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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。
In this paper, a high potential Mg-Mn sacrificial anode extrusion die was designed and the effects of extrusion process parameters on the surface forming and electrochemical properties of the anode were studied. The main design parameters of the extrusion die are as follows: the center of the three holes is symmetrically shunted, the shunt hole has a taper, the initial shunt ratio of the shunt holes is 16, the shunt ratio of the tail is 27.5, the center of the shunt bridge is provided with a steel core extrusion hole, Cylindrical shape, the height of the welding chamber is 30 mm and the length of the sizing belt is 25 mm. The experimental results show that the designed planar splitter mold can meet the requirement of squeezing the inner embedded Mg-Mn sacrificial anode. When the extrusion ratio of Mg-Mn anode is in the range of 3.25 ~ 29.15, the surface quality of the anode is good, and the shape error meets the requirements of the anode. Extrusion deformation makes the impurity phase distribution more uniform, reducing the uneven degree of anodic corrosion, so that the anode current efficiency and open-circuit potential relative to the as-cast anode significantly improved.