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首页> 外文期刊>International Journal of Electrochemical Science >Sintering Behaviour, Graded Microstructure and Corrosion Performance of Sintered Fe-Mn Biomaterials
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Sintering Behaviour, Graded Microstructure and Corrosion Performance of Sintered Fe-Mn Biomaterials

机译：Fe-Mn生物材料的烧结行为，梯度组织和腐蚀性能

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This article discusses the corrosion of sintered Fe-Mn alloys, as influenced by spatial variability inmicrostructure and composition. Materials of interest were manufactured by mixing an iron powderwith 25, 30 and 35wt.% of manganese powder, pressing the mixtures in a die and sintering. Particlesthat the sintered materials were comprised of possessed ferritic/martensitic core regions and austeniticpheripheries. While the thickness of austenite shell seemed to increase with increasing Mn content forFe-25Mn and Fe-30Mn materials, it appeared to fall to its lowest value for the Fe-35Mn material. Thecorrosion potential of a material exposed to Hank's solution increased with increasing Mn content forMn-poorer materials but fell to its lowest value for the Mn-richest material. The fractal dimension ofan electrochemical noise generated in corroding material was much lower than 1.5 for Mn-poorermaterials but increased to the "white noise" value of 1.5 for the Mn-richest material. Corrosion rates ofall materials were higher than those reported for homogeneous Fe-Mn alloys. It was concluded thatwhile the Mn-richest material was very likely undergoing general corrosion, Mn-poorer materialssuffered from galvanic interaction between particle cores and pheripheries and their corrosion wasdominated by localized events.
机译：本文讨论了受空间微观结构和成分变化影响的Fe-Mn烧结合金的腐蚀。通过将铁粉与25％，30％和35wt。％的锰粉混合，在模具中压制混合物并烧结来制造目标材料。由烧结材料组成的颗粒具有铁素体/马氏体核心区和奥氏体外围。对于Fe-25Mn和Fe-30Mn材料，虽然奥氏体壳的厚度似乎随着Mn含量的增加而增加，但对于Fe-35Mn材料，它似乎已降至最低值。对于贫锰材料，暴露于汉克溶液中的材料的腐蚀电位随锰含量的增加而增加，而对于富锰材料而言，腐蚀电位降至其最低值。对于贫锰材料，腐蚀材料中产生的电化学噪声的分形维数远低于1.5，但对于富锰材料，其“白噪声”值增加到1.5。所有材料的腐蚀速率均高于均相Fe-Mn合金。可以得出结论，尽管最富锰的材料很可能会发生全面腐蚀，但贫锰材料却受到颗粒核与外围之间的电相互作用的影响，其腐蚀主要受局部事件的影响。

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