. Для его просмотра в вашем браузере должна быть включена поддержка Java-script
Received December 9, 2004
Abstract — Effects of the concentration and chemical structures of 2-substituted 5(6)-nitrobenzoimidazoles (5(6)-NO2-2-R-BIs) on the dissolution of copper and zinc in phosphate electrolytes were studied. Introduction of the nitro group into benzoimidazole derivatives was found to make them more effective for copper but less effective for zinc; this is due to an increased degree of dissociation of the nitro derivatives and the possibility of ionic bonding in their complexes. The protective effects of 5(6)-NO2-2-R-BIs on copper and zinc depend on their chemical structures and are accurately described by the equation 
= a 
I. The sign and magnitude of indicate that electron-withdrawing substituents in 5(6)-NO2-2-R-BIs enhance the protection of copper, while electron-donating ones enhance the protection of zinc; this is due to different abilities of these metals to form - and 
-bonds in their complexes.
= a I. The sign and magnitude of indicate that electron-withdrawing substituents in 5(6)-NO2-2-R-BIs enhance the protection of copper, while electron-donating ones enhance the protection of zinc; this is due to different abilities of these metals to form - and -bonds in their complexes.