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The corrosion fatigue behavior of extruded magnesium alloys AZ31 and ME20 was characterized by means of load increase tests in 5 wt.-% NaCl solution. The results were correlated with the respective corrosion behaviors investigated in immersion tests and by means of microstructural investigations after precorrosion. ME20 exhibited a superior corrosion resistance compared to AZ31, probably as a result of an enhanced passivation tendency due to grain refinement because of the presence of rare earth alloying elements. Accordingly, no differences in the cyclic deformation behaviors of ME20 in air and 5 wt.-% NaCl solution were observed in the load increase tests, while AZ31 exhibited a reduction of the estimated fatigue strengths as well as signs of embrittlement due to the mechanical-medial load.

Corrosion fatigue assessment of extruded magnesium alloys AZ31 and ME20