航空Al-Cu-Mg合金剝落腐蝕行為

楊勝; 易丹青; 鐘利; 姚素娟; 劉會群

doi:10.13374/j.issn1001-053x.2007.02.049

航空Al-Cu-Mg合金剝落腐蝕行為

doi: 10.13374/j.issn1001-053x.2007.02.049

1. 中南大學材料科學與工程學院, 長沙 410083;
2. 東北輕合金有限公司, 哈爾濱 115001;
3. 中鋁公司鄭州研究院, 鄭州 450041

基金項目:

國家“973”重點基礎研究發展規劃項目(No.2005CB623705)

詳細信息

作者簡介:
楊勝(1975-),男,博士研究生;易丹青(1954-),男,教授,博士生導師

中圖分類號: TG174.36
計量
- 文章訪問數: 134
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- 被引次數: 0
出版歷程
- 收稿日期: 2006-09-28
- 修回日期: 2006-12-12
- 網絡出版日期: 2021-08-16

Exfoliation corrosion behavior of Al-Cu-Mg alloys for aerospace applications

1. Materials Science and Engineering School, Central South University, Changsha 410083, China;
2. Northeast Light Alloy Incorporated Company, Harbin 115001, China;
3. Zhengzhou Research Institute of Chalco, Zhengzhou 450041, China

摘要

摘要: 采用TEM、電化學等分析方法和手段,對在剝落腐蝕溶液中浸泡不同時間的Al-Cu-Mg合金的剝蝕敏感性及電化學阻抗(EIS)進行研究,分析剝落腐蝕的動力學過程.實驗結果表明,2524-T4態合金具有良好的耐剝落腐蝕性能,高Cu含量的第二相粒子是影響合金剝蝕行為的主要因素,合金浸泡2d后才可見明顯的點蝕,浸泡4d后局部出現剝蝕現象.根據EIS及EIS等效電路的擬合分析合金的剝蝕行為,發現其動力學過程主要由點蝕的誘導形成、點蝕發展及輕微的剝蝕形成三個階段組成,而腐蝕的界面反應依次經歷氧化膜的溶解、表面腐蝕產物的形成、吸附及脫落的一系列過程.
- 鋁合金 /
- 剝落腐蝕 /
- 電化學阻抗 /
- 等效電路
Abstract: The exfoliation corrosion susceptibility and electrochemical impedance spectroscopy (EIS) of Al-Cu-Mg alloys with different corrosive grades were studied to analyze the dynamic process of exfoliation corrosion by TEM and electrochemical. The results show that 2524-T4 aluminum alloy is good in exfoliation corrosion property, Cu-rich particles are the main influence factor of exfoliation corrosion behavior of the alloy, pitting corrosion occurs after 2d and light exfoliation corrosion can be found after 4d. Using EIS and equivalent circuit to analyze the corrosion dynamic process, the corrosion process includes formation of pitting corrosion, development of pitting corrosion, and formation of exfoliation corrosion. The interface reaction in the corrosion process contains dissolution of oxide film, formation, adsorption and exfoliation of surface corrosion products.
- aluminum alloy /
- exfoliation corrosion /
- EIS /
- equivalent circuit