<strong>LPSO</strong>相含量对挤压态<strong>Mg-Y-Zn-Mn</strong>合金耐腐蚀性能的影响

doi:10.11900/0412.1961.2024.00230

金属学报

2025, Vol. 61

Issue (12): 1803-1816 DOI: 10.11900/0412.1961.2024.00230

研究论文

本期目录 | 过刊浏览

LPSO相含量对挤压态Mg-Y-Zn-Mn合金耐腐蚀性能的影响

江舒佳¹, 杨宏冉¹, 李传强¹(

), 王乃光¹, 王德升²^,³(

)

1 广东工业大学材料与能源学院广州 510006
2 洛阳船舶材料研究所海洋腐蚀与防护全国重点实验室洛阳 471023
3 上海交通大学材料科学与工程学院上海 200240

Effect of Long-Period Stacking Ordered Phase Content on the Corrosion Resistance of As-Extruded Mg-Y-Zn-Mn Alloy

JIANG Shujia¹, YANG Hongran¹, LI Chuanqiang¹(

), WANG Naiguang¹, WANG Desheng²^,³(

)

1 School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
2 National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Luoyang 471023, China
3 School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

江舒佳, 杨宏冉, 李传强, 王乃光, 王德升. LPSO相含量对挤压态Mg-Y-Zn-Mn合金耐腐蚀性能的影响[J]. 金属学报, 2025, 61(12): 1803-1816.
Shujia JIANG, Hongran YANG, Chuanqiang LI, Naiguang WANG, Desheng WANG. Effect of Long-Period Stacking Ordered Phase Content on the Corrosion Resistance of As-Extruded Mg-Y-Zn-Mn Alloy[J]. Acta Metall Sin, 2025, 61(12): 1803-1816.

全文: PDF(7163 KB) HTML

摘要:

含长周期堆垛有序(LPSO)结构的Mg-Y-Zn系合金具有优异的力学性能，但LPSO相含量对挤压态镁合金耐腐蚀性能的影响尚不清楚。本工作通过控制Zn和Y含量来调控LPSO相含量，研究挤压态Mg-Y-Zn-Mn合金的耐腐蚀性能，揭示LPSO相含量及其形态对挤压态镁合金耐腐蚀性能的影响规律；系统地研究了具有不同含量LPSO相的挤压态Mg-xY-yZn-0.1Mn (x = 2、4、8，质量分数，%；x / y = 2)合金的微观组织和耐腐蚀性能。结果表明，LPSO相含量随Zn、Y含量的增加而增多，其中Zn、Y含量最少的Mg-2Y-1Zn-0.1Mn (WZ21M)合金中的LPSO相为细小块状；Zn、Y含量较多的Mg-4Y-2Zn-0.1Mn (WZ42M)中的LPSO相沿挤压方向呈流线分布；Mg-8Y-4Zn-0.1Mn (WZ84M)合金中LPSO相最多，也呈流线分布，但其相邻LPSO相的间距明显减小。在3.5%NaCl溶液中的腐蚀实验结果表明，3种合金的耐腐蚀性能顺序是：WZ84M < WZ42M < WZ21M，LPSO相含量最多的WZ84M合金表现出最差的耐腐蚀性能，这主要归因于大量的LPSO相增强了微电偶效应，而流线分布的LPSO相不能有效阻碍腐蚀扩展。

