含Mg铝合金牺牲阳极的电流效率及其影响因素  

EFFICIENCY AND EFFECTING FACTORS OF Mg CONTAINING Al ALLOY SACRIFICIAL ANODES

作　　者：孔小东[1] 丁振斌[2] 朱梅五[1] 

机构地区：[1]海军工程大学理学院化学与材料系,武汉430033 [2]海军驻438厂军代表室,武汉430060

出　　处：《中国腐蚀与防护学报》2010年第1期6-10,共5页Journal of Chinese Society For Corrosion and Protection

摘　　要：在铝合金牺牲阳极中添加Mg、Ti、Nb等合金元素,研究它们的含量与存在形式对牺牲阳极性能的影响,分析第二相、晶粒细化等的作用和影响。结果表明:在所讨论的含Mg铝合金牺牲阳极中,会形成一定类型的第二相,进而影响牺牲阳极的电化学性能;理想的Mg含量为2%;加入微量Ti、Nb可以有效细化晶粒,对提高牺牲阳极的电流效率有很好的促进作用,而且单独加入Ti要比同时加Ti、Nb的效果好。Some elements such as Mg,Ti,Nb were added in Al alloy sacrificial anodes.The effects of these elements and correlated second phases on the properties of the anodes were investigated.In the studied anodes, Mg has two existing states which are solid solution and second phase separately.For the second phase,there are T-phase（Al_2Mg_3Zn_3） andη-phase（MgZn_2）,which are anodic and dissolve preferentially related to the anode matrix in the chloride solution.The effects of some factors on the electrochemical properties and solubility behavior of anodes were discussed,which include the category,morphology,quantity and distribution of the second phases.The results confirmed that the homogeneous distribution,regular shape and proper quantity of second phases are beneficial to get best anode efficiency and surface dissolved state.The ideal content of Mg is about 2%in all studied anode,at which the anode efficiency would be close to 90%.In this paper,the effects of trace Ti,Nb were discussed.The trace Ti,Nb is useful to get more fine grain microstructure and bigger anode efficiency,and the effect of independent Ti is better than that of Ti and Nb simultaneously.But for the anode surface dissolved state,the more fine grain microstructure was not corresponding to more uniform surface dissolution;because the trace Ti,Nb would cause the change of distribution,shape and quantity of second phases.

关 键 词：牺牲阳极 铝合金 第二相 电流效率 晶粒细化 

分 类 号：TG174.2[金属学及工艺—金属表面处理]