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热挤压态SiC_p/AZ91镁基复合材料腐蚀行为研究
Corrosion Behavior of a Hot Extruded Magnesium Alloy AZ91 Based Composite SiC_p/AZ91

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张春艳 1 *   张涛 2   邵亚薇 2   孟国哲 2  
文摘 利用腐蚀失重和电化学测试方法,并结合SEM和TEM分析技术,研究增强相SiC 颗粒的体积分数为2%,5%,10%和15%的SiC_p/AZ91镁基复合材料(MMCs),在25 ℃条件下,含有饱和Mg(OH)2的3.5%NaCl 溶液中的腐蚀行为。结果表明,SiC_p/AZ91MMCs的腐蚀速率明显大于AZ91镁合金,并且随SiC 颗粒体积分数的增加而增大。SiC颗粒不与AZ91基体直接构成微电偶,但是SiC 颗粒的加入改变了SiC_p/AZ91 MMCs的显微结构从而提高了腐蚀速率。主要原因为随着SiC 颗粒的加入β相晶粒细化,使β相与α相间的微电偶腐蚀电流密度增大;SiC 颗粒的加入使大量的β相在SiC 颗粒与AZ91基体界面处优先再结晶,致使该界面处β相与α相间的微电偶腐蚀加速,间接导致SiC_p/AZ91 MMCs的腐蚀加速。
其他语种文摘 The corrosion behavior of the hot- extruded SiC_p/AZ91 (MMCs), a magnesium alloy AZ91 based composite containing different amount SiC particles (i.e. 2%, 5%, 10% and 20% in volume fraction), was investigated in 3.5%NaCl solution saturated by Mg(OH)2 at 25 ℃ by means of mass loss method, electrochemical measurements, SEM and TEM observations and XRD. The results indicated that: The corrosion rate of the SiC_p/AZ91 MMCs was much greater than that of AZ91 magnesium alloy, and which increased as the increasing volume fraction of micron- sized SiC. The strengthening SiC particles exhibited little tendency with the alloy matrix to form galvanic couple, thereby little tendency to induce galvanic corrosion in micro-scale. But the addition of SiC particles resulted in a highly change in microstructure of SiC_p/AZ91 MMCs, as consequence, the corrosion resistance of the composite became significant inferior, in comparison with those of the AZ91 alloy. There were two main reasons responsible for the greater corrosion rate of SiC_p/ AZ91 MMCs. Firstly, SiC particles promoted grain refinement of β phase, which increased the micro-galvanic corrosion current density between β phase and α phase. Secondly, the addition of SiC particles promoted the dynamic recrystallization nucleation of β phase at the interface SiC particles/ AZ91 matrix, which might be beneficial to the microgalvanic corrosion of the coupling of β phase and α phase there, therewith indirectly increased the corrosion rate of SiC_p/AZ91 MMCs.
来源 腐蚀科学与防护技术 ,2014,26(2):99-112 【核心库】
关键词 SiC_p/AZ91 MMCs ; 微电偶腐蚀 ; 微观结构
地址

1. 哈尔滨工程大学材料科学与化学工程学院腐蚀与防护实验室, 哈尔滨, 150001  

2. 哈尔滨工程大学材料科学与化学工程学院腐蚀与防护实验室, 金属腐蚀与防护国家重点实验室, 哈尔滨, 150001

语种 中文
文献类型 研究性论文
ISSN 1002-6495
学科 金属学与金属工艺
文献收藏号 CSCD:5094859

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引证文献 2

1 冯艳 镁基复合材料的研究进展 中国有色金属学报,2017,27(12):2385-2407
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2 吕鑫 SiC_p尺寸对铸态AZ91镁合金显微组织与腐蚀性能的影响 中国腐蚀与防护学报,2023,43(1):135-142
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