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| Electrochemical Properties of Al-Mg-Ga Sacrificial Anode |
| Received:October 07, 2017 Revised:March 15, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.03.006 |
| KeyWord:Al-Mg-Ga aluminium alloy Al-Al composite anode simulation field test initial polarization property coupling potential |
| Author | Institution |
| GAO Qing-yang |
School of Materials Science and Engineering, Xi′an Jiaotong University, Xi′an , China |
| ZHAO Rui |
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao , China |
| WANG Huan-huan |
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao , China |
| DU Min |
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao , China |
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| Abstract: |
| Objective To research electrochemical performance of Al-Mg-Ga sacrificial anode and the proper ties of the composite anode, which were combined with the standand aluminium alloy sacrificial anode. Methods An Al-Mg-Ga aluminium alloy sacrificial anode was designed to study electrochemical property, initial polarization property and coupling potential with Al-Zn-In matrix anode at different area ratio by 4-day acceleration test and simulation field test. SEM and EDX analysis were used to discuss the excitation mechanism. Results The open circuit potential and working potential of Al-Mg0.6%-Ga0.05% sacrificial anode were more negative, reaching -1.5 V (vs. SCE) and -1.3 V (vs. SCE) respectively. It was suitable to be used as active anode in composite anode. The simulation field test showed that the initial polarization property of Al-Al composite anode was good in cathodic protection. It could put large current to get the coupling potential between -1.2 to -1.3 V (vs. SCE). Conclusion The initial current sent by Al-Al composite anode developed is 3 times more than that of the middle current, at the same time, the area ratio of different design of composite anode coupled potential is 1.2 - 1.3 V (vs. SCE). |
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