Effects of applied voltage on the microstructure and properties of hydroxyapatite bioceramic coatings formed on Ti7Cu5Sn titanium alloy by micro-arc oxidation
| Autor: | L. C. Tsao |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Chemical Engineering Composite number Titanium alloy 02 engineering and technology General Chemistry Bioceramic 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences 0104 chemical sciences Corrosion visual_art visual_art.visual_art_medium General Materials Science Ceramic Amorphous calcium phosphate Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | Corrosion Engineering, Science and Technology. 53:582-590 |
| ISSN: | 1743-2782 1478-422X |
| DOI: | 10.1080/1478422x.2018.1513619 |
| Popis: | The effects of the applied voltage on the morphology, composition and corrosion behaviour of Ti7Cu5Sn coated were investigated. At applied voltages lower than 250 V, the composite coatings consist of anatase-TiO2, rutile-TiO2, DCPD(CaHPO4·2H2O) and a small amount of amorphous calcium phosphate phase. When the applied voltage is increased, the ceramic coatings transform from DCPD (CaHPO4·2H2O) to HA (Ca10(PO4)6(OH)2, 300 V), and new phases of Ca2P2O7, CaTiO3 and TCP(Ca3(PO4)2) form at 350 V. The passive current densities at body potential are one order of magnitude lower than that of the uncoated sample, indicating better corrosion resistance. The MAO film is a tri-layer system: a compact inner layer, a mesosphere porous oxide layer, and an outer layer. |
| Databáze: | OpenAIRE |
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