2O3的形成有關；而LDHs/6061Al合金的阻抗在不同溶解氧濃度下未發(fā)生明顯變化，表現(xiàn)出對溶解氧優(yōu)異的隔絕性能。"/>

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LDHs對6061鋁在不同溶解氧濃度的NaCl溶液中腐蝕行為的影響
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作者單位:

1.廣西有色金屬及特色材料加工重點實驗室，廣西 南寧 530004;2.廣西大學 資源環(huán)境與材料學院，廣西 南寧 530004

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基金項目:

Guangxi Science and Technology Major Project [grant No. AA17204100], National Natural Science Foundation of China [grant No. 11975082].


Effect of LDHs on Corrosion Behavior of 6061Al Alloy in NaCl Solution with Different Dissolved Oxygen Contents
Author:
Affiliation:

1.Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Nanning 530004, China;2.School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China

Fund Project:

National Natural Science Foundation of China (11975082); Guangxi Science and Technology Major Project (AA17204100)

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    摘要:

    通過原位合成法在6061Al合金表面制備了層狀雙氫氧化物（LDHs），使用極化曲線（Tafel）和電化學阻抗譜（EIS）研究了在3.5%（質(zhì)量分數(shù)）NaCl溶液中不同溶解氧濃度（1~16 mg/L）下LDHs對6061Al合金腐蝕行為的影響。結(jié)果表明，6061Al合金與LDHs/6061Al合金的極化過程均受到溶解氧的擴散控制。隨著溶解氧濃度的增加，6061Al合金的腐蝕更加劇烈，其腐蝕電流由1.273 μA增加到了1.743 μA，蝕坑深度由12 μm增加到了19 μm。而LDHs/6061Al合金在各溶解氧濃度下均未觀察到蝕坑，這是由于LDHs薄膜阻礙了溶解氧的擴散，其極化過程受到了抑制。此外，隨著溶解氧濃度的增加，6061Al合金的阻抗顯著增加，這與Al2O3的形成有關；而LDHs/6061Al合金的阻抗在不同溶解氧濃度下未發(fā)生明顯變化，表現(xiàn)出對溶解氧優(yōu)異的隔絕性能。

    Abstract:

    The layered double hydroxides (LDHs) were prepared on 6061Al alloy by in-situ synthesis. The effects of LDHs on the corrosion behavior of 6061Al alloy in 3.5wt% NaCl solution with different dissolved oxygen (DO) contents (1~16 mg/L) were analyzed through the polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). The results indicate that the polarization processes of 6061Al and LDHs/6061Al alloys are controlled by DO diffusion. With increasing the DO content, a large number of pits appear on the 6061Al alloy surface, and the pit is gradually deepened. The corrosion current is increased from 1.273 μA to 1.743 μA, and the pit depth is increased from 12 μm to 19 μm. However, no pits can be observed in LDHs/6061Al alloy at different DO contents, which is attributed to the inhibition of DO diffusion and the polarization process. In addition, the resistance of 6061Al alloy is increased with increasing the DO content, which is related to the formation of Al2O3. However, the resistance of LDHs/6061Al alloy has no obvious change at different DO contents, showing excellent isolation performance against DO.

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袁增崟,王友彬,鄒瑞,楊元成,韋悅周,藤田豐久.LDHs對6061鋁在不同溶解氧濃度的NaCl溶液中腐蝕行為的影響[J].稀有金屬材料與工程,2022,51(5):1589~1596.[Zengyin Yuan, Youbin Wang, Rui Zou, Yuancheng Yang, Yuezhou Wei, Toyohisa Fujita. Effect of LDHs on Corrosion Behavior of 6061Al Alloy in NaCl Solution with Different Dissolved Oxygen Contents[J]. Rare Metal Materials and Engineering,2022,51(5):1589~1596.]
DOI：10.12442/j. issn.1002-185X.20210559

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  • 收稿日期:2021-06-30
  • 最后修改日期:2021-08-18
  • 錄用日期:2021-08-24
  • 在線發(fā)布日期: 2022-05-31
  • 出版日期: 2022-05-30