| 摘要: |
| 基于感应加热双脉冲气体渗碳技术对 TC6 合金进行表面强化,利用 XRD 和金相显微镜研究了渗碳层的微观结构;采用自制腐蚀磨损试验机研究了渗碳件在 0. 1%HF 溶液、0. 9%NaCl 溶液和 SBF 溶液中的腐蚀磨损性能,利用电化学工作站测试了其在腐蚀和腐蚀磨损交互作用下开路电位和极化曲线的变化,并利用白光干涉仪对磨痕形貌进行表征与分析。 结果表明: 经 910 ℃渗碳后 TC6 合金形成富 TiC 强化层,硬度达 850 HV0.25 ,在 3 种不同介质中均表现出较小的摩擦因数和磨损率。 摩擦状态下渗碳样在 SBF 溶液中腐蚀电流密度最小(9. 64×10-6A/ cm2),表现出良好的耐生物腐蚀特性,而在 0. 1% HF 溶液中腐蚀电流密度最大(1. 34×10-4A/ cm2);在 3 种不同介质环境中原样均以粘着磨损为主,而渗碳后的 TC6 合金主要表现为磨粒磨损,腐蚀对磨损的促进作用是造成 TC6 合金损耗的主要因素。 |
| 关键词: TC6 感应渗碳 腐蚀磨损 协同效应 |
| DOI：10.11933/j.issn.1007-9289.20190906001 |
| 分类号:TG156.81;TG178 |
| 文章编号:1007-9289(2020)02-0047-10 |
| 文献标识码:A |
| 基金项目:贵州省科学技术基金([2020]1Z041, [2017]5607)； 国家科学自然基金(51574096) |
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| Corrosion and Wear Properties of Carburized Layer on TC6 Titanium Alloy in Different Environments |
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Dai Yan1, Wu Xuan1, Yang Feng1, Li Kunmao2, Liu Jing1, Ou Meigui2
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1.School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550001 , China;2.College of Mate- rials and Metallurgy, Guizhou University, Guiyang 550003 , China
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| Abstract: |
| Surface strengthening of TC6 alloy was conducted by using the induction heating double pulse gas carburizing tech- nology. The microstructures of these carburized layer were characterized by using XRD and metallographic microscope. The cor- rosion and wear properties of carburizing samples were studied in 0. 1% HF solution, 0. 9% NaCl solution and SBF solution by u- sing a home-made corrosion-wear test device. Meanwhile, the open circuit potential and polarization curves under the interaction of corrosion and wear were measured by an electrochemical workstation. The worn surfaces were characterized and analyzed by the white light interferometer. Results show that a TiC layer is formed on TC6 alloy by carburizing at 910℃ and the layer has the hardness of 850 HV0.25 . Both the friction coefficient and wear rate of the alloy after carburizing are smaller than that of the bare alloy in three different media. The smallest corrosion current density (9. 64×10-6A/ cm-2) of the carburized sample is obtained in the SBF solution by the corrosion-wear test, indicating an excellent resistance to biological corrosion. Noting that the biggest corrosion current density is found in 0. 1%HF solution (1. 34×10-4A/ cm-2), the wear mechanism of the bare alloy is mainly adhesive wear and the carburized TC6 alloy is mainly abrasive wear in all three environments. Overall, corrosion can enhance the wear of the alloy and such enhancement leads to material loss of TC6 alloy. |
| Key words: TC6 induction carburizing corrosion wear synergistic effect |
