Abstract
The paper presents results of an experimental research of anodic behaviour of Zn22Al alloy doped with gallium in corrosion-active environments HCl, NaCl and NaOH. The electrochemical potentials of corrosion, pitting formation and repassivation of gallium-doped alloys are shifted towards positive values compared to the basic Zn22Al alloy. Alloys, containing 0.01–1.0 wt% gallium, in the pH range from 3 to 9 are the most resistant to pitting corrosion. The corrosion rate of alloys micro doped (0.01–0.1%) with gallium is 1.5–2.5 times lower than that of the basic Zn22Al alloy. The corrosion products of the studied alloys consist of protective oxide films of ZnO, Ga 2 O 3 , ZnAl 2 O 4 , Al 2 O 3 ·Ga 2 O 3 .
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