| LC4CS铝合金裂纹尖端腐蚀行为的实验研究 |
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| 引用本文： | 何建平,陈文理,樊蔚勋.LC4CS铝合金裂纹尖端腐蚀行为的实验研究[J].南京航空航天大学学报,2000,32(3):288-293. |
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| 作者姓名： | 何建平 陈文理 樊蔚勋 |
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| 作者单位： | 1. 南京航空航天大学材料科学与工程系,南京,210016
2. 海南航空股份有限公司,海口,570203 |
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| 摘 要： | ＬＣ４ＣＳ铝合金是极为重要的航空材料，为评定其使用年限，在测定铝合金腐蚀疲劳裂纹的扩展速率时，需要弄清纹尖端金属的腐蚀电化学行为。在腐蚀环境中裂纹尖端由于不断露新鲜金属，因而将具有类似于双金属腐蚀时的电偶效应。为此，文中设计了一种新颖的缺口试样，再现裂纹尖端的真实状态，并在３．５％ＮａＣｌ溶液测定剪切口断裂后，裸露出的新鲜金属在耦合前后腐蚀电位的变化，以及裸露面积，ＮａＣｌ溶液的ｐＨ值与电偶电流的
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| 关 键 词： | 裂纹尖端 腐蚀速率 耦合电流 缺口试样 铝合金 |
Experiment on Aluminium Alloy LC4CS Corrosion at Crack Tip |
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| He Jianping,Chen Wenli,Fan Weixun.Experiment on Aluminium Alloy LC4CS Corrosion at Crack Tip[J].Journal of Nanjing University of Aeronautics & Astronautics,2000,32(3):288-293. |
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| Authors: | He Jianping Chen Wenli Fan Weixun |
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| Abstract: | A notched specimen is designed to simulate the corrosion reaction at crack tip. The corrosion potential of fresh surface for the broken notched specimen is measured with and without couple action in 3.5%NaCl aqueous solution, and the relation of the fresh area couple and pH couple currents obtained. In pH=3.5 aqueous solution, the effect of corrosion current on couple current is analyzed to acquire the variation of the corrosion rate to time at couple action while the fresh area of the broken notched specimen is changed. |
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| Keywords: | crack tip corrosion rate couple current notched specimen |
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