| SHI Xing-Iing,WANG Qing-liang,GE Shi-rong.Properties of Composite Ceramic Layer by Microarc Oxidation and Hydrothermal Treatment on Titanium Alloy[J],36(6):15-17,21 |
| Properties of Composite Ceramic Layer by Microarc Oxidation and Hydrothermal Treatment on Titanium Alloy |
| Received:July 13, 2007 Revised:December 10, 2007 |
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| DOI： |
| KeyWord:Titanium alloy Microarc oxidation Hydrothermal treatment HA layer Electrochemical corrosion |
| Author | Institution |
| SHI Xing-Iing |
College of Materials Science and Engineering, China University of Mining and Technology, Xuzhou , China |
| WANG Qing-liang |
College of Materials Science and Engineering, China University of Mining and Technology, Xuzhou , China |
| GE Shi-rong |
College of Materials Science and Engineering, China University of Mining and Technology, Xuzhou , China |
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| Abstract: |
| Hydrothermal treatment was carried out on Ti6A14V after microarc oxidation ( MAO) , resulting in a composite layer of Ti02 and HA. Composition, morphology and corrosion performance in Hanks'solution of the composite ceramic layer were characterized. The experimental results show that after hydrothermal treatment, the amorphous Ca, P in MAO layer precipitate into needle-like HA crystals by about 5 μm in thickness which show preferential growth on the edge and bottom of micro-holes in ceramic layer. Surface roughness changes obviously after hydrothermal treatment, and the micro-hardness reduces significantly by about l/3 in proportion. Electrochemical corrosion experimental results in SBF show that MAO improves the corrosion resistance of Ti6Al4V obviously. While Ecorr of sample after hydrothermal treatment is lower than that of untreated Ti6Al4V, the corrosion current in the range of body potential of 0. 4-0. 6V ( vs. SCE) is lower than that of the untreated one by one order of magnitude. |
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