Changing the second phase distribution shape and improving the corrosion resistance of Mg-6.7Y-2.5Zn alloy by addition of trace Ta

Of the alloying additions to magnesium to date, Ta has not been widely studied. Herein, the effect of Ta on the microstructure and corrosion of Mg-6.7Y-2.5Zn was investigated using optical microscopy, scanning electron microscopy, electrochemical measurements and mass loss. The results showed that the addition of Ta can effectively improve the corrosion resistance of Mg-6.7Y-2.5Zn alloy and change the local corrosion to uniform corrosion. The addition of Ta can rapidly form a dense corrosion product film on Mg-6.7Y-2.5Zn alloy, thus effectively preventing the later corrosion.