  The results of investigations of the corrosion resistance of Al-Mg-Sc-Zr
alloys with varying Mg content and different Sc/Zr ratios are presented. The
objects of investigations were the Al-Mg-Sc-Zr alloys with total Sc + Zr
content of 0.32 wt%. The concentration of Sc and Zr in the alloys varied with
the increments of 0.02 wt%. The alloys were produced by induction casting. The
effect of annealing temperature on the microhardness and electrical resistivity
of the Al-Mg-Sc-Zr alloys was investigated. Corrosion tests were carried out in
a medium simulating intergranular corrosion in aluminum alloys. Electrochemical
studies and mass loss tests were performed. An increase in the Sc concentration
and a decrease in the Zr one were shown to result in an increase in the
corrosion rate. The primary Al3(ScxZr1-x) particles were found to have the main
effect on the corrosion resistance of Al-Mg-Sc-Zr alloys. The dependence of the
corrosion current on the annealing temperature of the Al-Mg-Sc-Zr alloy was
found to have a non-monotonous character (with a maximum).
