Aria Afsharnaderi, M. Lotfpour, A. Bahmani, H. Mirzadeh, M. Malekan, M. Emamy, Mojtaba Fatehi Mollayousef, Soraya Bornay Zonoozi
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引用次数: 0
摘要
研究了锶(Sr)和稀土元素(RE)对铸态Mg-9Al-1Zn合金腐蚀性能的协同作用。通过添加0.5 wt-% RE和0.5 wt-% Sr (RE/Sr比为1)，AZ91的腐蚀速率显著降低。其原因与通过对β-Mg17Al12相进行改性(使其形貌由半连续变为更接近球形)减少微电偶腐蚀以及形成适量的Al11RE3和Al4Sr金属间化合物有关。然而，过量的稀土/锶比降低了材料的耐蚀性，这可能与过量的Al11RE3和Al4Sr金属间化合物的微电效应有关。
Enhanced corrosion resistance of the as-cast AZ91 magnesium alloy by micro-addition of the strontium and rare earth elements
The synergetic effect of strontium (Sr) and rare earth elements (RE) on the corrosion properties of as-cast Mg–9Al–1Zn alloy were studied. Via the addition of 0.5 wt-% RE and 0.5 wt-% Sr (RE/Sr ratio of 1), a remarkable reduction in the corrosion rate of AZ91 was observed. The reason was found to be related to the decrement of the micro-galvanic corrosion by the modification of the β-Mg17Al12 phase (changing its morphology from semi-continuous to a more spheroid shape) and formation of proper amounts of Al11RE3 and Al4Sr intermetallics. However, the excess RE/Sr ratio impaired the corrosion resistance, which can be related to the micro-galvanic effect by excess amounts of Al11RE3 and Al4Sr intermetallics.
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