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ZK60-1Nd镁合金的组织结构及腐蚀行为
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辽宁科技大学 材料与冶金学院,辽宁科技大学 材料与冶金学院,辽宁科技大学 材料与冶金学院,辽宁科技大学 材料与冶金学院,辽宁科技大学 材料与冶金学院

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国家自然科学基金资助(项目号51374128)


Microstructure And Corrosion Behavior Of ZK60-1Nd Magnesium Alloy
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University of Science and Technology Liaoning,University of Science and Technology Liaoning,University of Science and Technology Liaoning,University of Science and Technology Liaoning,University of Science and Technology Liaoning

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    摘要:

    通过扫描电镜(SEM),电化学工作站和盐水浸泡失重法研究了ZK60-1Nd镁合金的组织结构及在3.5wt % NaCl水溶液中的腐蚀行为。结果表明:ZK60-1Nd镁合金主要由基体α-Mg相,沿晶界分布的含有稀土Nd的粗大网状共晶组织以及在基体中弥散分布的细小棒状MgZn2相组成。ZK60-1Nd镁合金在3.5wt % 的NaCl水溶液中的腐蚀速率为0.2 mg.cm-2.h-1;经过400 ℃保温96 h后,部分共晶相熔断成尺寸约为0.5 μm的颗粒,腐蚀速率降低到0.1 mg.cm-2.h-1;经过500 ℃保温8.0 h,网状共晶相熔化成分散块状,基体中细小棒状MgZn2相溶解消失,Nd,Zn和Zr元素在基体中含量增加且分布均匀,腐蚀速率达到最低,为0.03 mg.cm-2.h-1。其耐蚀性能改善的主要原因为α-Mg基体中固溶态Nd元素含量的增加导致合金自腐蚀电位提高以及基体α-Mg中腐蚀微电偶数目的减少。

    Abstract:

    Microstructure and the corrosion behavior of ZK60-1Nd magnesium alloy in 3.5 wt % NaCl aqueous solution was studied by scanning electron microscope (SEM) , electrochemical workstation and brine weight loss method. The results indicate that the as-cast microstructure of ZK60-1Nd alloy is mainly composed of matrixα-Mg, a coarse network eutectic phase containing rare earth Nd distribute along the grain boundaries and the distribution of fine MgZn2 phase in the matrix. The corrosion rate of ZK60-1Nd magnesium alloy in 3.5 wt % NaCl aqueous solution was 0.2 mg ? cm-2 ? h-1 in NaCl solution. After homogenization at 300 ℃ for 8.0 h , the microstructure was improved;after annealing at 400 ℃ for 96 h, A portion of the eutectic phase is fused to a particle with a maximum size of 1.5 μm and the corrosion rate is reduced to 0.1 mg.cm-2.h-1; After annealing at 500 ℃ for 8.0 h , fishbone eutectic phase composition of patchy, the MgZn2 phase is dissolvedSintoSmatrix , the contents of Nd, Zn and Zr were increased and the distribution was uniform in the matrix , corrosion rate reached a minimum of 0.03 mg.cm-2.h-1. The main reason for the improvement of corrosion resistance is that the increase of the content of solid solution Nd in matrix α-Mg lead to the improvement of corrosion potential and the decrease in the number of micro galvanic corrosion.

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褚旭,王忠军,张涛,王冬晓,王洪斌. ZK60-1Nd镁合金的组织结构及腐蚀行为[J].稀有金属材料与工程,2018,47(5):1429~1436.[Chu Xu, Wang Zhongjun, Zhang Tao, Wang Dongxiao, Wang Hongbin. Microstructure And Corrosion Behavior Of ZK60-1Nd Magnesium Alloy[J]. Rare Metal Materials and Engineering,2018,47(5):1429~1436.]
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  • 收稿日期:2017-05-09
  • 最后修改日期:2017-08-28
  • 录用日期:2017-09-11
  • 在线发布日期: 2018-06-08
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