Corrosion Susceptibility of a Mg Alloy ZAME1100 Thin-Wall Extruded Hollow-Beam Profile

Abstract The objective of this work is to determine the corrosion susceptibility of Mg alloy ZAEM 1100 extruded beam profiles in NaCl (aq). Cross-section examination of the microstructure using microscopy techniques revealed three metallurgical zones: (i) a very thin altered surface zone produced from die friction, (ii) a recrystallized coarse-grained intermediate zone and (iii) a fibrous fine-grained core. The relative corrosion susceptibility of these three zones as the starting surface was investigated using potentiodynamic polarization measurements in 0.1 M NaCl (aq). The results were analyzed and interpreted by considering the role played by microstructure features.