| Microstructure and corrosion mechanism of as-cast Mg-Zn-Mn-Ca in Hank’s solution |
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| 引用本文： | ZHOU Hong,WANG Yong,LIAO Zhi-dong. Microstructure and corrosion mechanism of as-cast Mg-Zn-Mn-Ca in Hank’s solution[J]. 重庆大学学报(英文版), 2010, 9(3): 146-150 |
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| 作者姓名： | ZHOU Hong WANG Yong LIAO Zhi-dong |
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| 作者单位： | College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China;College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China;College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China |
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| 摘 要： | An Mg-Zn-Mn-Ca alloy with high Zn content was fabricated by vacuum melting. The as-cast microstructure was investigated using XRD, SEM and EDS. It was shown that the alloy was composed of α-Mg, strip-like Ca2Mg6Zn3 and a few Mn- containing phases. Most of the Ca2Mg6Zn3 phase was distributed at grain boundaries while Mn-containing particles were deposited within grains. The as-cast samples were immersed in a Hank＇s balanced salt solution （HBSS） up to 24 h. The corroded surface morphology and cross-section microstructure were analyzed after different time of immersion so as to understand the corrosion behavior of the alloy. During immersion in the HBSS, the alloy corroded homogeneously at the very beginning and then localized corrosion occurred. The secondary phases protruded on the surface due to the dissolution of α-Mg, suggesting micro- galvanic corrosion occurred with secondary phases acting as the cathode and ct-Mg as the anode. Micro-cracks were formed at the interfaces between Ca2Mg6Zn3 and α-Mg, indicating an undermining tendency of the secondary phases.
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| 关 键 词： | magnesium alloy microstructure crystal structure Hank＇s balanced salt solution corrosion |
Microstructure and corrosion mechanism of as-cast Mg-Zn-Mn-Ca in Hank's solution |
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| ZHOU Hong,WANG Yong and LIAO Zhi-dong. Microstructure and corrosion mechanism of as-cast Mg-Zn-Mn-Ca in Hank's solution[J]. Journal of Chongqing University(English Edition), 2010, 9(3): 146-150 |
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| Authors: | ZHOU Hong WANG Yong LIAO Zhi-dong |
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| Affiliation: | College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China;College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China;College of Materials Science & Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400045, P. R. China |
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| Abstract: | An Mg-Zn-Mn-Ca alloy with high Zn content was fabricated by vacuum melting. The as-cast microstructure was investigated using XRD, SEM and EDS. It was shown that the alloy was composed of α-Mg, strip-like Ca2Mg6Zn3 and a few Mn-containing phases. Most of the Ca2Mg6Zn3 phase was distributed at grain boundaries while Mn-containing particles were deposited within grains. The as-cast samples were immersed in a Hank's balanced salt solution (HBSS) up to 24 h. The corroded surface morphology and cross-section microstructure were analyzed after different time of immersion so as to understand the corrosion behavior of the alloy. During immersion in the HBSS, the alloy corroded homogeneously at the very beginning and then localized corrosion occurred. The secondary phases protruded on the surface due to the dissolution of α-Mg, suggesting micro-galvanic corrosion occurred with secondary phases acting as the cathode and α-Mg as the anode. Micro-cracks were formed at the interfaces between Ca2Mg6Zn3 and α-Mg, indicating an undermining tendency of the secondary phases. |
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| Keywords: | magnesium alloy microstructure crystal structure Hank's balanced salt solution corrosion |
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