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| Polarization Performance of Two Aluminium AlloySacrificial Anodes |
| LIANG Hu1, DU Min1, ZHANG Youhui2 |
1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
2. Offshore Oil Engineering (Qingdao) Co., Ltd., Qingdao 266520, China |
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Abstract The polarization performance of two kinds of Al-Zn-In-Mg-Ti sacrificial anodes at different potential was studied by open circuit potential, constant current test, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the anodes were difficult to dissolve because of an oxide scale could form at open circuit potential. After an impressed current was applied to the anodes, the electric double layer capacitance gradually increased, the polarization resistance was gradually reduced, the oxide film gradually ruptured. With the increasing of polarization potential, the anode current increased rapidly, while the polarization resistance decreased and finally became stable. The anode with smaller polarization resistance exhibited a good electrochemical performance, which was consistent with the 4 d evaluation results by an accelerated test.
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Received: 06 May 2013
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