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| Calculation Analysis and Verification of the Effect of Mg2Sn on Corrosion Resistance of Magnesium Alloy |
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| DOI：10.7643/issn.1672-9242.2023.03.012 |
| KeyWord:Mg2Sn first-principles calculation ZA series magnesium alloy micro galvanic corrosion work function surface energy |
| Author | Institution |
| ZHANG Yu |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| WANG Bo |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| WEI Shi-cheng |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| CHEN Xian-hua |
College of Materials Science and Engineering, Chongqing University, Chongqing , China |
| LI Lin-wei |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| WANG Yu-jiang |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
| LIANG Yi |
National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing , China |
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| Abstract: |
| The work aims to analyze the effect of the main precipitate Mg2Sn of magnesium alloy on the corrosion resistance of ZA series magnesium alloy from the perspective of calculation and carry out verification by test. The first-principles calculation method was used to calculate the surface energy and work function of Mg2Sn. The effect of Mg2Sn on the corrosion resistance of ZA series magnesium alloy was analyzed by comparing the surface energy and work function of the constructed Mg matrix and the Mg doped with Zn and Al. In order to verify the calculation results, Mg-5Zn-3Al-0Sn alloy and Mg-5Zn-3Al-3Sn alloy were prepared. The corrosion resistance of the two alloys was compared through electrochemical experiment, and the effect of Mg2Sn on the corrosion resistance of ZA series magnesium alloy was studied. The surface energy and work function of Mg matrix were calculated, which were in good agreement with other results. The work functions on different surfaces of Mg2Sn were calculated. By comparing the results on surfaces of Mg, Mg-Zn and Mg-Al, it was found that the work functions on the surfaces of Mg2Sn were higher. XRD results indicated that the Mg-5Zn-3Al-3Sn alloy had obvious Mg2Sn phase. The electrochemical test results showed that the corrosion resistance of Mg-5Zn-3Al-0Sn was better than that of Mg-5Zn-3Al-3Sn. According to the first-principles calculation, the work function of Mg2Sn is higher than that of Mg matrix surface, indicating that micro galvanic corrosion is easy to occur in the alloy, and Mg2Sn acts as a cathode phase to promote the corrosion of Mg alloy. The results of electrochemical test also show that the corrosion resistance of the Mg alloy decreases when there is obvious Mg2Sn phase, and the corrosion potential reaches ‒1.21 V. |
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