Abstract
SUMMARYThe corrosion behaviour of Zn coatings deposited from acid and alkaline solutions was studied under the neutral salt spray conditions. XPS, EIS and voltammetric measurements were applied for the characterisation of Zn coatings after corrosion testing, while AFM was used for surface morphology examination. Lower corrosion rates were determined for the coatings deposited from the alkaline non-cyanide solution. Composition of the corrosion product film was determined to be the same for both types of coatings, therefore the differences in their corrosion behaviour can be related to the structural properties of the inner oxide layer of the corrosion product film. A thinner, but more compact oxide film on the coatings, deposited from the alkaline bath, possessed passivating characteristics, contrary to the coatings deposited from the acid electrolyte.
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