A PITTING MECHANISM FOR PASSIVE 304 STAINLESS-STEEL IN SULFURIC-ACID MEDIA CONTAINING CHLORIDE-IONS

Authors
ZHANG PQ WU JX ZHANG WQ LU XY WANG K
Citation
Pq. Zhang et al., A PITTING MECHANISM FOR PASSIVE 304 STAINLESS-STEEL IN SULFURIC-ACID MEDIA CONTAINING CHLORIDE-IONS, Corrosion science, 34(8), 1993, pp. 1343
Citations number
20
Categorie Soggetti
Metallurgy & Mining
Journal title
Corrosion science → ACNP
ISSN journal
0010938X
Volume
34
Issue
8
Year of publication
1993
Database
ISI
SICI code
0010-938X(1993)34:8<1343:APMFP3>2.0.ZU;2-H
Abstract
The pitting behavior of passive 304 stainless steel in 0.25 M Na2SO4 m edia 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 intermed iate complex (MOHCl)com will form in both the pit initiation and propa gation stages. The reaction mechanism models for pit initiation and pr opagation, and an equivalent circuit model to simulate the electrode i mpedance in pit propagation stage have been suggested. The factors whi ch control the pit growth kinetics have been discussed.