微弧氧化對7050鋁合金腐蝕行為的影響

莊俊杰; 張曉燕; 孫斌; 宋仁國; 李海

doi:10.13374/j.issn2095-9389.2017.10.011

微弧氧化對7050鋁合金腐蝕行為的影響

doi: 10.13374/j.issn2095-9389.2017.10.011

莊俊杰^1,2,
張曉燕^1,2,
孫斌^1,2,
宋仁國^1,2, ,,
李海^1,2

1) 常州大學材料科學與工程學院, 常州 213164
2) 常州大學江蘇省材料表面科學與技術重點實驗室, 常州 213164

基金項目:

國家自然科學基金資助項目(51371039)

詳細信息

中圖分類號: TG171
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- 被引次數: 0
出版歷程
- 收稿日期: 2016-11-17

Microarc oxidation coatings and corrosion behavior of 7050 aluminum alloy

ZHUANG Jun-jie^1,2,
ZHANG Xiao-yan^1,2,
SUN Bin^1,2,
SONG Ren-guo^{1,2
, ,},
LI Hai^1,2

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

摘要

摘要: 采用微弧氧化(MAO)技術在7050鋁合金表面制備了陶瓷膜層,運用掃描電子顯微鏡(SEM)和能譜分析儀(EDS)表征陶瓷膜微觀結構,采用動電位極化曲線、電化學阻抗譜(EIS)和慢應變速率拉伸試驗(SSRT)研究了微弧氧化膜對7050鋁合金在3.5%(質量分數) NaCl水溶液中腐蝕和應力腐蝕開裂(SCC)行為的影響.結果表明:微弧氧化膜層由表面疏松層與內部致密層組成,表面疏松層主要由Al₂O₃組成,內部致密層由氧化鋁與鋁燒結而成.微弧氧化膜層可以有效抑制7050鋁合金表面的腐蝕萌生及明顯降低腐蝕速率,且使7050鋁合金的應力腐蝕敏感性出現顯著下降.
- 7050鋁合金 /
- 微弧氧化 /
- 腐蝕 /
- 應力腐蝕開裂 /
- 陶瓷膜層
Abstract: Ceramic coatings were formed on 7050 aluminum alloy (AA7050) by microarc oxidation (MAO). Subsequently, scanning electron microscopy (SEM) and energy-dispersive spectrometry (EDS) were used to evaluate the microstructure of the coatings. The coatings consist of an outer porous layer made of Al₂O₃ and an inner dense layer made of sintered alumina and aluminum substrate. Furthermore, potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were combined with slow strain rate tests (SSRT) to investigate the effect of microarc oxidation on the corrosion and stress corrosion cracking (SCC) of AA7050 in 3.5% NaCl solution. The corrosion on the surface of AA7050 and the corrosion rate and SCC decrease owing to the coatings on AA7050.
- 7050 aluminum alloy /
- microarc oxidation /
- corrosion /
- stress corrosion cracking /
- ceramic coatings

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參考文獻(13)

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