Microstructure and electro-chemical properties of Mg-Sr anode were investigated.The results indicate that the grain size in the Mg-Sr anode can be decreased with the increase of Sr content.The current efficiency and open potential of the anode will reach the peak value of 58.56% and-1.735 Vsce with 0.19% Sr content

while the current efficiency will be decreased and the open potential will be shift positively with the Sr content more than 0.19%.Microgalvanic cell can be formed from Mg17Sr2 phase segregated from boundary and α-Mg phase with 0.19% Sr content

which can inhibit the intergranular corrosion and reduce the grain spallation as well as relieve the deterioration effects of Fe phase to lead to the improvement of current efficiency and the positive shift of open potential as a result of refining grain size and enlarging grain boundary area as well as more uniform inclusion phase distribution.With the Sr content more than 0.19%

excessive Mg12Sr2 phase can increase the self-corrosion rate of the anode

resulting in the decrease of current efficiency and positive shift of open potential.