目的 揭示SiC纤维增强相曝露对SiCf/Ti55531复合材料在海洋大气环境中耐蚀性的影响,为SiCf增强钛合金复合材料在海洋装备领域中的应用提供数据支撑。方法 基于电化学阻抗谱（EIS）方法,获得不同状态SiCf/Ti55531复合材料腐蚀过程中的EIS数据。采用欧姆电阻校正的方法,解析EIS数据的演化行为,运用等效电路模型和Voigt模型拟合EIS数据,阐明不同状态SiCf/Ti55531复合材料在腐蚀过程中的真实EIS特征和响应时间常数的物理来源。结果 对于完整的SiCf/Ti55531复合材料,测得的EIS响应来源于Ti55531合金基体表面的耐蚀氧化物膜层,其表面润湿时的低频阻抗模值|Z|0.01 Hz达106 Ω·cm2量级,耐蚀性较好;对于曝露的SiCf/Ti55531复合材料,其表面润湿时的|Z|0.01 Hz值在105 Ω·cm2量级,耐蚀性有所降低,但此时EIS响应仍来源于表面氧化物膜层,且膜层电阻随腐蚀过程进行没有呈现显著降低趋势。结论 SiCf增强相的曝露不会严重恶化SiCf/Ti55531复合材料的耐蚀性,这意味着即便SiCf/Ti55531复合材料遭到破坏,致使SiCf增强相曝露,其在海洋大气环境中仍具有较好且稳定的耐蚀性。
Abstract
The work aims to reveal the effect of SiC fiber exposure on the corrosion resistance evolution of SiCf/Ti55531 composite in marine atmosphere environment to provide data support for the application of SiCf reinforced titanium alloy composites in the field of marine equipment. The EIS data of SiCf/Ti55531 composites under different states during the corrosion process were obtained based on electrochemical impedance spectroscopy (EIS) test. The evolution behavior of EIS data was analyzed with Ohmic resistance correction method. The electrical equivalent circuit model and Voigt model were used to fit the EIS data, clarifying the physical source of the observed time-constants of the authentic-EIS characteristics during the corrosion process of SiCf/Ti55531 composites in different states. For the intact SiCf/Ti55531 composite without SiCf exposure, the measured EIS response came from the corrosion-resistant oxide film on the Ti55531 alloy substrate surface. The low-frequency impedance modulus |Z|0.01 Hz under wet surface condition was at the order of 106 Ω·cm2, indicating the good corrosion resistance of the composite. For the SiCf/Ti55531 composite with SiCf exposure, the observed |Z|0.01 Hz value under wet surface condition was at the order of 105 Ω·cm2, and the corrosion resistance was slightly reduced. However, the obtained EIS response, at this time, still came from the surface oxide film, and the film resistance did not show a significant decreasing trend over the corrosion duration. The SiCf exposure will not seriously deteriorate the corrosion resistance of SiCf/Ti55531 composite, which means that even if the SiCf/Ti55531 composite is damaged, causing SiCf exposure, it still has good and stable corrosion resistance in marine atmosphere environment.
关键词
钛合金 /
SiC纤维增强复合材料 /
氧化物膜层 /
海洋腐蚀 /
大气腐蚀 /
电化学阻抗谱
Key words
Ti alloy /
SiCf/Ti55531 composite /
oxide film /
marine corrosion /
atmospheric corrosion /
electrochemical impedance spectroscopy
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基金
国家自然科学基金（2401126）; 中国博士后面上基金（2025M770108）; 辽宁省面上基金（2024-MSBA-67）; 辽宁科技学院博士科研启动基金（1910B06）
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