Effect of the second-step voltages on the structural and corrosion properties of silicon–calcium–phosphate (Si–CaP) coatings on Mg–Zn–Ca alloy
| Autor: | Lu Lu, Yupeng Zhao, Chuanzhong Chen, Guochao Gu, Huijun Yu, Jinhe Dou |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Simulated body fluid Alloy chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 01 natural sciences corrosion behaviour Corrosion Coating Magnesium alloy lcsh:Science second step Multidisciplinary Magnesium si–cap coating magnesium alloy 021001 nanoscience & nanotechnology Haemolysis Microstructure 0104 chemical sciences Chemistry micro-arc oxidation chemistry engineering lcsh:Q 0210 nano-technology Nuclear chemistry Research Article |
| Zdroj: | Royal Society Open Science, Vol 5, Iss 10 (2018) Royal Society Open Science |
| ISSN: | 2054-5703 |
| DOI: | 10.1098/rsos.172410 |
| Popis: | The applications of magnesium (Mg) alloys as biodegradable orthopedic implants are mainly restricted due to their rapid degradation rate in the physiological environment. In this study, Si–CaP micro-arc oxidation (MAO) coatings were prepared on a Mg–Zn–Ca alloy by a second-step MAO process at different voltages in order to decrease the degradation rate and increase the bioactivity of the alloy. The microstructure and morphology of the samples were characterized using XRD, FT-IR SEM and EDS. The degradation behaviours of samples were evaluated using electrochemical techniques, and immersion tests in simulated body fluid (SBF). The results indicate that the morphology of the Si–CaP coatings changed significantly with the increase in Ca/P ratio as the second-step voltage increased. The Si–CaP containing coating produced at 450 V could significantly decrease the degradation rate of Mg and caused a slow increase in pH of the SBF solution. The haemolysis test concluded that the coating C3 did not cause a haemolytic reaction. The corrosion resistance of Mg alloy was greatly improved with the Si–CaP coatings, and the Mg alloy with Si–CaP coating prepared at 450 V had the best corrosion resistance, which indicates that the Si–CaP coatings are promising for improving the biodegradation properties of Mg-based orthopedic implants. Haemolysis tests indicated that the Si–CaP coating prepared at 450 V conforms to the given standard (YY/T0127.1-93). |
| Databáze: | OpenAIRE |
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