Abstract
The electrochemical oxidation of α-Al–Mg2Si–Sc alloys doped with small amounts of Zr and Mn in a 3% NaCl solution is studied using the potentiodynamic anodic polarization method, quantitative Auger electron spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and atomic absorption spectroscopy. It is established that there are two ranges of anodic potential (from stationary to –0.71 V and higher) and, accordingly, two stages of corrosion: (i) formation of protective films containing α-Al2O3, SiO2, and silicium solid phases in a protective film on the samples and passage of Mg2+ and SiO3 2– ions into solution and (ii) formation of lower magnesium silicide, MgSi, in addition to the solid phases. It is shown that zirconium and manganese serve as cathodic areas and substantially inhibit the corrosion of the alloys at the second (basic) stage (especially at Zr and Mn aggregations).
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