工業海洋大氣環境下陽極氧化6061鋁合金的電偶腐蝕行為

王沙沙; 楊浪; 肖葵; 黃運華; 李曉剛

doi:10.13374/j.issn2095-9389.2018.07.009

工業海洋大氣環境下陽極氧化6061鋁合金的電偶腐蝕行為

doi: 10.13374/j.issn2095-9389.2018.07.009

王沙沙¹,
楊浪¹,
肖葵^1,2,
黃運華^1,2, ,,
李曉剛^1,2

1) 北京科技大學腐蝕與防護中心, 北京 100083
2) 腐蝕與防護教育部重點實驗室, 北京 100083

基金項目:

國家重點研發計劃資助項目(2016YFB0300604)

國家自然科學基金資助項目(51471033)

詳細信息

中圖分類號: TG172.3
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- 被引次數: 0
出版歷程
- 收稿日期: 2017-09-12

Galvanic corrosion of anodized 6061 aluminum alloy in an industrial-marine atmospheric environment

1) Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2) Key Laboratory for Corrosion and Protection(MOE), Beijing 100083, China

摘要

摘要: 在青島典型的工業海洋大氣環境下,進行硼硫酸陽極氧化6061鋁合金與不同表面狀態的30CrMnSiNi2A結構鋼偶接件的戶外大氣暴露試驗,通過電化學測試、腐蝕產物分析、力學性能檢測、斷口分析等,研究了偶接件中陽極氧化6061鋁合金的腐蝕規律與機理.結果表明:經1 a戶外大氣暴露試驗后,與鍍鎘鈦結構鋼偶接的6061陽極氧化鋁合金力學性能最優,其強度σ_b和延伸率δ分別比原始試樣下降6.45%和4.39%,遠優于與結構鋼裸材偶接的陽極氧化6061鋁合金試樣(分別下降10%和62.28%),略優于未偶接試樣(分別下降6.77%和10.74%).沿晶腐蝕和表面點蝕是導致陽極氧化6061鋁合金力學性能下降的主要原因,最嚴重的沿晶腐蝕裂紋深度達150 μm.青島大氣中的硫化物不僅會侵蝕試樣表面形成硫酸鋁,還會浸入到晶界促進沿晶腐蝕.
- 陽極氧化6061鋁合金 /
- 電偶腐蝕 /
- 工業海洋大氣環境 /
- 力學性能 /
- 沿晶腐蝕
Abstract: 6061 aluminum alloy is a material that is widely used for manufacturing aircraft. Boron-sulfuric acid anodization is often used in the surface treatment of aluminum alloy to improve the corrosion resistance of the alloy in an outdoor atmosphere. However, few studies have been conducted on the galvanic corrosion of an anodized 6061 aluminum alloy coupled with high strength structural steel in an industrial-marine atmospheric environment. In this work, the outdoor atmospheric exposure test of an anodized 6061 aluminum alloy coupled with 30CrMnSiNi2A steel of different surfaces was conducted in an industrial-marine atmospheric environment. The corrosion behavior and mechanism of the anodized 6061 aluminum alloy coupled with steel were investigated by means of electrochemical measurement, corrosion product analysis, mechanical property testing, fracture analysis, and other measurements. After a one-year exposure test, the values of strength σ_b and elongation δ of the anodized 6061 aluminum alloy coupled with Cd-Ti plated 30CrMnSiNi2A steel decrease by 6.45% and 4.39%, respectively and have the lowest decline rate compared with the most serious decline rates of 10% and 62.28%, respectively, for the anodized 6061 coupled with naked 30CrMnSiNi2A steel and the moderate decline rates of 6.77% and 10.74%, respectively, for the uncoupled samples. The intergranular corrosion and pitting on the surface of anodized 6061 aluminum alloy result in a significant decrease in the mechanical property, with the deepest crack of intergranular corrosion reaching 150 μm. The sulfide in Qingdao atmosphere not only corrodes the surface of the samples to form aluminum sulfate but also permeates into the grain boundary to promote intergranular corrosion.
- anodized 6061 aluminum alloy /
- galvanic corrosion /
- industrial-marine atmospheric environment /
- mechanical property /
- intergranular corrosion

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參考文獻(16)

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