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| Electrochemical Performance of Al-Zn-Sn-Ce Sacrificial Anode in Alternating Dry and Wet Environment |
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| DOI：10.7643/issn.1672-9242.2023.06.010 |
| KeyWord:alternating dry and wet environment underwater equipment sacrificial anode electrochemical |
| Author | Institution |
| ZHANG Yi-han |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| YANG Mei-tong |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China;School of Mechanical Engineering, Liaoning Petrochemical University, Liaoning Fushun , China |
| ZHANG Hai-bing |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| MA Li |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| LI Zhen |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
| DUAN Ti-gang |
State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Shandong Qingdao , China |
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| Abstract: |
| The work aims to carry out the electrochemical performance test of the new sacrificial anode in alternating dry and wet environment to evaluate the cathodic protection effect of the material, so as to meet the cathodic protection requirements of high-strength steel equipment. Al-Zn-Sn-Ce low-potential sacrificial anode samples were prepared by high-temperature smelting method and subject to electrochemical performance test, electrochemical characterization test and corrosion micro-morphology characterization of sacrificial anode in alternating dry and wet environments at different water immersion rates (the time ratio of dry and wet conditions was 1:1, 3:1, and 7:1). By comparing the test data and material morphology characterization results, the electrochemical performance of aluminum alloy sacrificial anode in the alternating dry and wet environment was comprehensively analyzed, and the effect of alternating dry and wet environment factors on the anodic dissolution behavior was explored. The working potential of Al-Zn-Sn-Ce sacrificial anode in various test environments was ‒0.70~‒0.81 V (vs.SCE), which met the requirements of high-strength steel cathodic protection potential. The dissolution morphology of anode surface was relatively uniform, and the electrochemical micro-regions of anode and cathode on the surface were evenly distributed. With the increasing time ratio of dry and wet test environment, the working potential of the anode shifted positively and the deposition and crusting of the surface corrosion products in the dry environment led to a decrease in the anodic activation and dissolving ability. The corrosion reaction was suppressed to a certain extent, and the anode current efficiency was maintained above 75%. With the increase of the time ratio of the dry and wet test environment, the working potential of the sacrificial anode in the alternating dry and wet test environment shifts positively. The self-corrosion reaction is inhibited, and the Al-0.7Zn-0.1Sn-0.1Ce low-potential sacrificial anode exhibits good cathodic protection performance in a complex alternating wet and dry environment. |
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