目的 研究Al6061-2%（质量分数）Ti3C2Tx复合材料在不同固溶温度下的微观组织、浸泡腐蚀和电化学腐蚀性能。方法 采用真空感应熔炼法制备复合材料,采用光学显微镜、扫描电镜、三维轮廓仪分析样品的显微组织、腐蚀形貌。采用电化学工作站测量动电位极化曲线和电化学阻抗谱,并分析其变化规律。结果 复合材料的腐蚀电位随固溶温度的升高呈现先正向移动后负向移动的趋势。经540 ℃固溶后,试样表现出最优的耐蚀性能,其腐蚀电位较未处理试样正向移动了43 mV,并具有最低的腐蚀电流密度（2.18 μA/cm2）。此外,电化学阻抗谱分析结果表明,固溶处理显著提高了复合材料的电荷转移电阻,经540 ℃固溶处理后,试样的电荷转移电阻Rct值达到15 024 Ω·cm2,较铸态试样提高了约2.4倍。结论 经540 ℃固溶处理后,复合材料中Mg2Si相的扩散系数显著增加并加速溶入基体中,提升了复合材料的耐腐蚀性能。
Abstract
The work aims to study the microstructure, immersion corrosion and electrochemical corrosion properties of Al6061-2 wt.% Ti3C2Tx composites at different solution treatment temperature. The composites were fabricated by vacuum induction melting, and the microstructure and corrosion morphology of the samples were analyzed by optical microscope, scanning electron microscope and three-dimensional profiler. In addition, dynamic potential polarization curves and electrochemical impedance spectra were measured with an electrochemical workstation, and their trend patterns were analyzed. The results showed that the corrosion potential of the composites showed a positive and then negative trend with the increase of solution temperature. Specimens subject to solution treatment at 540 ℃ exhibited optimal corrosion resistance, with a corrosion potential shifted positively by 43 mV compared with untreated specimens and had the lowest corrosion current density (2.18 μA/cm2). Furthermore, electrochemical impedance spectroscopy analysis indicates that solution treatment significantly improved the charge transfer resistance of the composites. After solution treatment at 540 ℃, the charge transfer resistance Rct reached 15 024 Ω·cm2, which was about 2.4 times higher than that of the as-cast specimens. The diffusion coefficient of the Mg2Si phases in the composites after solution treatment at 540 ℃ significantly increased, accelerating the dissolution of these phases into the matrix, which enhanced the corrosion resistance of the composites.
关键词
6061-Ti3C2Tx复合材料 /
真空感应熔炼 /
固溶处理 /
微观组织 /
耐腐蚀性能
Key words
6061-Ti3C2Tx composites /
vacuum induction melting /
solution treatment /
microstructure /
corrosion resistance.
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基金
江西省教育厅科技项目（GJJ2505204）; 国家自然科学基金（51965040）; 江西省交通运输厅科技项目（2022H0048）
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