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应用电化学阻抗技术并结合物相分析技术研究了合金元素Cr对Fe在 650℃ (Li,K) 2 CO3 共晶熔盐中的腐蚀行为的影响 .结果表明 ,加入 5 %和 1 0 %Cr不能改善Fe的耐腐蚀性能 ,而加入 2 0 %和 2 5 %Cr则能显著提高其耐腐蚀性能 ;Fe及Fe Cr合金腐蚀电化学阻抗谱呈双容抗弧特征 ,合金腐蚀受荷电粒子在氧化膜中的迁移控制 .提出将合金表面形成的氧化膜理想化为一电容器 ,并建立了氧化物电容与双电层电容相串联的等效电路来描述合金腐蚀的阻抗特征 .此外 ,根据所提等效电路对合金腐蚀电化学阻抗谱进行了解析 .
The effects of alloying elements Cr on the corrosion behavior of Fe in molten salt at 650 ℃ (Li, K) 2 CO3 were studied by electrochemical impedance spectroscopy and phase analysis techniques. The results show that adding 5% Cr and 10% Cr Can not improve the corrosion resistance of Fe, while adding 20% and 25% Cr can significantly improve its corrosion resistance; Fe and Fe Cr alloy corrosion electrochemical impedance spectroscopy showed double capacitive arc corrosion alloy corrosion by charged particles In the oxide film migration control proposed oxide film formed on the surface of the alloy idealized as a capacitor and established an equivalent circuit of the oxide capacitor and electric double layer capacitor to describe the resistance characteristics of alloy corrosion.In addition, Equivalent circuit is proposed to analyze the electrochemical corrosion resistance spectrum of alloy.