1. A pitting mechanism for passive 304 stainless steel in sulphuric acid media containing chloride ions
- Author
-
Xiang-An Lu, P.Q. Zhang, Ke Wang, J.X. Wu, and Wenhua Zhang
- Subjects
Reaction mechanism ,Materials science ,Growth kinetics ,General Chemical Engineering ,Metallurgy ,Inorganic chemistry ,Impedance spectrum ,General Chemistry ,Electrode impedance ,Chloride ,Ion ,Corrosion ,medicine ,Equivalent circuit ,General Materials Science ,medicine.drug - Abstract
The pitting behavior of passive 304 stainless steel in 0.25 M Na 2 SO 4 media of pH 1 containing chloride ions of different concentrations has been investigated using EIS technique. The characteristics of measured impedance spectra have been analysed. It is proposed that an intermediate complex (MOHCl)com will form in both the pit initiation and propagation stages. The reaction mechanism models for pit initiation and propagation, and an equivalent circuit model to simulate the electrode impedance in pit propagation stage have been suggested. The factors which control the pit growth kinetics have been discussed.
- Published
- 1993
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