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首页> 外文期刊>Corrosion science >Unexpected cathodic role of Mg_(41)Sm_5 phase in mitigating localized corrosion of extruded Mg-Sm-Zn-Zr alloy in NaCl solution
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Unexpected cathodic role of Mg_(41)Sm_5 phase in mitigating localized corrosion of extruded Mg-Sm-Zn-Zr alloy in NaCl solution

机译：Mg_（41）Sm_5相在减轻NaCl溶液中挤压Mg-Sm-Zn-Zr合金局部腐蚀方面的意外阴极作用

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摘要

Effect of Mg41Sm5 second phase on corrosion of as-cast and extruded Mg-Sm-Zn-Zr alloys in NaCl solution was investigated. The net-like Mg41Sm5 phase played a cathodic role in the as-cast alloy and induced obvious localized corrosion of adjacent anodic alpha-Mg grains. However, hot-extrusion deformed the relatively large net-like Mg41Sm5 phase into uniformly dispersed finer particles, which effectively mitigated localized corrosion and formed uniform protective film on the whole alloy surface. It enhanced the corrosion resistance of the extruded alloy for three times compared with the as-cast counterpart and outperformed that of benchmark Mg alloy AZ91.
机译：研究了Mg41Sm5第二相对铸态和挤压态的Mg-Sm-Zn-Zr合金在NaCl溶液中腐蚀的影响。呈网状的Mg41Sm5相在铸态合金中起阴极作用，并引起相邻的阳极α-Mg晶粒明显的局部腐蚀。然而，热挤压将相对较大的网状Mg41Sm5相变形为均匀分散的细颗粒，从而有效减轻了局部腐蚀并在整个合金表面上形成了均匀的保护膜。与铸态合金相比，它使挤压合金的耐蚀性提高了三倍，并且优于基准镁合金AZ91。

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