Effect of Al/Zn Ratio on the Microstructure Mechanical Properties and Corrosion Resistance of Mg Alloy
Using metallographic microscope,stereoscan,XRD,energy spectrometer, electronic universal materials testing machine and Solatron 1287+1260 electrochemical measurement system to analysis the effect of Al/Zn ratio on the microstructure,mechanical properties and corrosion resistance of Mg alloy.When the Al/Zn ratio stands in the range of 1 to 15,the main constituent phases are α phase and β phase.As the Al/Zn ratio is equal to 10,the tensile strength and yield strength get the maximum.The value is 171.2 MPa and 107.5 MPa,and the alloy get the best corrosion resistance through polarization curve and AC impedance curve.Moreover the corrosion rate falls down to the minimum 0.3 mg/((cm~2·d)) by weight loss measurement after immersing in salt water for three days.While the elongation gets the maximum 2.02% as the Al/Zn ratio is equal to 1.when the Al/Zn ratio is less than 1,the main constituent phases are α phase and τ phase(Mg_(32)(Al、Zn)_(49)).