Improved corrosion resistance of extruded Mg–8Sn–1Zn–1Al alloy by microalloying with Mn
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Scripta Materialia, ISSN: 1359-6462, Vol: 109, Page: 38-43
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- Materials Science; Physics and Astronomy; Magnesium alloy; Extrusion; Intermetallic particle; Corrosion
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 H 2 evolution rate, attained by a change in the type of Al-containing intermetallic particles, which led to a reduction of the particles’ electrochemical nobility.