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热处理对铸态Mg-xGd-yNd（x+y=6）合金腐蚀行为的影响

秦庆伟#，成思婷#，吕赵鹏，朱子义，刘 振，马鸿斌*，彭 勇*
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2025年 第44卷 第2期: 1000-6281（2025）02-170-12     下载地址：

热处理对铸态Mg-xGd-yNd（x+y=6）合金腐蚀行为的影响

秦庆伟#，成思婷#，吕赵鹏，朱子义，刘 振，马鸿斌*，彭 勇*

(1.青海大学 高性能轻金属合金与成形工程研究中心，青海省新型轻合金重点实验室，青海大学盐湖化工大型系列研究设施，青海省盐湖化工材料重点实验室，青海 西宁 810016；2.兰州大学 电镜中心，甘肃 兰州 730000)

摘 要 Mg-Gd系合金作为一种性能优异的轻质镁合金，因其高强度而备受关注。为进一步满足材料轻量化的需求，用轻稀土元素Nd替代Mg-Gd系合金中部分Gd元素是一种有效途径。Nd元素含量的变化以及热处理都对合金的腐蚀行为有着显著的影响。本文详细研究了Nd元素含量变化和热处理对合金微观组织以及腐蚀产物膜的影响。研究结果表明：Nd元素的添加使得合金内部析出相转变为Mg-Gd-Nd化合物，并促进形成了Mg41Nd5相。Nd元素含量变化会导致合金腐蚀产物Mg(OH)2的形貌发生改变。当合金中Nd含量达到4%时，合金表面层片状Mg(OH)2转变为块状Mg(OH)2，腐蚀产物膜的致密性得到进一步提升。在540 ℃热处理条件下，合金内部Mg3(Gd，Nd)相和Mg41Nd5相的分解使得合金的耐腐蚀性能显著提升。

关键词 镁合金；Nd元素；微观组织；腐蚀产物膜；热处理

中图分类号： TG178；TB31；TG115.21+5.3 文献标识码：A Doi:10.3969/j.issn.1000-6281.2025.02.004

 

Effect of heat treatment on the corrosion behavior of as-cast Mg-xGd-yNd (x+y=6) alloys

QIN Qingwei#，CHENG Siting#，LV Zhaopeng，ZHU Ziyi，LIU Zhen， MA Hongbin*，PENG Yong*

(1. Qinghai Provincial Key Laboratory of New Light Alloys, Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and Forming. Salt Lake Chemical Engineering Research Complex, Qinghai University，Key Laboratory of Salt Lake Chemical Material of Qinghai Province, Qinghai University, Xining Qinghai 810016； 2. Electron Microscopy Center, Lanzhou University, Lanzhou Gansu 730000, China)

Abstract Mg-Gd system alloys, known for their excellent properties as lightweight materials, have attracted significant attention due to their high strength. To further meet the demand for lightweight materials, replacing part of the Gd elements with the light rare earth element Nd offers an effective approach. The variation in Nd element content and heat treatment significantly impacts the corrosion behavior of the alloy. This paper provides a detailed study on how changes in Nd content and heat treatment affect the microstructure of the alloy and its corrosion product film. The results indicate that the addition of Nd transforms the internal precipitates into Mg-Gd-Nd compounds and promotes the formation of Mg41Nd5 phase. The variation of Nd content influence the morphology of the corrosion product of Mg(OH)2. When the Nd content reaches 4%, the surface lamellar Mg(OH)2 transforms into tetrahedral Mg(OH)2, and thereby increasing the density of the corrosion product film. Under heat treatment condition at 540 ℃, the decomposition of Mg3(Gd, Nd) phase and Mg41Nd5 phase significantly improves the alloy’s corrosion resistance.

Keywords magnesium alloy; Nd element; microstructure; corrosion product film; heat treatment