| Bi含量对Al-Zn-Ga-Si-Bi合金电化学性能和腐蚀形貌影响 |
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| 引用本文： | 郭建章,胡崇巍,张海兵.Bi含量对Al-Zn-Ga-Si-Bi合金电化学性能和腐蚀形貌影响[J].腐蚀科学与防护技术,2019,31(5):489-494. |
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| 作者姓名： | 郭建章 胡崇巍 张海兵 |
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| 作者单位： | 青岛科技大学机电工程学院 青岛266100;青岛科技大学机电工程学院 青岛266100;中国船舶重工集团公司第七二五研究所 海洋腐蚀与防护重点实验室 青岛266237;中国船舶重工集团公司第七二五研究所 海洋腐蚀与防护重点实验室 青岛266237 |
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| 摘 要： | 通过在Al-Zn-Ga-Si低电位牺牲阳极材料中添加Bi来改善阳极的性能,以不同Bi含量制备了5种牺牲阳极材料。通过电化学性能测试、极化曲线以及电化学阻抗谱测试来分析Bi对阳极电化学性能的影响;采用三维视频和宏观表征来分析Bi对阳极腐蚀形貌的影响。结果表明,添加适量Bi可以有效破坏铝合金阳极表面的氧化膜,提高阳极活化性能,并减少晶界腐蚀的作用,改善阳极的溶解形貌,但Bi含量过高时反而降低阳极的均匀活化性能,当Bi含量为0.05%(质量分数)时阳极综合性能良好,可用作高强钢的阴极保护。
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| 关 键 词： | BI 低电位牺牲阳极 电化学性能 溶解形貌 |
| 收稿时间： | 2019-01-28 |
Effect of Bi on Electrochemical Performance and Corrosion Morphology of Al-Zn-Ga-Si-Bi Alloy |
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| GUO Jianzhang,HU Chongwei,ZHANG Haibing.Effect of Bi on Electrochemical Performance and Corrosion Morphology of Al-Zn-Ga-Si-Bi Alloy[J].Corrosion Science and Protection Technology,2019,31(5):489-494. |
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| Authors: | GUO Jianzhang HU Chongwei ZHANG Haibing |
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| Affiliation: | (College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266100,China;State Key Laboratory for Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Qingdao 266237,China) |
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| Abstract: | Five low voltage sacrificial anode materials, namely Al-Zn-Ga-Si-based alloys with different Bi-addition were prepared. Then the effect of Bi on the electrochemical performance of alloys were assessed by means of electrochemical performance test, polarization curve measurement and electrochemical impedance spectroscopy, while the corrosion morphology of the alloys was characterized by macroscopic observation and 3D microscopic image. The results showed that an appropriate amount of Bi addition could effectively prevent the formation of oxide scale on the anode surface and alleviate the grain boundary corrosion, thereby improve the activation performance of the anode with a peculiar dissolution morphology. But the excessive addition of Bi in the alloy would reduce the uniform activation performance of the anode. The optimal Bi content of 0.05% (mass fraction) in the Al-Zn-Ga-Si-Bi anode is accepted as a low-potential sacrificial anode to provide cathodic protection for high strength steel. |
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| Keywords: | Bi element low voltage sacrificial anode electrochemical performance dissolution morphology |
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