Effects of solution treatment before extrusion on the microstructure, mechanical properties and corrosion of Mg-Zn-Gd alloy in vitro

摘要

The microstructure, mechanical properties and corrosion of Mg-2.4Zn-0.8Gd (wt.%) alloy with and without solution treatment before extrusion were investigated in vitro. The volume of secondary phases decreased after solution treatment, leading to more homogeneous microstructure distribution of as extruded samples. The solution treatment before extrusion contributed to an elongation increase by 24%, and corrosion resistance was improved by about 20% according to hydrogen evolution and weight loss test. Electrochemical test also confirmed the improvement of corrosion resistance. With solution treatment before extrusion, the corrosion morphology was transformed from localized pitting corrosion to uniform corrosion due to the more homogeneous microstructure. (C) 2017 Elsevier Ltd. All rights reserved.