The ~1 μm thick films of Mg-25Al-Zn alloy (at.%: Al – ~25, Zn – 0.5–1.0 and Mg – in balance) were formed on glass substrates by the direct current (DC) magnetron-sputtering technique. Electrochemical impedance spectroscopy (EIS) was used to study the shortterm corrosion behavior of as-deposited Mg-25Al-Zn alloy films in ammonium borate solution. As determined, corrosion of alloys was considerably influenced by the microstructure of coatings and by the thickness and electrical resistance of the oxide layer, which developed at the electrode / solution interface. Alloys characterized by the finest grain size and the lesser content of β-phase were more corrosion-resistant. The initial thickness of the oxide layer depended on the alloy formation temperature: it varied from ~5 nm at 10 °C and 40 °C to ~15–20 nm at 150 °C. The EIS method was also used for study of oil-coated Mg-25Al-Zn electrodes. Corrosion behavior of Mg-25Al-Zn alloys coated with a ~5 μm thick film of paraffin mineral oil was very similar. At the same time, it could be noted that paraffin mineral oil suppressed the impact of β-phase. Thickness of the oxide layer decreased during exposure in borate solution. The observed increase in corrosion resistance was attributed to enrichment of the oxide layer with aluminum oxide.

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