Abstract
When bare nickel surface comes in direct contact with aqueous solution of proper ions the equilibrium potential E e q of the couple Ni/Ni 2+ at the metal-solution interface is established for short period of time Δt. The passivation of fresh surface at, t > Δt which results in considerable inhibition of both anodic and cathodic reactions and accompanies by deviation of E from E e q is due to the formation of monolayer of chemisorbed anions. The passivation effect increases in the order: F −, SO 4 2−, Cl −, Br −, J −. The dissolution of Ni in active state involves consequtive charge transfer steps and disproportionation of reaction intermediates — Ni + ions.
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