快速傅里叶变换
介电谱
欧姆接触
时域
频域
极化(电化学)
腐蚀
材料科学
电容
电阻抗
摄动(天文学)
双层电容
分析化学(期刊)
电化学
电子工程
数学
化学
数学分析
冶金
计算机科学
电极
物理
电气工程
复合材料
算法
工程类
色谱法
物理化学
量子力学
计算机视觉
图层(电子)
作者
Shuangyu Cai,Lei Wen,Xiuquan Yao,Feifei Huang,Zhigang Yu,Ying Jin
标识
DOI:10.1149/1945-7111/abe0d3
摘要
Traditional micro-electrochemical impedance spectroscopy measurement using a capillary cell presents problems such as high ohmic resistance, long test duration and the subsequent possible tip blocking by corrosion products. In comparison, coulostatic perturbation measurements can avoid these issues due to its unique test principle and much shorter test duration. In this work, the coulostatic perturbation tests were performed on microregions of duplex stainless steel (DSS) 2205 immersed in 3.5 wt.% NaCl solution. The micro-electrochemical parameters were estimated by linear fitting the time-domain curve (LFTC), and subsequently by fitting the frequency-domain curve (FFC) obtained through Fast Fourier Transform (FFC-FFT) for comparison. It is shown that FFC-FFT method minimizes the problem of manual error in slope and intercept evaluation during LFTC. In comparison to the traditional EIS tests, FFC-FFT method causes less perturbation to the tested system, less interference of ohmic resistance with shorter test duration, thus can obtain valid low frequency data more efficiently, which is particularly favorable in studying high polarization resistance system or unstable systems. The micro-electrochemical experimental tests of DSS 2205 show that the polarization resistance of the microregion gradually increases with the increase of austenite phase, while the double-layer capacitance shows a decreasing trend.
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