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首页> 外文期刊>Journal of Materials Science >Room temperature corrosion properties of AZ31 magnesium alloy processed by extrusion and equal channel angular pressing
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Room temperature corrosion properties of AZ31 magnesium alloy processed by extrusion and equal channel angular pressing

机译：等通道角挤压挤压AZ31镁合金的室温腐蚀性能

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摘要

The electrochemical properties of AZ31 magnesium alloy processed by extrusion and equal channel angular pressing (ECAP) were investigated. The electrochemical properties were evaluated using potentiodynamic tests and electrochemical impedance spectroscopy in corrosion solution of 0.1 M sodium chloride. The electrochemical changes of the sample surface were correlated with microstructure evolution. Material processed by extrusion and subsequently by 8 passes of ECAP shows similar or even inferior corrosion resistance to the extruded material after immersion time up to 96 h. However, corrosion resistance of material after extrusion and ECAP is significantly better than that of the extruded material for immersion time of 168 h. This sudden improvement is caused by different formation and fall off of protective corrosion products. Microstructure after extrusion is inhomogeneous and contains relatively large grains, whereas material after ECAP possesses homogeneous ultrafine-grained (UFG) microstructure. As a result, material after ECAP offers more corrosion nucleation sites, but UFG microstructure causes that only smaller clusters of corrosion products fall off the surface. The easier and faster corrosion protective layer restoration on the surface of UFG material after ECAP leads to enhanced corrosion resistance.
机译：研究了挤压和等通道角挤压（ECAP）处理的AZ31镁合金的电化学性能。使用电势测试和电化学阻抗谱在0.1 M氯化钠腐蚀溶液中评估电化学性能。样品表面的电化学变化与微观结构的演变有关。浸泡时间长达96小时后，通过挤压加工以及随后经过8次ECAP加工的材料显示出与挤压材料相似甚至更低的耐腐蚀性。但是，在168 h的浸泡时间下，挤压和ECAP后的材料的耐蚀性明显优于挤压后的材料。这种突然的改善是由保护性腐蚀产物的不同形成和脱落引起的。挤压后的微观结构是不均匀的，并且包含相对较大的晶粒，而ECAP之后的材料则具有均匀的超细晶粒（UFG）微观结构。结果，ECAP之后的材料提供了更多的腐蚀成核位置，但是UFG的微观结构导致只有较小的腐蚀产物簇从表面掉落。 ECAP后，UFG材料表面更容易，更快速地恢复腐蚀保护层，从而增强了耐腐蚀性。

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