Effect of Thermal Oxidation on the Wear andCorrosion Behavior of Ti-6Al-4V Alloy in aSimulated Body Solution

• Main Authors: Yu-Liang Hsu, 徐裕量
• Other Authors: 李正國
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/04992714147178992987

碩士 === 健行科技大學 === 機械工程系碩士班 === 104 === The thesis to the Ti6Al4V alloy surface, at different temperatures and times after thermal oxidation treatment, and then allowed to stand calcium phosphate solution, analysis of different coating structure and hardness, and corrosion and wear corrosion resistance in a simulated body solution. After Ti6Al4V alloy used in the experiment and performed thermal oxidation treatment at different temperatures (650˚C, 750˚C, 850˚C) and at different times (1h, 7h, 24h), then after standing calcium phosphate solution (30day). And measured the hardness of the formed coatings, using electrochemical corrosion test to analyze corrosion resistance, further using the Block-on-ring friction manner with sintered alumina (Al₂O?) ceramic ring for wear corrosion resistance analysis, and finally with a scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS), analysis of surface coating morphology and elemental composition before and after corrosion and wear corrosion testing. Experimental results show that the alloy Ti6Al4V after the thermal oxidation treatment at different temperatures and at different times, and immersed in calcium phosphate solution, the formed coatings have a higher hardness values, but also reduces the passive corrosion protection of the alloy. While the substrate after the thermal oxidation treatment at 650 ˚C 24h, the formed oxidation layer will increase calcium phosphate coating to more dense and its deposition efficiency, thus increasing the corrosion resistance. Furthermore, all the formed coatings on the thermal oxidation substrate have a beneficent enhance to the wear corrosion resistance of Ti6Al4V alloy, especially formed at 650 ˚C 24h oxide substrate.