可生物降解ZX10合金腐蚀过程与结构因素和局部pH值的关系

P. Myagkikh, E. Merson, V. Poluyanov, D. Merson
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引用次数: 0

摘要

镁可生物降解合金是一种很有前途的自溶性外科植入材料。由于基体与二次相颗粒和夹杂物之间的电偶效应,镁对电化学腐蚀非常敏感。另一个重要因素是pH值。某些化学反应的行为取决于pH值,因此可以假设材料表面腐蚀性介质的pH值是决定化学反应在那里发生的一个因素。最后,有证据表明,晶粒晶体取向的变化可能是腐蚀性能各向异性的原因。这项工作的目的是揭示微观结构元素的电极电位、晶粒的结晶取向以及腐蚀溶液近表面体积的pH值对腐蚀过程的影响。在ZX10合金样品上标记了2×1.5 mm的截面,绘制了晶体取向分布图和化学成分分布图。为了评估粒子电极电位的影响,作者在90×90µm区域进行了开尔文探针测绘。接下来,通过对标记区域表面的视频拍摄进行腐蚀测试。为了确定pH值的影响,改变了细胞内的溶液循环。试验完成后,对腐蚀产物和腐蚀损伤进行了详细检查。根据结果,液体近表面微体积中的pH值比颗粒的电极电位具有更大的影响,因为它会引发不同成分的腐蚀产物的形成,从而导致颗粒周围表面的钝化。作者确定了两种不同类型的丝状腐蚀。对于丝状腐蚀,建立了腐蚀方向与晶粒结晶取向之间的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The dependence of the biodegradable ZX10 alloy corrosion process on the structural factors and local pH level
Magnesium biodegradable alloys are a promising material for self-dissolving surgical implants. Magnesium is known to be sensitive to electrochemical corrosion due to the galvanic effect between the matrix and particles of secondary phases and inclusions. Another important factor is the pH level. The behavior of certain chemical reactions depends on the pH level, so one can assume that the pH level of a corrosive medium at the material surface is a factor determining what chemical reactions can occur there. Finally, there is evidence that variability of the crystallographic orientation of the grains may be a cause of anisotropy of corrosion properties. The purpose of this work is to reveal the influence of the electrode potential of the microstructural elements, the crystallographic orientation of the grains, and the pH level of the near-surface volume of the corrosion solution on the corrosion process. In the study, sections of 2×1.5 mm were marked on the ZX10 alloy samples, for which maps of the distribution of crystallographic orientations and chemical composition were drawn. To assess the influence of the electrode potential of the particles, the authors carried out a Kelvin probe mapping in the 90×90 µm area. Next, corrosion tests were carried out with video filming of the surface on the marked area. To determine the pH level influence, the solution circulation in the cell was varied. Upon completion of the tests, corrosion products and corrosion damage were examined in detail. According to the results, the pH level in the liquid near-surface micro-volumes has a greater influence than the electrode potential of the particles as it provokes the formation of corrosion products of a different composition, which leads to passivation of the surface areas around the particles. The authors identified two different types of filiform corrosion. For filiform corrosion, a correlation between the corrosion direction and the crystallographic orientation of the grains was established.
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