摘要
采用电化学阻抗谱技术研究了Cu在650℃熔融（Li，K）2CO3中的腐蚀行为．在腐蚀初期，Cu的腐蚀电化学阻抗谱呈典型的腐蚀反应受氧化剂粒子扩散控制的特征；随着腐蚀的进行，在Cu的表面逐渐形成了Cu2O膜．但同时，生成的Cu2O也发生溶解，使Cu局部遭受较快腐蚀，其电化学阻抗增呈双容抗孤特征．提出了相应的等效电路，并求取了相关电化学参数．
Electrochemical impedance spectrum was employed to study the hot corrosion of Cu inthe molten (Li,K)2CO3 at 650 ℃. The electrochemical impedance spectra for the corrosion of Cu duringthe initial immersion time have the characteristics of diffusion-controlled reaction. A scale of Cu2O grew onCu with time. Meanwhile, the formed Cu2O was dissolved in the molten salts, giving rise to the localizedfast corrosion of Cu. Accordingly, the electrochemical impedance spectra are composed of two capacitanceloops. The equlvalent circuits representing the impedance spectra were proposed, and some electrochemicalparameters were also calculated.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第6期623-626,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金!59401012
关键词
热腐蚀
电化学阻抗谱
铜
碳酸钾
碳酸锂
copper, (Li,K)2CO3, hot corrosion, electrochemical impedance spectrum
