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中国腐蚀与防护学报  2016, Vol. 36 Issue (2): 143-149    DOI: 10.11902/1005.4537.2015.040
  本期目录 | 过刊浏览 |
热处理对Mg-10Gd-2.5Nd-0.5Zr合金组织和耐蚀性能的影响
马旭1,2,李全安1,2,3(),井晓天1
1. 西安理工大学材料科学与工程学院 西安 710048
2. 河南科技大学材料科学与工程学院 洛阳 471023
3. 河南科技大学 有色金属共性技术河南省协同创新中心 洛阳 471023
Influence of Heat Treatment on Microstructure and Corrosion Resistance of Mg-10Gd-2.5Nd-0.5Zr Alloy
Xu MA1,2,Quan'an LI1,2,3(),Xiaotian JING1
1. College of Materials Science and Technology, Xi'an University of Technology, Xi'an 710048, China
2. College of Materials Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
3. Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Luoyang 471023, China
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摘要: 

通过OM,XRD,TEM和SEM等手段研究了热处理前后Mg-10Gd-2.5Nd-0.5Zr (质量分数,%) 合金的显微组织形貌,并在3.5% (质量分数)NaCl溶液中进行了0~96 h的失重腐蚀实验。结果表明:合金铸态组织由α-Mg基体和粗大的枝晶β相组成,热处理后,合金中的β相经溶解再析出过程,由断续网状转变为方块颗粒状;在3.5%NaCl溶液中,经热处理后,合金的耐蚀性能明显提高,其平均腐蚀速率由铸态时的0.74 mgcm-2d-1,降低到固溶态时的0.41 mgcm-2d-1和时效态时的0.35 mgcm-2d-1,且腐蚀产物以Mg(OH)2为主。

关键词 热处理Mg-10Gd-2.5Nd-0.5Zr合金显微组织耐蚀性能    
Abstract

The microstructure of Mg-10Gd-2.5Nd-0.5Zr (mass fraction, %) alloy after solid solution and aging treatment were characterized by means of OM, XRD, TEM and SEM. The average corrosion rate in 3.5% (mass fraction) NaCl solution was measured for 0~96 h. The results show that the microstructure of the as-cast alloy is composed of α-Mg matrix and coarse dentritic crystal β phase. After heat treatment, the β phase has experienced a course of dissolution and then precipitation, while the discontinued net-like β-phase transformed into cuboid-shaped particles due to the solution and aging treatment. The heat treatments are beneficial to the corrosion resistant of the alloy in 3.5%NaCl solution, while its corrosion rate was 0.74 mgcm-2d-1 for the as-cast, 0.41 mgcm-2d-1 for the solid solution treated and 0.35 mgcm-2d-1 for the aging treated ones respectively. The corrosion products of the alloy is mainly composed of Mg(OH)2.

Key wordsheat treatment    Mg-10Gd-2.5Nd-0.5Zr alloy    microstructure    corrosion resistance
    
基金资助:国家自然科学基金项目 (51171059) 和河南省基础与前沿技术研究计划项目 (102300410018) 资助

引用本文:

马旭,李全安,井晓天. 热处理对Mg-10Gd-2.5Nd-0.5Zr合金组织和耐蚀性能的影响[J]. 中国腐蚀与防护学报, 2016, 36(2): 143-149.
Xu MA, Quan'an LI, Xiaotian JING. Influence of Heat Treatment on Microstructure and Corrosion Resistance of Mg-10Gd-2.5Nd-0.5Zr Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 143-149.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.040      或      https://www.jcscp.org/CN/Y2016/V36/I2/143

图1  Mg-10Gd-2.5Nd-0.5Zr合金热处理前后的显微组织
图2  Mg-10Gd-2.5Nd-0.5Zr合金热处理前后的SEM像
图3  Mg-10Gd-2.5Nd-0.5Zr合金热处理前后的TEM像
图4  铸态、固溶态和时效态Mg-10Gd-2.5Nd-0.5Zr合金的腐蚀速率随时间的变化曲线
图5  Mg-10Gd-2.5Nd-0.5Zr合金腐蚀48 h后的宏观腐蚀形貌
图6  Mg-10Gd-2.5Nd-0.5Zr合金腐蚀48 h后的表面形貌
图7  Mg-10Gd-2.5Nd-0.5Zr合金表面腐蚀产物的XRD谱
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