Zn-7Mg合金热处理显微组织演变及耐蚀性能研究

doi:10.11902/1005.4537.2016.046

中国腐蚀与防护学报

2017, Vol. 37

Issue (4): 347-353 DOI: 10.11902/1005.4537.2016.046

研究报告

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Zn-7Mg合金热处理显微组织演变及耐蚀性能研究

牛振国^1,², 郭浦山¹, 叶宏², 杨丽景¹(

), 许赪¹, 宋振纶¹

1 中国科学院宁波工业技术研究院慈溪生物医学工程研究所宁波 315201
2 重庆理工大学材料科学与工程学院重庆 400054

Microstructure Evolution and Corrosion Behavior of Degradable Zn-7Mg Alloy After Heat Treatment

Zhenguo NIU^1,², Pushan GUO¹, Hong YE², Lijing YANG¹(

), Cheng XU¹, Zhenlun SONG¹

1 Cixi Institute of Biomedical Engineering, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China

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摘要:

研究了可降解Zn-7Mg合金经不同时间热处理后的显微组织演变及耐蚀性能。设计了锌镁合金Zn-7Mg材料,通过改变热处理时间获得Mg₂Zn₁₁相。通过EDS和ICP确定了锌镁合金的成分,运用OM和SEM分析合金的微观组织,利用XRD谱表征合金的物相组成,采用电化学方法测试合金的耐蚀性能。结果表明,Zn-7Mg合金在铸态时主要由α-Zn和MgZn₂两相组成,热处理时包晶反应迅速发生。Zn-7Mg合金热处理后的平衡组织为Mg₂Zn₁₁相和少量残余的MgZn₂相;电化学开路电位和电化学阻抗谱分析表明,Mg₂Zn₁₁在PBS溶液中的耐腐蚀性能较纯Zn差,在实际生产中应避免Mg₂Zn₁₁的产生。

关键词 ：锌合金, 热处理, 显微组织, 腐蚀

Abstract：

Microstructure evolution and corrosion behavior of a degradable Zn-7Mg alloy after heat treatment was investigated by means of inductively coupled plasma emission spectrometer (ICP) and energy dispersive spectrometer (EDS), optical microscope (OM), scanning electron microscope (SEM) and X-ray diffraction (XRD) as well as electrochemical test in phosphate buffered saline (PBS). Results indicated that, the microstructure of the as-cast Zn-7Mg alloy was mainly composed of α-Zn and MgZn₂, while the peritectic reaction occurred rapidly during heat treatment. After heat treatment the Zn-7Mg alloy was composed of stable phase Mg₂Zn₁₁ and a little of residual MgZn₂. The phase Mg₂Zn₁₁ showed lower corrosion resistance in PBS solution than the pure zinc, therefore, the phase Mg₂Zn₁₁ should be avoided in actual production.

Key words： Zn alloy heat treatment microstructure corrosion

收稿日期: 2016-04-06

ZTFLH:

TG146.1+3

基金资助:国家自然科学基金 (51301193),浙江省公益项目 (2015C31031) 和宁波市自然科学基金 (2015A610070)

作者简介:

作者简介牛振国,男,1987年生,硕士生

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引用本文:

牛振国, 郭浦山, 叶宏, 杨丽景, 许赪, 宋振纶. Zn-7Mg合金热处理显微组织演变及耐蚀性能研究[J]. 中国腐蚀与防护学报, 2017, 37(4): 347-353.
Zhenguo NIU, Pushan GUO, Hong YE, Lijing YANG, Cheng XU, Zhenlun SONG. Microstructure Evolution and Corrosion Behavior of Degradable Zn-7Mg Alloy After Heat Treatment. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 347-353.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.046 或 https://www.jcscp.org/CN/Y2017/V37/I4/347

图1 Zn-7Mg合金铸态金相显微组织

图2 Mg-Zn二元合金相图[25]

图3 铸态锌镁合金的SEM像

表1 图3中不同位置的EDS结果

图4 不同热处理时间后Zn-7Mg合金的XRD谱

图5 Zn-7Mg合金经不同时间热处理后的金相组织

图6 Zn-7Mg合金经不同时间热处理后的SEM像

表2 图6a中不同位置的EDS分析结果

图7 纯Zn和Mg2Zn11在PBS溶液中的开路电位曲线

图8 纯Zn和Mg2Zn11的电化学阻抗谱及等效电路

表3 等效电路元件拟合值

图9 纯Zn和Mg2Zn11的电化学极化曲线

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