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EIS and XPS studies on passive film of AISI 304 stainless steel in dilute sulfuric acid solution
Author(s) -
Lai W. Y.,
Zhao W. Z.,
Yin Z. F.,
Zhang J.
Publication year - 2012
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3819
Subject(s) - sulfuric acid , x ray photoelectron spectroscopy , sulfide , materials science , metallurgy , sulfate , sulfite , galvanic cell , alloy , sulfur , polysulfide , pourbaix diagram , electrochemistry , inorganic chemistry , chemical engineering , chemistry , electrode , electrolyte , engineering
Electrochemical impedance spectroscopy and XPS studies on AISI 304 stainless steel in naturally aerated 0.5 M H 2 SO 4 solution were carried out at room temperature. The valuable model of the metal/solution interphase was established, and the reliable equivalent electrical circuits in the solution were presented. The analysis of the chemical composition of passive film on AISI 304 stainless steel was carried out by XPS. The passive film of AISI 304 stainless steel is composed of oxyhydroxides, Fe 2 O 3, FeO, Cr 2 O 3 , NiO, sulfate, sulfite, and sulfide (FeS, NiS). It is reported that the ferrous sulfide film formed on AISI 304 stainless steel in the dilute sulfuric acid solution. The possible process in which sulfuric acid is reduced to sulfite and sulfide is proposed. The galvanic interaction of sulfide inclusions with the base alloy is introduced. Copyright © 2011 John Wiley & Sons, Ltd.