| Localized corrosion mechanism associated with precipitates containing Mg in Al alloys |
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| 引用本文： | 任文达 李劲风 郑子樵 陈文敬. Localized corrosion mechanism associated with precipitates containing Mg in Al alloys[J]. 中国有色金属学会会刊, 2007, 17(4): 727-732. DOI: 10.1016/S1003-6326(07)60164-2 |
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| 作者姓名： | 任文达 李劲风 郑子樵 陈文敬 |
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| 作者单位： | [1]School of Materials Science and Engineering, Central South University, Changsha 410083, China [2]The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China |
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| 摘 要： | To clarify the localized corrosion mechanism associated with precipitates containing Mg in Al alloys, the simulated bulk precipitates of S and β were synthesized through melting and casting. Their electrochemical behaviors and coupling behaviors with α（Al） in NaCl solution were measured. Meanwhile, simulated Al alloys containing S and β particles were prepared and their corrosion morphologies were observed. It＇s found that there exist two kinds of corrosion mechanisms associated with precipitates containing Mg. The precipitate of β is anodic to the alloy base, resulting in its anodic dissolution and corrosion during the whole corrosion process. While, there exists a corrosion conversion mechanism associated with the S precipitate, which contains active element Mg and noble element Cu simultaneously. At an initial stage, S is anodic to the alloy matrix at its periphery and the corrosion occurs on its surface. However, during its corrosion process, Mg is preferentially dissolved and noble Cu is enriched in the remnants. This makes S become cathodic to a（Al） and leads to anodic dissolution and corrosion on the alloy base at its periphery at a later stage.
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| 关 键 词： | 局部腐蚀 铝合金 镁掺杂 腐蚀机制 |
| 收稿时间： | 2006-09-30 |
| 修稿时间： | 2006-09-302006-12-08 |
Localized corrosion mechanism associated with precipitates containing Mg in Al alloys |
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| REN Wen-da,LI Jin-feng,ZHENG Zi-qiao,CHEN Wen-jing. Localized corrosion mechanism associated with precipitates containing Mg in Al alloys[J]. Transactions of Nonferrous Metals Society of China, 2007, 17(4): 727-732. DOI: 10.1016/S1003-6326(07)60164-2 |
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| Authors: | REN Wen-da LI Jin-feng ZHENG Zi-qiao CHEN Wen-jing |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China ;2. The Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China |
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| Abstract: | To clarify the localized corrosion mechanism associated with precipitates containing Mg in Al alloys, the simulated bulk precipitates of S and β were synthesized through melting and casting. Their electrochemical behaviors and coupling behaviors with α(Al) in NaCl solution were measured. Meanwhile, simulated Al alloys containing S and β particles were prepared and their corrosion morphologies were observed. It's found that there exist two kinds of corrosion mechanisms associated with precipitates containing Mg. The precipitate of β is anodic to the alloy base, resulting in its anodic dissolution and corrosion during the whole corrosion process. While, there exists a corrosion conversion mechanism associated with the S precipitate, which contains active element Mg and noble element Cu simultaneously. At an initial stage, S is anodic to the alloy matrix at its periphery and the corrosion occurs on its surface. However, during its corrosion process, Mg is preferentially dissolved and noble Cu is enriched in the remnants. This makes S become cathodic to α(Al) and leads to anodic dissolution and corrosion on the alloy base at its periphery at a later stage. |
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| Keywords: | localized corrosion mechanism Mg-containing precipitate Al alloy |
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