Influence of solution treatment on microstructure,mechanical and corrosion properties of Mg-4Zn alloy

摘要

The solution treatment parameters,mechanical properties and corrosion behavior of binary Mg-4Zn alloy were investigated.The results showed that after the solution treatment at 335°C for 16 h,Mg-4Zn alloy had an ultimate tensile strength of 184.13 MPa and elongation of 9.43%.Furthermore,the corrosion resistance was evaluated by electrochemical measurements and immersion tests in 3.5%NaCl solution.The results revealed that the corrosion current density of the solution treatment Mg alloy was 11.2µA/cm^(−2),it was lower than 15.8µA/cm^(−2) for the as-cast Mg alloy under the same conditions,which was greatly associated with the micro-cathode effect of the second phases.