| 黎良成,孔小东,李曦.5083铝合金在3%NaCl溶液中的微区电化学特性[J].装备环境工程,2016,13(4):8-14. LI Liang-cheng,KONG Xiao-dong,LI Xi.Electrochemical Properties of Micro Area of 5083 Aluminum Alloy in 3%NaCl Solution[J].Equipment Environmental Engineering,2016,13(4):8-14. |
| 5083铝合金在3%NaCl溶液中的微区电化学特性 |
| Electrochemical Properties of Micro Area of 5083 Aluminum Alloy in 3%NaCl Solution |
| 投稿时间：2016-05-26 修订日期：2016-08-15 |
| DOI：10.7643/ issn.1672-9242.2016.04.002 |
| 中文关键词: 5083铝合金 SVET 腐蚀 发生机理 |
| 英文关键词:5083 aluminum alloy SVET Corrosion Occurrence mechanism |
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| 中文摘要: |
| 目的 对5083铝合金在海水环境下的腐蚀行为进行深入的探索。方法 在3%NaCl溶液条件下，通过扫描振动电极技术(SVET)对5083铝合金的微小区域进行了原位测量，得到表面区域电位梯度的变化情况，结合交流阻抗测试，以及扫描电镜和能谱分析等方法，研究5083铝合金腐蚀的发生、发展机理。结果 由于Zn和S等元素的偏析，腐蚀过程中，夹杂物等第二相周围优先溶解，致使铝合金基体裸露在溶液中。随着反应的持续形成点蚀，腐蚀电流使腐蚀区域的电位高于基体电位。浸泡3 h，最大电位差为15.72 mV，浸泡5 h，最大电位差达到20.06 mV。结论 5083铝合金在海水环境下夹杂物的周围优先溶解，然后是电位高于基体电位的第二相发生溶解，同时钝化膜破裂处也发生腐蚀，最终这些区域形成点蚀。 |
| 英文摘要: |
| Objective To further explore the corrosion behavior of 5083 aluminum alloy in seawater environment. Methods Under the condition of 3%NaCl solution, we measured the micro region of 5083 aluminum alloy by scanning vibrating electrode technique (SVET), obtained the change of potential gradient in the surface area, and studied the occurrence and development mechanism of corrosion of 5083 aluminum alloy by combining AC impedance spectroscopy, Scanning electron microscopy and energy spectrum analysis. Results The results showed that due to the segregation of elements such as Zn and S in the process of corrosion, the surrounding area of the second phase including inclusions was dissolved first, which caused the aluminum alloy matrix to be exposed in the solution, and formed pitting when the reaction continued, and corrosion current led to higher potential of the corrosion area than that of the matrix. When soaked for 3 h, the maximum potential difference was 15.72 mV, and when soaked for 5 h, the maximum potential difference reached 20.06 mV. Conclusion In seawater environment, the surrounding area of the inclusion of 5083 aluminum alloy was dissolved with priority, followed by the second phase with higher potential than the matrix potential, at the same time, the area with damaged passivation film was also corroded, and finally these areas formed pitting. |
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