| Effect of Mn Modification on the Corrosion Susceptibility of Mg–Mn Alloys by Magnesium Scrap |
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| 作者姓名： | Dong-Dong Gu Jian Peng Jia-Wen Wang Zheng-Tao Liu Fu-Sheng Pan |
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| 作者单位： | State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Chongqing Research Center for Advanced Materials,Chongqing Academy of Science and Technology,Chongqing 401123,China |
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| 摘 要： | The microstructure and anti-corrosion behavior of Mg–Mn alloys by magnesium scrap have been investigated in this study.The results show that the size of the Fe-rich particles in magnesium scrap decreases but the quantity increases with the Mn addition.Although the presence of Mn-containing Fe-rich particles with unique symbiotic structure can eff ectively weaken the micro-galvanic corrosion,the presence of more free Fe(Fe-rich particles) does not necessarily lead to severe corrosion of the alloy.The corrosion susceptibility of Mg–Mn–Fe alloy primarily depends on the solubility of iron in the Mg matrix,while it can be significantly reduced by suitable Mn addition.Besides,the tolerance limit of the Fe impurity can be expressed as Fe_(max) = 0.0083 Mn(relative to the iron solubility).Only when the Fe/Mn ratio is below 0.0083 can the alloy have excellent corrosion resistance,with the corrosion rate changing in the scope of 0.38 ± 0.09 to 0.54 ± 0.15 mg/cm~2 day and i_(corr) from 3 to 9 × 10~(–4) A/cm~2.
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Effect of Mn Modification on the Corrosion Susceptibility of Mg-Mn Alloys by Magnesium Scrap |
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| Dong-Dong Gu,Jian Peng,Jia-Wen Wang,Zheng-Tao Liu,Fu-Sheng Pan.Effect of Mn Modification on the Corrosion Susceptibility of Mg-Mn Alloys by Magnesium Scrap[J].Acta Metallurgica Sinica(English Letters),2021,34(1):1-11. |
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| Authors: | Dong-Dong Gu Jian Peng Jia-Wen Wang Zheng-Tao Liu Fu-Sheng Pan |
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| Abstract: | The microstructure and anti-corrosion behavior of Mg-Mn alloys by magnesium scrap have been investigated in this study.The results show that the size of the Fe-rich particles in magnesium scrap decreases but the quantity increases with the Mn addition.Although the presence of Mn-containing Fe-rich particles with unique symbiotic structure can effectively weaken the micro-galvanic corrosion,the presence of more free Fe(Fe-rich particles)does not necessarily lead to severe corrosion of the alloy.The corrosion susceptibility of Mg-Mn-Fe alloy primarily depends on the solubility of iron in the Mg matrix,while it can be significantly reduced by suitable Mn addition.Besides,the tolerance limit of the Fe impurity can be expressed as Femax=0.0083 Mn(relative to the iron solubility).Only when the Fe/Mn ratio is below 0.0083 can the alloy have excel-lent corrosion resistance,with the corrosion rate changing in the scope of 0.38±0.09 to 0.54±0.15 mg/cm2 day and icorr from 3 to 9×10-4 A/cm2. |
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| Keywords: | Magnesium scrap Mn modification Fe impurity Corrosion susceptibility Corrosion resistance |
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