SiC<sub>p</sub>尺寸对铸态AZ91镁合金显微组织与腐蚀性能的影响

doi:10.11902/1005.4537.2022.006

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 135-142 CSTR: 32134.14.1005.4537.2022.006 DOI: 10.11902/1005.4537.2022.006

研究报告

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SiC_p尺寸对铸态AZ91镁合金显微组织与腐蚀性能的影响

吕鑫¹, 邓坤坤¹^,²(

), 王翠菊¹, 聂凯波¹, 史权新¹, 梁伟¹^,²

^1.太原理工大学材料科学与工程学院太原 030024
^2.太原理工大学先进材料界面科学与工程教育部重点实验室太原 030024

Effect of SiC_p Size on Microstructure and Corrosion Properties of Cast AZ91 Mg-alloys

LV Xin¹, DENG Kunkun¹^,²(

), WANG Cuiju¹, NIE Kaibo¹, SHI Quanxin¹, LIANG Wei¹^,²

^1.School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
^2.Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China

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摘要:

采用半固态搅拌铸造方法制备出亚微米SiC_p增强AZ91复合材料 (S1)、微米SiC_p增强AZ91复合材料 (M10) 以及双尺度SiC_p增强AZ91复合材料 (S1+M9)。利用OM、SEM、XRD、浸泡法、电化学测试等研究了不同尺寸SiC_p对铸态AZ91镁合金显微组织与腐蚀性能的影响。结果表明，SiC_p的添加可以显著细化AZ91镁合金中半连续网状Mg₁₇Al₁₂相，这归因于SiC_p对Mg₁₇Al₁₂相的异质形核作用。Mg₁₇Al₁₂相能够包裹亚微米SiC_p析出，并且可以依附微米SiC_p表面析出。通过对比含有相同SiC_p体积分数的S1+M9和M10，可以看出S1+M9的耐蚀性相比M10显著降低，表明当SiC_p含量一定时，SiC_p的尺寸从微米变为亚微米会导致AZ91镁合金的耐蚀性降低。

关键词 ： AZ91镁合金, SiC_p, 显微组织, 腐蚀性能

Abstract：

The sub-micron SiC_p, micron SiC_p and dual-scale SiC_p reinforced AZ91 Mg-alloy based composites, namely composites (S1), (M10), and (S1+M9) respectively, were prepared by semi-solid stirring casting method. They were then characterized by means of optical microscope, scanning electron microscope, X-ray diffraction, immersion method, and electrochemical test, etc in terms of the effect of the particle size of SiC_p on the microstructure and corrosion properties of the as-cast AZ91 Mg-alloys. The results show that the addition of SiC_p can refine significantly the semi-continuous network-like Mg₁₇Al₁₂ phase in the AZ91 Mg-alloy, which is attributed to the heterogeneous nucleation effect of SiC_p on the Mg₁₇Al₁₂ phase. The Mg₁₇Al₁₂ phase can be precipitated as Mg₁₇Al₁₂ particles with core of sub-micron SiC_p, and/or directly on the surface of micron SiC_p. By comparing the two composites reinforced with the same volume fraction of SiC_p, it can be found that the corrosion resistance of S1+M9 is significantly lower than that of M10, indicating that when the content of SiC_p is constant, changing the size of SiC_p from micron to sub-micron will reduce the corrosion resistance of the composites.

Key words： AZ91 Mg-alloy SiC_p microstructure corrosion performance

收稿日期: 2022-01-04 32134.14.1005.4537.2022.006

ZTFLH:

TG174

基金资助:国家自然科学基金(52001223);国家自然科学基金(51771128);国家自然科学基金(51771129)

作者简介: 吕鑫，男，1995年生，硕士生

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引用本文:

吕鑫, 邓坤坤, 王翠菊, 聂凯波, 史权新, 梁伟. SiC_p尺寸对铸态AZ91镁合金显微组织与腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2023, 43(1): 135-142.
Xin LV, Kunkun DENG, Cuiju WANG, Kaibo NIE, Quanxin SHI, Wei LIANG. Effect of SiC_p Size on Microstructure and Corrosion Properties of Cast AZ91 Mg-alloys. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 135-142.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.006 或 https://www.jcscp.org/CN/Y2023/V43/I1/135

图1 不同材料的OM和低倍SEM图

图2 不同材料的XRD图

图3 不同材料的高倍SEM图及EDS面扫图

表1 对应图3中标记点的EDS结果

图4 不同材料的析氢量和析氢速率随浸泡时间的变化及失重腐蚀速率图

图5 不同材料在3.5%NaCl溶液中的阻抗图谱

表2 不同材料浸泡0.5 h后所得阻抗谱的电化学拟合参数

表3 对应图6极化曲线拟合结果

图6 不同材料在3.5%NaCl溶液中的极化曲线

图7 不同材料在3.5%NaCl溶液中短时间浸泡后未去除腐蚀产物的腐蚀形貌图

图8 不同材料在3.5%NaCl溶液中浸泡7 d后去除腐蚀产物的腐蚀截面图

图9 相同体积分数不同尺寸SiCp增强AZ91基复合材料的腐蚀机制示意图

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