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| Performance of Al-Zn-In Alloys Sacrificial Anodes under Cyclic Immersion Condition |
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| DOI：10.7643/issn.1672-9242.2022.08.010 |
| KeyWord:aluminum alloy sacrificial anode electrochemical performance cyclic immersion wet-dry cycle marine corrosion |
| Author | Institution |
| WANG Wei-gang |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| CHENG Xin |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| LIAO Hui-min |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| DOU Wen-wen |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| CHEN Shi-qiang |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| LIU Guang-zhou |
Institute of Marine Science and Technology, Shandong University, Shandong Qingdao , China |
| TANG Biao |
Shandong Derui Anti-Corrosion Materials Co., Ltd., Shandong Zibo , China |
| LU Yan-wei |
Shandong Derui Anti-Corrosion Materials Co., Ltd., Shandong Zibo , China |
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| Abstract: |
| This research aims to explore the electrochemical performance of four commonly used Al-Zn-In alloys sacrificial anodes (Al-Zn-In, Al-Zn-In-Cd, Al-Zn-In-Mg-Ti, Al-Zn-In-Mg-Ga-Mn) under seawater cyclic immersion condition, such parameters as the open circuit potential, closed circuit potential, actual capacity, current efficiency and dissolution morphology of four anodes were studied by constant current method and the electrochemical performance further analyzed with electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. Furthremore, the current efficiency of Al-Zn-In, Al-Zn-In-Mg-Ti, Al-Zn-In-Mg-Ga-Mnanodes was higher than 88.92%, and the closed circuit potential ranged from−0.96 V to−1.10 V, which could meet the needs of protection of carbon steel in cyclic immersion condition. In addition, the anodic dissolution morphology of Al-Zn-In-Mg-Ga-Mn was even, while the morphology of Al-Zn-In and Al-Zn-In-Mg-Ti was slightly worse. The current efficiency of Al-Zn-In-Cd anode was only 80.95%, and the closed circuit potential ranged from −0.93 V to −1.10 V. Moreover, the dissolution morphology was uneven, and the electrochemical performance was worst in this study. This can be demonstrated that the corrosion products attached to the anode surface are repeatedly dehydrated in atmosphere, thereby forming shell, which leads to the positive shift of potential, and thus hinders the further activation of the anode. The results show that electrochemical performance of four anodes under cyclic immersion condition may be ranked as the following order:Al-Zn-In-Mg-Ga-Mn>Al-Zn-In>Al-Zn-In-Mg-Ti>Al-Zn-In-Cd, and the first three anodes are suitable for cathodic protection of marine structures in cyclic immersion condition. |
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