Effect of calcium content on the microstructure, hardness and in-vitro corrosion behavior of biodegradable Mg-Ca binary alloy

Materials Research

Shervin Eslami Harandi²  Mohammad Mirshahi²  Shahriar Koleini²  Mohd Hasbullah Idris²  Hassan Jafari²  Mohammed Rafiq Abdul Kadir¹ 

[1] ,Universiti Teknologi Malaysia Faculty of Mechanical Engineering Department of Materials EngineeringSkudai Johor ,Malaysia

关键词: magnesium alloys;    biomaterials;    SBF;    microstructure;    corrosion;    hardness;   

DOI  :  10.1590/S1516-14392012005000151

来源: SciELO

【 摘 要 】

Effect of calcium addition on microstructure, hardness value and corrosion behavior of five different Mg-xCa binary alloys (x = 0.7, 1, 2, 3, 4 wt. (%)) was investigated. Notable refinement in microstructure of the alloy occurred with increasing calcium content. In addition, more uniform distribution of Mg2Ca phase was observed in a-Mg matrix resulted in an increase in hardness value. The in-vitro corrosion examination using Kokubo simulated body fluid showed that the addition of calcium shifted the fluid pH value to a higher level similar to those found in pure commercial Mg. The high pH value amplified the formation and growth of bone-like apatite. Higher percentage of Ca resulted in needle-shaped growth of the apatite. Electrochemical measurements in the same solution revealed that increasing Ca content led to higher corrosion rates due to the formation of more cathodic Mg2Ca precipitate in the microstructure. The results therefore suggested that Mg-0.7Ca with the minimum amount of Mg2Ca is a good candidate for bio-implant applications.

【 授权许可】

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