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Electrochemical corrosion behavior of AZ91D magnesium alloy-graphene nanoplatelets composites in simulated body fluids
Journal of Materials Research and Technology ( IF 6.4 ) Pub Date : 2023-03-08 , DOI: 10.1016/j.jmrt.2023.01.232
Limin Li, Zhiquan Huang, Liwen Chen, Lulu Zhang, Muxi Li, Hua Hou, Yuhong Zhao

Magnesium-based materials have received extensive attention as biomedical implant materials due to their good mechanical properties and ability to degrade naturally in vivo. However, the limitation of magnesium-based materials in medical applications is that the corrosion rate is too rapid to maintain the mechanical integrity of implants during bone healing. The electrochemical corrosion behavior of AZ91D magnesium alloy-graphene nanoplatelets (AZ91D-GNPs) composites in simulated body fluid (SBF) solution was investigated. The corrosion behavior was characterized by microscopic observation, dynamic potential polarization and Nyquist diagram. The influence of different GNPs content and different heat treatment on the corrosion behavior of AZ91D magnesium alloy was determined. The results show that the corrosion resistance of AZ91D-GNPs composites is the highest when the content of GNPs is 0.6 wt%, and the corrosion rate is 2.7549 mm/a. In addition, after solution treatment, the corrosion rate is 0.5179 mm/a, which is reduced by 81%. Solution treatment can effectively improve the corrosion resistance of AZ91D-GNPs composites.



中文翻译:

AZ91D镁合金-石墨烯纳米片复合材料在模拟体液中的电化学腐蚀行为

镁基材料作为生物医学植入材料由于其良好的机械性能和在体内自然降解的能力而受到广泛关注。然而,镁基材料在医疗应用中的局限性在于腐蚀速度太快,无法在骨愈合过程中保持植入物的机械完整性。研究了 AZ91D 镁合金-石墨烯纳米片 (AZ91D-GNPs) 复合材料在模拟体液 (SBF) 溶液中的电化学腐蚀行为。通过显微观察、动态电位极化和奈奎斯特图表征腐蚀行为。测定了不同GNPs含量和不同热处理对AZ91D镁合金腐蚀行为的影响。结果表明,当GNPs含量为0.6 wt%时,AZ91D-GNPs复合材料的耐蚀性最高,腐蚀速率为2.7549 mm/a。此外,经过固溶处理后,腐蚀速率为0.5179 mm/a,降低了81%。固溶处理可以有效提高AZ91D-GNPs复合材料的耐腐蚀性能。

更新日期:2023-03-08
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