The effect of manganese and chromium on the characteristics of Al-3-5%Mg wrought alloys (Report 2)

Corrosion resistivity (Part 1), Corrosion in seawater with sample of 2.4mm thickness

Abstract

In order to confirm the effect of Mn and Cr in Al-3-5%/Mg alloys and of Fe, Si, Cu, Ti, in Al-4-4.5%Mg-0.5%Mn-0.2%Cr alloy on the corrosion resistivity, changes of tensile properties during immersion of the samples in the sea-water for up to 12 months were tested.
It is seen that, in general, Al-Mg binary alloys are the best and the addition of Mn, Cr, Fe or Cu decreases corrosion resistivity, wheras the effects of Si, Zn and Ti being small.