Effects of Magnetic Field on the Pre-eutectic Microstructure and Electrochemical Behavior of the Zn-Al Alloy

Liu Jingfu; Li Ming’ao; Gao Zhiyu

doi:10.15980/j.tzzz.2014.05.032

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Effects of Magnetic Field on the Pre-eutectic Microstructure and Electrochemical Behavior of the Zn-Al Alloy
Vol. 34, Issue 5, Pages: 456-459(2014)
Published： 2014 ，
DOI： 10.15980/j.tzzz.2014.05.032

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[1]刘敬福,李明骜,高志玉.定向凝固Zn-Al合金先共晶组织及电化学性能的研究[J].特种铸造及有色合金,2014,34(05):456-459.

Liu Jingfu, Li Ming’ao, Gao Zhiyu. Effects of Magnetic Field on the Pre-eutectic Microstructure and Electrochemical Behavior of the Zn-Al Alloy. [J]. Special Casting & Nonferrous Alloys 34(5):456-459(2014)
[1]刘敬福,李明骜,高志玉.定向凝固Zn-Al合金先共晶组织及电化学性能的研究[J].特种铸造及有色合金,2014,34(05):456-459. DOI： 10.15980/j.tzzz.2014.05.032.

Liu Jingfu, Li Ming’ao, Gao Zhiyu. Effects of Magnetic Field on the Pre-eutectic Microstructure and Electrochemical Behavior of the Zn-Al Alloy. [J]. Special Casting & Nonferrous Alloys 34(5):456-459(2014) DOI： 10.15980/j.tzzz.2014.05.032.

摘要

利用水平Bridgman定向凝固装置

在直流稳恒磁场下

对Zn-35Al-2.4Cu合金进行定向凝固试验。通过组织分析、二次枝晶臂间距测试、电化学性能测试

研究了磁场对Zn-Al合金先共晶组织和电化学性能的影响。结果表明

随着凝固速率增加

Zn-Al合金先共晶组织的二次枝晶臂间距逐渐减小

组织细化。在电流为80A、凝固速率为1K·s-1时

Zn-35Al-2.4Cu合金先共晶组织的二次枝晶臂间距最小

为24.294μm

在3.5%的NaCl溶液中腐蚀电流密度最小

为11.62μA/cm2

耐电化学腐蚀性能最优。

Abstract

Zn-Al alloy was fabricated under a transverse direct current steady-state magnetic field by using horizontal Bridgman directional solidification equipment.Effects of magnetic field on the microstructure and electrochemical properties of Zn-Al alloy were investigated through structure analysis

second dendrite arm spacing（SDAS）measurement and electrochemical property testing.The results show that the SDAS is decreased gradually and the microstructure is refined with the increase of the solidification rate. The SDAS reaches up to the minimum value of 24.294μm

and corrosion current density is 11.62 μA/cm2 in 3.5% NaCl solution at the current intensity of 80Aand solidification rate of 1K·s-1.