304 Stainless Steel Pitting Behavior by Means of Electrochemical Impedance Spectroscopy
DU Nan, YE Chao, TIAN Wen-ming, ZHAO Qing
National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology Institute, Nanchang Hangkong University, Nanchang 330063, China
Abstract：Pitting behavior of 304 stainless steel in 3.5% (mass fraction) NaCl solution was investigated by dynamic potential electrochemical impedance spectroscopy (DEIS) and time scan electrochemical impedance spectroscopy (TSEIS). The results of DEIS show that metastable pits emerge at the potential (0.02V) which is more negative than the pitting potential (0.15V), and the generation and passivation of metastable pits are stochastic. The steady pitting potential which got from DEIS is negative than breakdown potential which got from dynamic potential polarization by 0.05V. The results of TSEIS indicate that pitting nucleation can happen just when the thickness of passivation film has been reduced to some extent. It reveals the characteristics of the structure of electric double layer and passivation film by analyzing element parameter of the equivalent circuit.
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