To evaluate the cathodic protection properties of four kinds of magnesium alloy sacrificial anode materials in circulating water cooling system,four days accelerated test method has been utilized to measure work potential and current efficiency,meanwhile anode polarization curve.Dissolution morphology and corrosion products have been characterized by electrochemical workstation,scanning electron microscope and energy disperse spectroscopy respectively.The results show that in two kinds of circulating water medium four kinds of magnesium alloy sacrificial anode materials appeared Activation polarization behavior and even dissolution morphology.The work potentials of High purity magnesium and M1C are slightly negative than that of AZ63B and AZ31B,while current efficiency order is ranked as high purity magnesium,AZ63B,M1C,AZ31B.Hence,in cathodic protection design practice,results from this paper could be considered as well as economy to choose proper materials comprehensively,and it should be noted that magnesium hydroxide precipitation may form on the surface of magnesium anode materials.
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