| 摘要: |
| 石墨烯增强钛基纳米复合材料，因其良好的力学性能有望成为轻质高强结构材料。为了研究其硬度和耐腐蚀性能，在AISI 4140 合金结构钢的基板上采用激光烧结的方法制备了石墨烯钛纳米复合材料。采用扫描电子显微镜、X射线衍射仪、显微硬度计、拉曼光谱仪等研究了其微观结构、相组成和显微硬度等，并采用电化学极化法研究了激光烧结石墨烯钛纳米复合材料和纯钛在3.5%NaCl溶液中的腐蚀行为。结果表明：激光烧结后石墨烯存在并均匀分散于钛基纳米复合材料中，石墨烯的添加使得钛基纳米复合材料的显微硬度达到了450 HV0.2，与激光烧结纯钛（180 HV0.2）相比提高了1.5倍。石墨烯钛纳米复合材料的腐蚀电位比激光烧结纯钛的腐蚀电位有明显提高，从-0.64 V提高到-0.59 V；同时，腐蚀电流从1.6×107 A/cm2降低到7×108 A/cm2，说明其耐腐蚀性能优于激光烧结纯钛。 |
| 关键词: 激光烧结 纳米复合材料 石墨烯 钛 耐腐蚀性 |
| DOI：10.11933/j.issn.1007-9289.2015.06.017 |
| 分类号: |
| 基金项目: |
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| Corrosion Behavior of Laser Sintered Graphene Reinforced Titanium Matrix Nanocomposites |
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HU Zengrong, TONG Guoquan, ZHANG Chao, CHEN Changjun, ZHANG Min, GUO Huafeng1,2,3,4
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1. Soochow University;2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics;3. Jiangsu Provincial Key Laboratory for Science and Technology of Photon Manufacturing, Jiangsu University;4. School of Materials and Metallurgy, Wuhan University of Science and Technology
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| Abstract: |
| Graphene reinforced titanium nanocomposites (GrTi) are expected to become light weight and high strength structural material for its excellent mechanical properties.To study its hardness and corrosion properties, the GrTi was prepared on AISI 4140 substrate though a laser sintering process. The microstructures, components and hardness were analysed by SEM, XRD and Raman spectroscopy. The corrosion behavior of laser sintered pure titanium and GrTi in 3.5% NaCl solution was studied by electrochemical polarization method. The results show that the graphene disperses and survivals in the titanium matrix. The hardness of the GrTi is 450 HV0.2, while that of the laser sintered pure titanium is 180 HV0.2, which increasing 150%. And the corrosion potential and corrosion current of the GrTi are -0.64 V and 1.6×107 A/cm2, and that of the pure titanium just -0.59 V and 7×108 A/cm2, which means that the corrosion resistance of the GrTi is better than that of pure titanium. |
| Key words: laser sintering nanocomposites graphene titanium corrosion resistance |
