| Mg-1Mn-1Zn镁合金的组织与腐蚀行为研究 |
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| 引用本文： | 张忠明,张俊,马莹,王婷,徐春杰. Mg-1Mn-1Zn镁合金的组织与腐蚀行为研究[J]. 铸造技术, 2012, 33(3): 257-260 |
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| 作者姓名： | 张忠明 张俊 马莹 王婷 徐春杰 |
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| 作者单位： | 1. 西安理工大学材料科学与工程学院,陕西省腐蚀与防护重点实验室,陕西西安710048
2. 西安理工大学材料科学与工程学院,陕西省腐蚀与防护重点实验室,陕西西安710048;西安航空技术高等专科学校机械工程系,陕西西安710077 |
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| 基金项目： | 陕西省科技计划资助项目(2010K10-08);陕西省教育厅科学研究计划资助项目(2010JK769,2010JK764);陕西省重点学科建设专项资金资助项目(陕财办教2008-171) |
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| 摘 要： | 采用金属型铸造制备Mg-1Mn-1Zn(wt％)三元合金,并将其挤压成棒材.利用光学显微镜、扫描电子显微镜、浸泡试验法等研究了Mg-1Mn-Zn合金的微观组织及其在0.9％NaCl溶液中的腐蚀行为.结果表明,Mg-1Mn-1Zn合金室温组织由树枝状的α-Mg相、非平衡共晶MgZn化合物相和脱溶析出的α-Mn相构成.热挤压使等轴晶粒沿挤压方向被拉长,呈现纤维状组织.Mg-1Mn-1Zn合金的平均腐蚀速率随时间增加逐渐降低.经过264 h浸泡后,挤压态Mg-1Mn-1Zn合金的平均腐蚀速率为0.44 mm/a,比铸态合金的低26.7％.
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| 关 键 词： | Mg合金 正挤压 微观组织 腐蚀 |
Study on Microstructure and Corrosion Behavior of Mg-1Mn-1Zn Magnesium Alloy |
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| ZHANG Zhong-ming , ZHANG Jun , MA Ying , WANG Ting , XU Chun-jie. Study on Microstructure and Corrosion Behavior of Mg-1Mn-1Zn Magnesium Alloy[J]. Foundry Technology, 2012, 33(3): 257-260 |
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| Authors: | ZHANG Zhong-ming ZHANG Jun MA Ying WANG Ting XU Chun-jie |
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| Affiliation: | 1(1.School of Materials Science and Engineering,Key Laboratory for Corrosion and Protection of Shaanxi Province,Xi’an University of Technology,Xi’an 710048,China;2.Department of Mechanical Engineering,Xi’an Aerotechnical College,Xi’an 710077,China) |
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| Abstract: | The Mg-1Mn-1Zn(wt%) ternary magnesium alloy ingot was prepared by permanent mold casting,and subsequently was extruded into rod.The microstructure of the alloy was observed by optical microscope and scanning electron microscopy.The corrosion behavior of the alloy in 0.9% sodium chloride solution was investigated by immersion corrosion test in laboratory.The results show that the Mg-1Mn-1Zn alloy is composed of dendritic α-Mg solid solution,non-equilibrium eutectic phase MgZn and precipitated phase α-Mn.The as-cast equiaxed grains are elongated by hot extrusion,and fibrous grains appear along the extrusion direction.The mean corrosion rate of the alloy decreases as immersion time increases.After 264 h immersion test,the mean corrosion rate of extruded Mg-1Mn-1Zn alloy is 0.44 mm/a,which is 26.7% slower than that of as-cast alloy. |
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| Keywords: | magnesium alloy extrusion microstructure corrosion |
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