Abstract
Zinc, surface-labelled by exchange with Zn 65Cl 3 solution, was used in a study of corrosion inhibition mechanisms. Corrosion of these Zn 65-labelled specimens in water and dilute salt solutions was accompanied by a slow, continuing loss of activity from the metal surface. By contrast, while the metal remained untarnished in 10 −4M chromate solutions, a rapid loss of activity was observed. Treatment with 10 −4M molybdate solution also produced a rapid initial loss of activity, but corrosion inhibition was only temporary. Other oxidizing and non-oxidizing solutions under similar conditions did not protect the metal or produce rapid loss of zinc from the surface. When specimens labelled by electrodeposited or evaporated Zn 65 were placed in passivating chromate solution, loss of zinc occurred slowly and continued for a considerable time, showing that the barrier film formed by reaction of zinc with chromate ions is not sufficiently impermeable to prevent zinc ions leaving the metal and passing into the solution.
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