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采用直冷半连续铸造法制备了高电位Mg-Mn牺牲阳极,对其化学成分、金相组织、夹杂物的分布、电流效率和开路电位进行了研究,并与金属型制备的铸锭进行对比。结果发现,两种工艺下基体组织相同,直冷半连续铸造铸锭的晶粒细小,晶内和晶界上未发现氧化夹杂和熔剂夹杂,这使得镁阳极自腐蚀电偶对中的阴极和阳极的电位差减小,阴极和阳极的面积比减小,使得其电流效率和开路电位明显升高,且内、外电化学性能基本一致。
The high potential Mg-Mn sacrificial anode was prepared by direct cooling semi-continuous casting method. The chemical composition, microstructure, distribution of inclusions, current efficiency and open circuit potential were studied and compared with that of metallic ingot . The results show that the matrix microstructure of the two processes are the same, the grain size of the ingot in direct-cooling semi-continuous casting is small, and no inclusions of oxide inclusions and inclusions are observed in the grain boundaries and in the grain boundaries. The anode potential difference decreases, the cathode and anode area ratio decreases, making the current efficiency and open circuit potential increased significantly, and internal and external electrochemical properties are basically the same.