Biodegradation Behavior of Coated As-Extruded Mg–Sr Alloy in Simulated Body Fluid
来源期刊：Acta Metallurgica Sinica2019年第10期
论文作者：Ming-Chun Zhao Ying-Chao Zhao Deng-Feng Yin Shuo Wang Yong-Ming Shangguan Chao Liu Li-Li Tan Ci-Jun Shuai Ke Yang Andrej Atrens
文章页码：1195 - 1206
摘 要：As-extruded Mg–Sr alloy, a kind of promising biodegradable biomedical material, was coated using micro-arc oxidation and also using a phosphate conversion coating. The corrosion behaviors were investigated using Hanks’ solution. The corrosion of the as-extruded Mg–Sr alloy became more serious with increasing immersion time; that is, the corrosion pits became more numerous, larger and deeper. The micro-arc oxidation coating and the phosphate conversion coating were effective in improving the corrosion resistance of the as-extruded Mg–Sr alloy. The micro-arc oxidation coating was much more effective. Moreover, the as-extruded Mg–Sr alloy and the coated as-extruded Mg–Sr alloy exhibited lower corrosion rates than the as-cast Mg–Sr alloy and the corresponding coated as-cast Mg–Sr alloy, indicating that the corrosion properties of the coated samples are dependent on their substrates. The finer microstructure of the substrate of the as-extruded condition corroded much slower. The corrosion resistance of the coated Mg–Sr alloy depended on the coating itself and on the microstructure of the substrate.
Ming-Chun Zhao1，Ying-Chao Zhao1，Deng-Feng Yin1，Shuo Wang1，Yong-Ming Shangguan2，Chao Liu1，Li-Li Tan2，Ci-Jun Shuai1，Ke Yang2，Andrej Atrens3
1. School of Materials Science and Engineering,Central South University2. Institute of Metal Research,Chinese Academy of Sciences3. Division of Materials,The University of Queensland
摘 要：As-extruded Mg–Sr alloy, a kind of promising biodegradable biomedical material, was coated using micro-arc oxidation and also using a phosphate conversion coating. The corrosion behaviors were investigated using Hanks’ solution. The corrosion of the as-extruded Mg–Sr alloy became more serious with increasing immersion time; that is, the corrosion pits became more numerous, larger and deeper. The micro-arc oxidation coating and the phosphate conversion coating were effective in improving the corrosion resistance of the as-extruded Mg–Sr alloy. The micro-arc oxidation coating was much more effective. Moreover, the as-extruded Mg–Sr alloy and the coated as-extruded Mg–Sr alloy exhibited lower corrosion rates than the as-cast Mg–Sr alloy and the corresponding coated as-cast Mg–Sr alloy, indicating that the corrosion properties of the coated samples are dependent on their substrates. The finer microstructure of the substrate of the as-extruded condition corroded much slower. The corrosion resistance of the coated Mg–Sr alloy depended on the coating itself and on the microstructure of the substrate.
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