Biodegradation Behavior of Coated As-Extruded Mg–Sr Alloy in Simulated Body Fluid

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 i...

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Bibliographic Details
Published in:Acta metallurgica sinica : English letters 2019-10, Vol.32 (10), p.1195-1206
Main Authors: Zhao, Ming-Chun, Zhao, Ying-Chao, Yin, Deng-Feng, Wang, Shuo, Shangguan, Yong-Ming, Liu, Chao, Tan, Li-Li, Shuai, Ci-Jun, Yang, Ke, Atrens, Andrej
Format: Article
Language:English
Subjects:
Alloys
Biocompatibility
Biodegradation
Biomedical materials
Body fluids
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Corrosion rate
Corrosion resistance
Corrosion resistant alloys
Electrodes
Extrusion coating
Extrusion rate
Grain boundaries
Grain size
Magnesium base alloys
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nanotechnology
Organometallic Chemistry
Oxidation resistance
Protective coatings
Skin & tissue grafts
Spectroscopy/Spectrometry
Spectrum analysis
Strontium
Substrates
Tribology
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Summary: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.
ISSN:1006-7191
2194-1289
DOI:10.1007/s40195-019-00892-5