二氧化硫復合鹽霧環境下2024-T351鋁合金應力腐蝕開裂

滿成; 張歡; 董超芳; 余強; 肖葵; 李曉剛

doi:10.13374/j.issn2095-9389.2017.04.009

二氧化硫復合鹽霧環境下2024-T351鋁合金應力腐蝕開裂

doi: 10.13374/j.issn2095-9389.2017.04.009

北京科技大學腐蝕與防護中心, 北京 100083

詳細信息

中圖分類號: TG172.3
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出版歷程
- 收稿日期: 2016-07-09

Stress corrosion cracking of 2024-T351 aluminum alloy in SO₂ mixed salt spray environment

Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

摘要

摘要: 通過SO₂復合鹽霧試驗模擬工業污染海洋大氣環境,結合有限元模擬分析、掃描電鏡/能譜儀、光電子能譜分析等技術研究2024-T351鋁合金在彈性應力區間的應力腐蝕開裂行為.結果表明:應力腐蝕開裂行為優先發生在2024-T351鋁合金C型環的頂部應力集中區域;疏松的腐蝕產物層的形貌經歷了由細棒狀、團絮狀到板塊狀的變化;試驗6 h就可以監測到裂紋,進行到480 h的時候有貫穿裂紋形成,720 h的時候試樣完全斷裂;裂紋為穿晶和沿晶混合機制,主裂紋以穿晶機制沿C型環法線擴展,二次裂紋沿晶界擴展.
- 鋁合金 /
- 大氣腐蝕 /
- 二氧化硫 /
- 應力腐蝕開裂
Abstract: The stress corrosion cracking of 2024-T351 aluminum alloy was investigated by finite element simulation analysis, scanning electron microscopy/energy dispersive spectrometry, and X-ray photoelectron spectroscopy through SO₂ mixed salt spray test. Results indicate that stress corrosion cracking initiates preferentially at the region of stress concentration of the C-ring top for 2024-T351 aluminum alloy. The morphologies of loose corrosion products change from fine rod-like and flocculent to plate-like. Secondary cracks form in the internal corrosion crack after 6 h, when the corrosion time increases to 480 h, and the fractures and cracks in the surface of the C-ring side penetrate the whole sample. The C-ring sample completely breaks after 720 h. The opening crack propagation is a mixed mode of transgranular and intergranular, while the main cracks extend along the normal of the C-ring and the secondary cracks extend mainly along the grain boundaries.
- aluminum alloy /
- atmospheric corrosion /
- sulfur dioxide /
- stress corrosion cracking

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參考文獻(12)

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