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Abstract
Previous workers have reported the formation of a monolayer of zinc hydroxide or oxide on zinc amalgam and amalgamated zinc, respectively. In this work the potential step method has been used to detect the number of monolayers formed on solid zinc before passivation occurs in dilute sodium hydroxide solutions. Analysis of the first peak shows two-dimensional formation of a passivating film with instantaneous nucleation. Dependence of the rate constant on hydroxyl ion concentration and potential shows that the rate determining step is the discharge of OH−ions.