Abstract
The effect of Sn alloying (0.5, 1.0, 2.0 wt%) on microstructure and corrosion behavior of dilute Mg-2Zn-xSn-0.5Ca rolled sheets is illuminated. The corrosion resistance first increases and then decreases with raising Sn content. The alloy with 1 wt% Sn shows the lowest corrosion rate of ∼2.1 mm/y, decreased by ∼63 % compared with Sn-free alloy. Although nobler MgSnCa phase is formed after alloying, more protective oxide film containing SnO2 is also formed, which effectively hinders localized corrosion. However, at 2 wt% Sn addition, detrimental effect of MgSnCa overwhelms positive effect of Sn on film, thus deteriorating corrosion resistance.
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