摘要
以"硅热还原法"生产的纯镁为原料,采用金属型铸造工艺浇铸了纯镁牺牲阳极,考察了纯镁牺牲阳极的杂质含量在熔铸过程中的变化趋势及其电化学性能和腐蚀形貌。结果表明:纯镁牺牲阳极杂质含量仍然保持较低水平,其电化学性能满足ASTM 843-2003的要求,电流效率最大值达到了54%;纯镁牺牲阳极的开路电位取决于α-Mg基体的电位,α-Mg基体固溶元素较少,电位较负,开路电位较高,其最大值达到了-1.74V(vs SCE)。
The crude magnesium fabricated by magnesium silicothermic process was used as the starting material to fabricate 5 kinds of purified magnesium sacrificial anodes with different impurity contents by metal mold casting process.The variation of impurities in the purified Mg sacrificial anodes during the melting-casting process was investigated.The electrochemical performance and corroded surface morphology of the Mg sacrificial anodes were analyzed.Results indicate that as-fabricated purified Mg anodes have a low level of impurities.According to ASTM 843-2003 standard for M1C high potential magnesium sacrificial anode,all the 5 kinds of anodes are qualified in terms of the electrochemical performance,and their maximum current efficiency is as much as 54%.In the meantime,the open potential of the purified Mg anodes is determined by the potential of α-Mg matrix,since α-Mg matrix with a small amount of solid-solution element has a very negative open potential.
出处
《材料保护》
CAS
CSCD
北大核心
2012年第12期17-19,2,共3页
Materials Protection
基金
陕西理工学院校级项目(SLGQD0745)资助
关键词
纯镁牺牲阳极
电化学性能
腐蚀形貌
熔铸
杂质含量
purified magnesiumsacrificial anode
melting-casting
electrochemical performance
corroded surface morphology
impurity content
