高压凝固Mg-xAl (x = 3, 5, 7, 9, 12)合金组织结构及耐腐蚀性能

doi:10.11902/1005.4537.2024.333

中国腐蚀与防护学报

2025, Vol. 45

Issue (5): 1265-1276 CSTR: 32134.14.1005.4537.2024.333 DOI: 10.11902/1005.4537.2024.333

研究报告

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高压凝固Mg-xAl (x = 3, 5, 7, 9, 12)合金组织结构及耐腐蚀性能

郭耀威¹, 艾士民¹, 房大然¹^,², 林小娉¹^,²(

), 杨连威¹^,², 郑哲皓¹

1 东北大学材料科学与工程学院沈阳 110819
2 东北大学秦皇岛分校资源与材料学院秦皇岛 066004

Microstructure and Corrosion Resistance of High-pressure Solidified Mg-xAl (x = 3, 5, 7, 9, 12) Alloys

GUO Yaowei¹, AI Shimin¹, FANG Daran¹^,², LIN Xiaoping¹^,²(

), YANG Lianwei¹^,², ZHENG Zhehao¹

1 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
2 School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China

引用本文:

郭耀威, 艾士民, 房大然, 林小娉, 杨连威, 郑哲皓. 高压凝固Mg-xAl (x = 3, 5, 7, 9, 12)合金组织结构及耐腐蚀性能[J]. 中国腐蚀与防护学报, 2025, 45(5): 1265-1276.
Yaowei GUO, Shimin AI, Daran FANG, Xiaoping LIN, Lianwei YANG, Zhehao ZHENG. Microstructure and Corrosion Resistance of High-pressure Solidified Mg-xAl (x = 3, 5, 7, 9, 12) Alloys[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(5): 1265-1276.

全文: PDF(28398 KB) HTML

摘要:

利用CS-1V型六面顶高压设备重熔Mg-xAl (x = 3，5，7，9，12，质量分数，%)合金，采用SEM、XPS以及电化学实验等研究Mg-xAl合金组织结构及耐蚀性。结果表明，经4 GPa高压凝固后，Mg-Al合金的脱溶转变被抑制，共晶成分点及最大溶解度点右移，与常压凝固相比，高压凝固Mg-xAl合金最大基体固溶度增加0.38%~3.43%，β-Mg₁₇Al₁₂相含量降低0.1%~14.9%；且β-Mg₁₇Al₁₂相形貌和分布得到极大改善。因此，高压凝固Mg-xAl合金的电偶腐蚀倾向降低，耐腐蚀性能明显提升,其中Mg-5Al和Mg-9Al合金的耐蚀性最佳。

关键词 ： Mg-Al合金, 高压凝固, 组织结构, 耐蚀性

Abstract：

Mg-xAl (x = 3, 5, 7, 9, 12, mass fraction, %) alloys were prepared using both atmospheric pressure solidification and high-pressure solidification methods. The microstructure and corrosion resistance of the alloys were investigated using electrochemical tests, SEM and XPS. The results indicated that, after high pressure solidification at 4 GPa, the desolvation transition was inhibited for the alloy, and the eutectic composition point and maximum solubility point shifted to the right. Compared to atmospheric pressure solidification, the maximum matrix solid solubility of the high-pressure solidified Mg-Al alloys increased by 0.38%-3.43%, while the content of the eutectic β-Mg₁₇Al₁₂ phase decreased by 0.1%-14.9%. Furthermore, high pressure solidification could effectively improve the morphology and distribution of β-Mg₁₇Al₁₂. As a result, the propensity for galvanic coupling corrosion in the high-pressure solidified alloys decreased, and their corrosion resistance was significantly enhanced. Among the high-pressure solidified alloys with different Al contents, the Mg-5Al and Mg-9Al alloys exhibited the best corrosion resistance, which may be attributed to the better protective effect of their surface corrosion products on the substrate.

Key words： Mg-Al alloys high pressure solidification organization corrosion resistance

收稿日期: 2024-10-10 32134.14.1005.4537.2024.333

ZTFLH:

T146.2

基金资助:国家自然科学基金(51675092);河北省自然科学基金(E2022501001);河北省自然科学基金(E2022501006)

通讯作者: 林小娉，E-mail：lxping3588@163.com，研究方向为有色金属材料

Corresponding author: LIN Xiaoping, E-mail: lxping3588@163.com

作者简介: 郭耀威，男，2000年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.333 或 https://www.jcscp.org/CN/Y2025/V45/I5/1265

表1 Mg-xAl (x = 3，5，7，9，12，%)合金成分

图1 CS-1V型六面顶压机和高压凝固试样装配示意图

图2 Al含量对常规铸造Mg-Al合金显微组织的影响

图3 Al含量对Mg-Al合金中β-Mg17Al12相数量和基体中Al固溶量的影响

图4 Al含量对高压凝固Mg-xAl合金显微组织的影响

图5 高压凝固对Mg-xAl (x = 3，5，7，9，12) 合金腐蚀速率的影响

图6 Mg-xAl (x = 3，5，7，9，12)合金的极化曲线及Ecorr与Icorr随Al含量的变化

图7 常规铸造和高压凝固Mg-xAl (x = 3，5，7，9，12)合金的Nyquist图

图8 常规铸造与高压凝固Mg-xAl合金的Bode图

图9 不同凝固压力下高压凝固Mg-xAl (x = 3, 5, 7, 9,12)合金极化电阻Rp值

图10 常规铸造Mg-Al合金宏观腐蚀形貌

图11 高压凝固Mg-Al合金宏观腐蚀形貌

图12 常规铸造Mg-Al合金微观腐蚀形貌

图13 高压凝固Mg-Al合金在3.5%NaCl水溶液中浸泡2 h后的SEM腐蚀形貌

图14 常规铸造及高压凝固Mg-Al合金表面腐蚀形貌及横截面SEM像和EDS元素面扫描

图15 常规铸造及高压凝固Mg-xAl合金在3.5%NaCl溶液中浸泡24 h的XPS光谱

表2 高压凝固Mg-xAl (x = 5, 9)合金表面化学成分 (atomic fraction / %)

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