Improved corrosion resistance of extruded Mg–8Sn–1Zn–1Al alloy by microalloying with Mn

We report that microalloying with Mn substantially enhances the corrosion resistance of extruded Mg–8Sn–1Zn–1Al alloy. The corrosion rates, measured by immersion tests in 0.6 M NaCl solution at 25 °C, were 4.37 and 246.72 mm y−1 for the quaternary alloys with and without 0.1 wt% Mn, respectively. The enhanced corrosion resistance due to Mn microalloying is attributed to reduced H2 evolution rate, attained by a change in the type of Al-containing intermetallic particles, which led to a reduction of the particles’ electrochemical nobility.

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