EFFECT OF ACTIVATORS ON THE LOCAL DEPASSIVATION OF OXIDATED STEEL

The local depassivation of oxidated low-carbon steel containing variou s activating anions was studied. The dependence of the pit initiation potential (E(p)) on the constants of hydrophobicity of atoms and atomi c groups constituting the activator and on their polarizabilities or P alm's phi-constants of substituents was revealed. This equation differ s from those obtained previously by a higher free member, which is att ributed to localization of part of the potential drop across the magne tite film. The possibility of further increasing E(p) and stabilizing the passive state of oxidated steel by additional treatment in a 10% a queous solution of inhibitors based on higher carboxylic acids was dem onstrated. The reasons for an increase in E(p) due to the oxidation of steel and its subsequent treatment with an inhibitor solution were an alyzed.