锻压技术

高电位Mg-Mn牺牲阳极挤压模具设计和工艺研究

英文标题：Study on design of extruded mold and extrusion process of wrought Mg-Mn magnesium sacrificial anode

作者：侯军才

单位：陕西理工学院

分类号：

出版年,卷(期):页码：2015,40(10):106-111

摘要：

本文设计了高电位Mg-Mn 牺牲阳极挤压模具，研究了挤压工艺参数对阳极表面成形和电化学性能的影响。挤压模具的主要设计参数为：3孔中心对称分流，分流孔具有锥度，分流孔的始端分流比为16，尾部的分流比为27.5，分流桥的中心设置钢芯挤出孔，焊合室的形状为圆柱形，焊合室的高度为30 mm，定径带长度为25 mm。试验结果表明，所设计的平面分流模具能够满足挤压内部镶嵌钢芯Mg-Mn牺牲阳极的要求。Mg-Mn阳极的挤压比在3.25～29.15范围内时，阳极表面质量良好，形状误差满足阳极的使用要求。挤压变形使杂质相分布更均匀，降低了阳极不均匀腐蚀的程度，使阳极的电流效率和开路电位相对于铸态阳极显著提高。
关键词：分流孔; 焊合室形状; 挤压速度; 电化学性能; 显微组织; Mg-Mn 牺牲阳极

Extrusion mould was designed for the high potential Mg-Mn sacrificial anode and the effects of process parameters on surface quality and electrochemical properties of the Mg-Mn anodes were also investigated. The main structural parameters were three tapered divergent orifices symmetrically distributed, the divergent ratio of the start and the butt of 16 and 27.5 respectively, steel core extrusion orifices set on the center of the divergent bridge, cylindrical seam room and the height of 30 mm, and the working band of 25 mm. The results show that the plain divergent mould is well designed for extruding the Mg-Mn sacrificial anode with inner steel core. When the extrusion ratio is ranging from 3.25 to 29.15, better surface quality can be obtained and the shape error can meet the standard for sacrificial anode. The phases formed by impurity elements can be more homogeneously distributed after extrusion deformation decreasing the extent of localized corrosion, resulting in that the current efficiency and open potential are dramatically increased compared to the as-cast anode.

基金项目：

陕西省科技厅科技基金资助项目(2011JE009)；陕西省教育厅科技基金资助项目 (12JS034)

侯军才(1980-)，男，博士，讲师

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