Effect of Mn Modification on the Corrosion Susceptibility of Mg–Mn Alloys by Magnesium Scrap
来源期刊：Acta Metallurgica Sinica2021年第1期
论文作者：Dong-Dong Gu Jian Peng Jia-Wen Wang Zheng-Tao Liu Fu-Sheng Pan
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 Femax = 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/cm2 day and icorr from 3 to 9 × 10–4 A/cm2.
Dong-Dong Gu1，Jian Peng1,2，Jia-Wen Wang1，Zheng-Tao Liu1，Fu-Sheng Pan1,2
1. State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University2. Chongqing Research Center for Advanced Materials,Chongqing Academy of Science and Technology
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 Femax = 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/cm2 day and icorr from 3 to 9 × 10–4 A/cm2.
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