热压处理对气相合金化法制备的镁锌合金显微组织和耐蚀性的影响

张国琛, 牛立斌, 高波, 雷声媛, 牛艳娥

doi:10.16577/j.issn.1001-1560.2024.0028

材料保护 >

2024 , Vol. 57 >Issue 2: 12 - 17

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0028

研究篇

热压处理对气相合金化法制备的镁锌合金显微组织和耐蚀性的影响

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¹西安科技大学材料科学与工程学院； ²榆林职业技术学院机电工程系

牛立斌(1972-)，博士，副教授，主要研究方向为轻金属冶炼及其合金化，电话:13319213034，E-mail:dy059＠126.com

收稿日期: 2023-05-04

修回日期: 2023-06-02

录用日期: 2023-06-20

网络出版日期: 2024-03-08

基金资助

陕西省重点研发计划项目(2023-YBGY-090)资助

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Effect of Hot-Pressing Treatment on the Microstructure and Corrosion Resistance of Mg-Zn Alloy Prepared by Gas Phase Alloying Method

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(1.College of Materials Science and Engineering， Xi’an University of Science and Technology， Xi’an 710055， China；2.Department of Mechanical and Electrical Engineering， Yulin Vocational and Technical College， Yulin 719000， China)

NIU Libin (1972-)， Ph.D.， Associate Professor， Research Focus: Light Metal Smelting and Alloying， Tel.:13319213034， E-mail: dy059＠126.com

Received date: 2023-05-04

Revised date: 2023-06-02

Accepted date: 2023-06-20

Online published: 2024-03-08

Supported by

Key R＆D Program of Shaanxi Province(2023-YBGY-090)

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摘要

为了有效改善镁合金的性能，探究在冷凝和热压2 种状态下，锌对镁合金的显微组织和腐蚀行为的影响，采用气相合金化法制备出Mg-Zn 二元合金，并通过光学显微镜(OM)、X 射线衍射仪(XRD)、电子扫描显微镜(SEM)、能谱分析仪(EDX)以及电化学工作站等手段进行研究和分析。结果表明:冷凝态和热压态的合金的物相均由α-Mg，MgZn，Mg7Zn3以及MgZn2相组成。经300～360 ℃、压力为10 MPa 条件下热压40 min 后，合金的显微组织更均匀化、更致密，且逐渐形成条状组织；随着热压温度的升高，合金的腐蚀电流密度下降，耐蚀性增强。当热压温度为320 ℃，时间由4 h 延长到12 h 后，合金的塑性变形程度明显增大，析出细小的Mg7Zn3相增多，且分布均匀，合金的耐蚀性降低。

关键词： Mg-Zn 合金; 气相合金化; 热压; 耐蚀性

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张国琛, 牛立斌, 高波, 雷声媛, 牛艳娥 . 热压处理对气相合金化法制备的镁锌合金显微组织和耐蚀性的影响[J]. 材料保护, 2024 , 57(2) : 12 -17 . DOI: 10.16577/j.issn.1001-1560.2024.0028

Abstract

In order to effectively improve the properties of magnesium alloys， the effects of Zn on the microstructure and corrosion behavior of magnesium alloys under two states of condensation and hot-pressing were explored.The Mg-Zn binary alloy was prepared by gas phase alloying method， and the alloy was studied and analyzed by optical microscopy (OM)， X-ray diffraction (XRD)， scanning electron microscopy(SEM)， energy dispersive X-ray spectroscopy (EDX) and electrochemical workstation.Results showed that the phases of alloy under two states of condensation and hot-pressing were composed of α-Mg， MgZn， Mg7Zn3 and MgZn2 phases.After hot-pressing treatment under the conditions of 300～360 ℃＋10 MPa＋40 min，the microstructure of the alloy became more uniform and denser，which also gradually formed strip structure.With increasing the hot-pressing temperature， the corrosion current density of the alloys decreased， and the corrosion resistance increased.When the time of the hot-pressing treatment extended from 4 h to 12 h at 320 ℃， the degree of the plastic deformation of alloy obviously enhanced， and the fine Mg7Zn3 phases were precipitated and presented the uniform distribution.Besides， the corrosion resistance of the as-obtained alloy was weakened.

Key words： Mg-Zn alloy; gas phase alloying; hot-pressing; corrosion resistance

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