海水环境中典型阴离子对5083铝合金腐蚀行为的影响

doi:10.13208/j.electrochem.160614

电化学（中英文） ›› 2017, Vol. 23 ›› Issue (4): 466-472. doi: 10.13208/j.electrochem.160614

海水环境中典型阴离子对5083铝合金腐蚀行为的影响

涂扬帆^1,3，冯立明¹，方志刚²，刘海涛³，井明华³，管勇^2,3*

1. 山东建筑大学材料科学与工程学院，山东济南 250101; 2. 海军装备研究院，北京 100161; 3.中国科学院金属研究所，辽宁沈阳 110016

收稿日期:2016-06-14 修回日期:2016-07-20 出版日期:2017-08-25 发布日期:2016-08-02
通讯作者: 管勇 E-mail:yguan@imr.ac.cn
基金资助:
国家自然科学基金项目（51201169）资助

Influence of Typical Anions in Seawater Environments on Corrosion Behaviors of 5083 Aluminum Alloy

TU Yang-fan^1,3, FENG Li-ming¹, FANG Zhi-gang² , LIU Hai-tao³, JING Ming-hua³, GUAN Yong^2,3*

1. Department of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China; 2. Naval Academy of Armament, Beijing 100161, China; 3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

Received:2016-06-14 Revised:2016-07-20 Published:2017-08-25 Online:2016-08-02
Contact: GUAN Yong E-mail:yguan@imr.ac.cn

摘要/Abstract

摘要：

采用析因分析试验及动电位极化曲线、电化学阻抗谱(EIS)等测试方法，研究了海水环境因素中的典型阴离子（Cl^-、 HCO₃^-、 SO₄^2-交互作用对5083铝合金耐蚀性的影响. 结果表明,三种阴离子中，Cl^-、HCO₃^-对铝合金点蚀起促进作用. Cl-与HCO₃^-交互作用时，在Cl^-浓度一定的情况下，随着HCO₃^-浓度的增加，5083铝合金耐蚀性呈现出上升→下降→再上升的趋势，在70～90 mg•L^-1时耐蚀性能明显降低；在HCO₃^-浓度一定的情况下，Cl^-浓度较低时5083铝合金耐蚀性比Cl^-浓度较高时差. 在Cl^-、 HCO₃^-浓度较低情况下，SO₄^2-具有抑制腐蚀的作用；当Cl^-、 HCO₃^-浓度较高时，SO₄^2-抑制腐蚀的作用不明显.

关键词: 5083铝合金, 耐蚀性, 电解质效应, 海水环境

Abstract: The interaction effects of typical anions, namely, Cl^-, HCO₃^- and SO₄^2-, presented in seawater environments on corrosion resistance behaviors of AA5083 aluminum alloy have been studied. The corrosion resistances of the 5083 aluminum alloy in different simulated seawater environments were tested by factorial analysis method. The polarization curves, the corrosion potentials, corrosion current densities and the breakdown potentials were examined in different concentrations of Cl^-, HCO₃^- and SO₄^2-.The corrosion behavior was analyzed by electrochemical impedance spectroscopy (EIS). The results showed that both Cl^-, and HCO₃^- could accelerate the pitting corrosion. When the concentration of Cl^-, remained constant, the corrosion resistance of AA5083 aluminum alloy increased initially with an increase in the concentration of HCO₃^-,and then dropped dramatically at 70～90 mg•L^-1, which displayed the best corrosion resistance performance. Afterwards, the corrosion resistance increased again. The corrosion current density of AA5083 aluminum alloy was not significantly affected by SO₄^2- when the concentrations of Cl^- and HCO₃^- became larger. Meanwhile, when the concentration of HCO₃^- was fixed, the charge-transfer resistance of AA5083 aluminum alloy at a lower Cl^-concentration was smaller than that at a higher Cl^- concentration, and the corrosive ions could easily penetrate the native oxide film by a redox reaction with the matrix.

Key words: 5083 aluminum alloy, corrosion resistance, electrolyte effect, seawater environment

中图分类号:

O646.6

涂扬帆，冯立明，方志刚，刘海涛，井明华，管勇. 海水环境中典型阴离子对5083铝合金腐蚀行为的影响[J]. 电化学（中英文）, 2017, 23(4): 466-472.

TU Yang-fan, FENG Li-ming, FANG Zhi-gang,LIU Hai-tao, JING Ming-hua, GUAN Yong. Influence of Typical Anions in Seawater Environments on Corrosion Behaviors of 5083 Aluminum Alloy[J]. Journal of Electrochemistry, 2017, 23(4): 466-472.

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海水环境中典型阴离子对5083铝合金腐蚀行为的影响

Influence of Typical Anions in Seawater Environments on Corrosion Behaviors of 5083 Aluminum Alloy

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