Evaluation of pitting corrosion by means of dynamic electrochemical impedance spectroscopy
Evaluation of pitting corrosion by means of dynamic electrochemical impedance spectroscopy
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DOI：
10.1016/j.electacta.2004.01.070
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发表时间：
2004-07
影响因子：
6.6
通讯作者：
K. Darowicki;S. Krakowiak;P. Ślepski
中科院分区：
文献类型：
--
作者：
K. Darowicki;S. Krakowiak;P. Ślepski
用线性电位变化下的电化学阻抗谱（EIS）研究了304L不锈钢在0.5MNaCl溶液中的点蚀行为。一般的电气等效电路已被确定在一个广泛的潜力，涵盖了被动状态，亚稳态发展的坑和自发坑的形成。它已被证明，在动电位条件下的阻抗测量允许同时调查的钝化层结构，通过钝化层和电极过程动力学内的坑的离子传输过程中的变化。已经指出，亚稳范围内的点蚀是活化控制的。在自发孔发展的电位范围内，孔内的电极过程也受到活化控制。
Pitting corrosion investigations of 304L stainless steel in 0.5M NaCl have been performed by means of electrochemical impedance spectroscopy (EIS) under linear potential change conditions. The general electric equivalent circuit has been determined in a wide range of potentials, covering the passive state, the metastable development of pits and spontaneous pit formation. It has been shown that impedance measurements in potentiodynamic conditions allow simultaneous investigation of changes in the passive layer structure, ion transport processes through the passive layer and electrode process kinetics inside the pits. It has been stated that pitting corrosion in the metastable range is activation controlled. In the potential range of the spontaneous pit development electrode processes inside the pits are also activation controlled.