| 冷却速度对Zn--5 Al--0.1 RE--x Si合金显微组织及耐蚀性能的影响 |
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| 作者姓名： | 涂浩 魏大圣 周圣洁 刘亚 吴长军 苏旭平 王建华 |
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| 作者单位： | 常州大学材料科学与工程学院，常州213164;常州大学江苏省材料表面科学与技术重点实验室，常州213164;常州大学材料科学与工程学院，常州213164;常州大学江苏省材料表面科学与技术重点实验室，常州213164;常州大学江苏省光伏科学与工程协同创新中心，常州213164 |
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| 基金项目： | 国家自然科学基金资助项目(51271040，51201023) |
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| 摘 要： | 运用扫描电子显微镜/能谱仪、X射线衍射、盐雾实验、电极化曲线等手段,研究冷却速度和Si对Zn-5Al-0.1RE合金组织及耐蚀性能的影响.结果表明,Zn-5Al-0.1RE-xSi合金由先析出的η-Zn和η-Zn+α-Al共晶组织组成,前者均匀分布在相邻的η-Zn+α-Al共晶胞的边界上.降低冷却速度和Si的加入,均使Zn-5Al-0.1RE-xSi合金单位面积的晶粒增大,晶界减少,合金耐蚀性能提高.Zn-5Al-0.1RE-xSi合金耐蚀性能的差异与合金凝固组织及合金腐蚀产物中Zn5(OH)8Cl2·H2O和ZnO的相对量有关.
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| 关 键 词： | 锌铝合金 冷却速度 微观结构 耐蚀性能 硅 热浸镀锌 |
| 收稿时间： | 2016-03-09 |
Effect of cooling rate on the microstructure and corrosion properties of Zn-5Al-0.1RE-xSi alloys |
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| Affiliation: | 1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China;3. Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou 213164, China |
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| Abstract: | The effects of cooling rate and Si on the microstructure and corrosion property of the Zn-5Al-0.1 RE alloy were studied by scanning electron microscopy-energy dispersive spectrometry, X-ray diffraction, neutral salt spray test and polarization curves. The results show that Zn-5Al-0.1RE-xSi alloys are composed of primary η-Zn phase and η-Zn + α-Al eutectic structure, and the former is uniformly distributed on the adjacent η-Zn + α-Al entectic cells. The reduction of cooling rate and the addition of Si make the grain size increase and the boundary area per unit alloy area decrease; at the same time, the corrosion resistance is improved. The corrosion resistance of the Zn-5Al-0.1 RE-xSi alloys is dependent on their solidification structure and the relative amount of corrosion products including Zn5(OH)8Cl2·H20 and ZnO. |
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