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Microstructure and Corrosion Properties of Fine-Grained Mg-Based Alloys

机译:细晶镁基合金的组织和腐蚀性能

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The influence of various processing routes (casting, extrusion, ECAP) on microstructure evolution and electrochemical properties of the magnesium alloy AZ80 were investigated. Both extrusion and ECAP were found to result in significant grain refinement (by a factor of 100 in the ECAP alloy) of the as cast AZ80 alloy. The electrochemical impedance spectroscopy was used to characterize the electrochemical properties of the surface of different microstructure states of the alloy. After the exposure to the corrosion environment containig aggressive chloride ions (0.1M NaCl) a complex polarization layer consisting of two different layers was formed on the specimen surface. The first compact layer directly adjoined to the specimen surface while the second porous layer was formed on the first layer. Microstructure changes due to extrusion and equal channel angular pressing were found to influence the stability of these layers. In the as cast alloy the compact layer was broken already during the first 24 hours of the exposure, while the compact layer in the extruded specimen remained unchanged up to 72 hours of the exposure. In the ECAP specimen both layers remained stable even after 96 hours of the exposure and no degradation occurred. Enhanced electrochemical properties were therefore found in the ultrafine-grained ECAP specimen.
机译:研究了各种工艺路线(铸造,挤压,ECAP)对镁合金AZ80的组织演变和电化学性能的影响。发现挤压和ECAP都可以使铸态AZ80合金的晶粒细化(在ECAP合金中为100倍)。电化学阻抗谱用于表征合金的不同微观结构状态的表面的电化学性质。暴露于腐蚀环境中的侵蚀性氯离子(0.1M NaCl)暴露后,在试样表面形成了由两个不同层组成的复合极化层。第一紧密层直接与样品表面邻接,而第二多孔层形成在第一层上。发现由于挤压和等通道角挤压而引起的微观结构变化会影响这些层的稳定性。在铸态合金中,在暴露的最初24小时内,致密层已经破裂,而在挤出样品中的致密层在暴露的72小时内仍保持不变。在ECAP样品中,即使暴露96小时,两层仍保持稳定,并且没有发生降解。因此,在超细粒ECAP样品中发现了增强的电化学性能。

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