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| Effects of Temperature on Electrochemical Behaviors of Magnesium Sacrificial Anodes |
| Received:April 28, 2019 Revised:May 15, 2019 |
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| DOI：10.7643/issn.1672-9242.2019.11.012 |
| KeyWord:magnesium alloy sacrificial anode temperature electrochemical behavior artificial seawater |
| Author | Institution |
| LI Hui |
Changqing Oil and Gas Technology Institute, PCOC, Xi'an , China |
| SUN Yu-lai |
Changqing Oil and Gas Technology Institute, PCOC, Xi'an , China |
| YANG Li-hua |
Changqing Oil and Gas Technology Institute, PCOC, Xi'an , China |
| LIU Ting |
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan , China |
| QIU Yu-bing |
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan , China |
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| Abstract: |
| Objective To study on the effect of temperature on the electrochemical behaviors of magnesium sacrificial anodes MIC, AZ31 and AZ63. Methods According to GB/T 17848—1999 standard, the electrochemical performance of three types of commercial magnesium sacrificial anodes were evaluated in artificial sea water at 25-70℃ by the four-day acceleration method. The macrocorrosion morphology of the anode after corrosion was observed; the polarization behaviors of the anodes before and after the four-day acceleration test were studied with the polarization curve measuring and testing technique. Results With the increase of temperature, the local corrosion of the anodes became more serious, making their dissolution state non-homogeneous. The effective current capacities and current efficiencies of the anodes increased slightly with T. The temperature had no significant influence. The polarization curves of the anodes indicated that magnesium anode displayed active dissolution state. With the increase of temperature, the cathodic process of magnesium anode was promoted largely to increase their corrosion rates. Conclusion The increasing T accelerates the corrosion of these anodes in their initial corrosion period, but its effect on their electrochemical performance is not obvious, which may be related to the corrosion products on the Mg anodes and the change of their surface conditions with the proceed of corrosion. |
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