| 引用本文: | 杨明军1,林 翰1,杨明波2,邵 军1,谢 懿1,何绍付1,马仕达3,李翔光1.ZM6 铸造镁合金表面斑点缺陷形成机理分析(J/M/D/N,J:杂志，M：书，D：论文，N：报纸).期刊名称,2024，41（3）：51-57 |
| CHEN X. Adap tive slidingmode contr ol for discrete2ti me multi2inputmulti2 out put systems[ J ]. Aut omatica, 2006, 42(6): 4272-435 |
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| ZM6 铸造镁合金表面斑点缺陷形成机理分析 |
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杨明军1,林 翰1,杨明波2,邵 军1,谢 懿1,何绍付1,马仕达3,李翔光1
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1. 贵州航天风华精密设备有限公司,贵阳 550000
2. 重庆理工大学 材料科学与工程学院,重庆 400050
3. 中国兵器工业第五九研究所,重庆 400044
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| 摘要: |
| 目的 为探究 ZM6 铸造镁合金表面斑点缺陷产生的原因及其形成机理。 方法 通过扫描电子显微镜( SEM)
对未经机加工和经机加工后的 ZM6 铸造镁合金表面不同形态的斑点缺陷进行形貌分析,并结合能量色散 X 射线
谱(EDS)对斑点缺陷的化学成分进行检测,最后耦合合金铸态组织和力学性能进行综合分析。 结果 未经机加工的
ZM6 铸造镁合金表面斑点缺陷呈深黑色,而经机加工后的 ZM6 铸造镁合金表面斑点缺陷呈白色,且部分白色斑点
中心有一小块黑色区域。 不过未经机加工和经机加工后的 ZM6 铸造镁合金表面斑点缺陷都呈现龟裂状、其与基
体的过渡界面处均未发现任何空隙存在,且其主要成分均为 Mg 的氧化物或氢氧化物、同时含有 Cl、K 等由溶剂引
入的杂质元素,但未经机加工的 ZM6 铸造镁合金表面斑点缺陷中 Cl 元素的含量相对较高,而经机加工后的 ZM6
铸造镁合金表面斑点缺陷中 K 元素的含量相对较高。 值得指出的是,经机加工后的 ZM6 铸造镁合金表面白色斑
点中黑色区域存在微小气孔。 结论 ZM6 铸造镁合金表面斑点缺陷的产生是由 Mg 的化学腐蚀及电偶腐蚀造成的,
而不是由氧化夹杂造成的。 因此,通过加强 ZM6 铸造镁合金精炼效果以获得化学成分均匀的熔体是获得高质量
构件的有效途径。 |
| 关键词: 砂型铸造 氧化夹杂 斑点微结构 氧化反应 电偶腐蚀 |
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| Formation Mechanism of Spot Defects on the Surface of ZM6 Magnesium Alloy |
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YANG Mingjun1,LIN Han1,YANG Mingbo2, SHAO Jun1,XIE Yi
1,HE Shaofu1,MA Shida3,LI Xiangguang1
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1. Guizhou Aerospace Fenghua Precision Equipment Co. Ltd. Guiyang 550000 China
2. College of Materials Science and Engineering Chongqing University of Technology Chongqing 400050 China
3. The 59th Research Institute of China Ordnance Industries Chongqing 400044 China
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| Abstract: |
| Objective This paper aims to explore the causes and formation mechanism of spot defects on the surface of
ZM6 magnesium alloy. Methods Spot defects with different morphologies on the surfaces of unmachined and machined
ZM6 magnesium alloys were analyzed by scanning electron microscopy SEM . Simultaneously the chemical compositions
of these spot defects were identified by energy dispersive X-ray spectroscopy EDS . Finally a comprehensive analysis
was carried out combining the as-cast microstructure and mechanical properties of the alloy. Results The results showed that spot defects on the surface of the unmachined ZM6 magnesium alloy were deep black while the spot defects on the
surface of the machined ZM6 magnesium alloy were white and there was a small black area in the center of some white
spots. The spot defects on the surfaces of both unmachined and machined ZM6 magnesium alloys were cracked and no
voids were found at the transition interface with the substrate. The main components were oxides or hydroxides of Mg
while also containing impurity elements such as Cl and K introduced by the solvent. The content of the Cl element was
relatively high in the surface spot defects of unmachined ZM6 Mg alloy while the content of the K element was relatively
low in the surface spot defects of machined ZM6 Mg alloy. It?? s worth noting that there were tiny pores in the black area of
the white spots on the surface of the machined ZM6 magnesium alloy. Conclusions It can be concluded that the spot
defects on the surface of ZM6 magnesium alloy are caused by chemical and galvanic corrosion of Mg rather than by
oxidation inclusions. Therefore strengthening the refining effect of ZM6 casting magnesium alloy to obtain a melt with
uniform chemical composition is an effective way to obtain high-quality components. |
| Key words: sand casting oxidation inclusions microstructure of spots oxidation reaction galvanic corrosion |