关键词 ： Mg-Y-Zn合金, LPSO相, 微观组织, 耐腐蚀性能

Abstract：

Mg alloys with high-strength and long-period stacking ordered (LPSO) phases are promising materials for lightweight structural applications because of their exceptional properties. However, corrosion remains a major challenge that limits their widespread use. The influence of the LPSO phase on the corrosion behavior of these alloys is substantial. On one hand, the microgalvanic effect between the LPSO phase and α-Mg matrix can accelerate corrosion. On the other hand, the LPSO phase may serve as an effective barrier that hinders the spread of corrosion in as-cast Mg alloys. Although the distribution of the LPSO phases considerably influences the corrosion resistance, the relationship between the LPSO phase content and the corrosion resistance remains poorly understood. In this work, a series of as-extruded Mg-xY-yZn-0.1Mn (x = 2, 4, and 8, mass fraction, %; x / y = 2) alloys with varying LPSO contents and morphologies were prepared, and their corrosion resistance were investigated in detail. Microstructural analyses were conducted using OM, SEM, and XRD. Corrosion resistance was evaluated through hydrogen evolution, mass loss, and electrochemical testing. Corrosion morphologies were examined using OM, SEM, confocal laser scanning microscopy (CLSM), while the local corrosion potential was analyzed using scanning Kelvin probe force microscopy (SKPFM). The results showed that the alloys primarily consisted of α-Mg and LPSO phases. The volume fraction of LPSO increased with the elevation of Zn and Y contents, and the morphology of the LPSO phases varied among the alloys. In the Mg-2Y-1Zn-0.1Mn (WZ21M) alloy, which exhibited the lowest Zn and Y contents, the LPSO phases appeared as small blocks. In contrast, the Mg-4Y-2Zn-0.1Mn (WZ42M) alloy, with moderate Zn and Y contents, featured LPSO phases arranged zonally along the extrusion direction. The Mg-8Y-4Zn-0.1Mn (WZ84M) alloy, which exhibited the highest LPSO content, also exhibited a zonal distribution of LPSO phases but with a considerably reduced spacing between adjacent phases. Corrosion tests performed in a 3.5%NaCl (mass fraction) solution revealed that the corrosion resistance decreased in the following order: WZ84M < WZ42M < WZ21M. The WZ21M alloy, exhibited a smoother discharge process and a more negative discharge potential across different current densities, indicating higher corrosion resistance compared to the WZ42M and WZ84M alloys. Conversely, the WZ84M alloy, showed the poorest corrosion resistance due to the pronounced microgalvanic effect between the LPSO phase and α-Mg matrix. The deformed LPSO phases in the as-extruded alloy were less effective in inhibiting corrosion spread. The WZ21M alloy benefited from reduced microgalvanic effects, leading to improved corrosion resistance. Therefore, the corrosion resistance of as-extruded Mg-Y-Zn-Mn alloys is inversely related to the LPSO content, with higher LPSO contents generally resulting in decreased resistance due to intensified microgalvanic effects. Additionally, the morphology of the LPSO phase plays a critical role in determining corrosion resistance.

Key words： Mg-Y-Zn alloy LPSO phase microstructure corrosion resistance

收稿日期: 2024-07-10

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(52171067);广东省自然科学基金项目(2024A1515030065);广东省自然科学基金项目(2023A1515012299);广东省科技计划国际科技合作项目(2023A0505050152);广州市基础与应用基础研究项目(2024A04J6299);广州市青年科技人才托举工程项目(QT2024-012)

通讯作者: 李传强，chuanqiang.li@gdut.edu.cn，主要从事镁合金材料微观组织、力学与腐蚀性能研究; 王德升，wangdesheng07@163.com，主要从事船舶用轻合金及应用性能研究

Corresponding author: LI Chuanqiang, associate professor, Tel: 13060861457, E-mail: chuanqiang.li@gdut.edu.cn; WANG Desheng, senior engineer, Tel: 15038673657, E-mail: wangdesheng07@163.com

作者简介: 江舒佳，女，1999年生，硕士生

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图1 样品测试面的取样示意图

图2 挤压态Mg-2Y-1Zn-0.1Mn (WZ21M)、Mg-4Y-2Zn-0.1Mn (WZ42M)和Mg-8Y-4Zn-0.1Mn (WZ84M)合金的XRD谱

图3 挤压态WZ21M、WZ42M和WZ84M合金的OM像

图4 挤压态WZ21M、WZ42M和WZ84M合金的SEM像

图5 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl溶液中的析氢速率和失重速率

图6 挤压态WZ21M、WZ42M和WZ84M合金的极化曲线、电化学阻抗谱(EIS)及等效电路

表1 挤压态WZ21M、WZ42M和WZ84M合金极化曲线拟合结果

Alloy

R_s

Ω·cm²

R_t

Ω·cm²

Y_dl

μΩ^-1·cm^-2·s $n d l$

n_dl

R_f

Ω·cm²

Y_f

μΩ^-1·cm^-2·s $n f$

n_f

R_L

Ω·cm²

H·cm^-2

WZ21M

24.4

606.0

13.40

0.93

149.2

6200.3

0.87

2131.0

31598

WZ42M

25.2

511.2

18.05

0.93

291.1

5076.9

0.87

1078.0

13511

WZ84M

24.3

459.4

16.14

0.94

147.8

6509.7

0.81

2345.0

16867

表2 挤压态WZ21M、WZ42M和WZ84M合金EIS拟合结果

图7 挤压态WZ21M、WZ42M和WZ84M合金在不同电流密度下的放电曲线

图8 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl溶液中浸泡不同时间后的OM原位观察像

图9 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl溶液中浸泡1 h并去除腐蚀产物后的SEM像

图10 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl溶液中浸泡24 h并去除腐蚀产物后的SEM像

图11 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl溶液中浸泡24 h并除去腐蚀产物后的三维腐蚀形貌

图12 挤压态WZ21M、WZ42M和WZ84M合金在3.5%NaCl 溶液中浸泡24 h并去除腐蚀产物的截面SEM像

图13 挤压态WZ21M、WZ42M和WZ84M合金的SKPFM测试结果

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