A metasilicate-based ceramic coating formed on magnesium alloy by microarc oxidation and its corrosion in simulated body fluid
| Autor: | C.J. Wu, M.S. Jin, Yaming Wang, Daqing Wei, Y. Zhou, J.P. Zhuang, J.W. Guo, Z.K. Shao |
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| Rok vydání: | 2013 |
| Předmět: |
6111 aluminium alloy
Materials science Simulated body fluid Metallurgy Alloy Sodium silicate Surfaces and Interfaces General Chemistry engineering.material Condensed Matter Physics Surfaces Coatings and Films Corrosion chemistry.chemical_compound Coating chemistry Chemical engineering Materials Chemistry engineering 5052 aluminium alloy Magnesium alloy |
| Zdroj: | Surface and Coatings Technology. 219:8-14 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2012.12.040 |
| Popis: | We report a strategy to prepare biocompatible metasilicate-based ceramic coatings by microarc oxidation (MAO) on AZ91D magnesium alloy in sodium silicate solution with Ca(H 2 PO 4 ) 2 additive. X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used to assess the phase composition and microstructure of the coatings. The corrosion behavior of the coated samples was evaluated by electrochemical and immersion tests in simulated body fluid (SBF). The results show that the corrosion resistance of AZ91D alloy is significantly improved due to the formation of dense coatings with biocompatible CaSiO 3 , CaMgSiO 4 and Mg 2 SiO 4 phases. Increasing Ca(H 2 PO 4 ) 2 content in the based sodium silicate leads to better corrosion resistance of AZ91D alloy. The results suggested a promising method for surface modification of degradable magnesium alloy as biomedical applications. |
| Databáze: | OpenAIRE |
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