通过通过等离子电解氧化进行表面处理来改善可生物降解的Mg-Zn(-Ca) 合金
Jakub Vertaľ1, Daniel Kajánek2, Jiří Kubásek3
1Charles University, Department of Physics of Materials, Ke Karlovu 5, 121 16 Prague, Czech Republic.
Materials (Basel, Switzerland)
|February 26, 2025
概括
优化血电解氧化 (PEO) 准备时间可以提高合金的耐腐蚀性. 10分钟的PEO处理为Mg-Zn和Mg-Zn-Ca合金提供了最佳的降解抵抗力.
科学领域:
- 材料科学 材料科学 材料科学
- 腐蚀工程 腐蚀工程
- 生物材料是一种生物材料.
背景情况:
- 合金为生物医学应用提供了出色的生物相容性和生物降解性.
- 提高合金的耐腐蚀性对于其临床成功至关重要.
- 血电解氧化 (PEO) 是一种有前途的表面处理方法,用于提高合金的性能.
研究的目的:
- 为了研究血电解氧化 (PEO) 准备时间对Mg-1Zn (Z1) 和Mg-1Zn-0.4Ca (ZX10) 合金的降解抵抗的影响.
- 为了比较PEO处理的Z1和ZX10合金与纯Mg和WE43合金的耐腐蚀性.
- 确定最佳的PEO制备时间,以最大限度地提高低合金的耐腐蚀性.
主要方法:
- 对Z1,ZX10,纯Mg和WE43合金进行了PEO处理,持续时间不同 (5,10分钟和15分钟).
- 分析了PEO层的微观结构,形态和耐腐蚀性.
- 在0.9%的NaCl腐蚀介质中评估了降解耐受性.
主要成果:
- 经过10分钟的准备时间形成的PEO层表现出最均的结构和优越的耐腐蚀性.
- 增加PEO准备时间 (15分钟) 导致较高的孔密度,裂形成和层厚,促进降解.
- 来自PEO层的酸盐溶解为保护性腐蚀层做出了贡献,增强了长期耐腐蚀性.
结论:
- 合金的PEO制备时间显著影响合金的微观结构和耐腐蚀性.
- 10分钟的PEO处理是达到Mg-Zn(-Ca) 合金中增强降解耐性的最佳方法.
- 用PEO处理的生物相容Mg-Zn(-Ca) 合金可以达到与高性能WE43合金相比的耐腐蚀性.
更多相关视频
相关概念视频
Common Ion Effect
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
Factors Affecting Solubility
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
Extraction: Advanced Methods
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Microbial Leaching
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...


