Electrochemical Study of the AISI 409 Ferritic Stainless Steel: Passive Film Stability and Pitting Nucleation and Growth

Electrochemical Study of the AISI 409 Ferritic Stainless Steel: Passive Film Stability and Pitting Nucleation and Growth

Author de Souza, Juliana Sarango Autor UNIFESP Google Scholar
de Oliveira, Leandro Antonio Google Scholar
Sayeg, Isaac Jamil Google Scholar
Antunes, Renato Altobelli Google Scholar
Abstract The aim of the present work was to study the passive film stability and pitting corrosion behavior of the AISI 409 stainless steel. The electrochemical tests were carried out in 0.1 M NaCl solution at room temperature. The general electrochemical behavior was assessed using electrochemical impedance spectroscopy (EIS) measurements whereas the semiconducting properties of the passive film were evaluated by the Mott-Schottky approach. Pitting corrosion was investigated using potentiodynamic and potentiostatic polarization tests. Surface morphology was examined using confocal laser scanning microscopy and scanning electron microscopy (SEM). Energy dispersive X-ray spectroscopy (EDS) analyses were carried out to identify the composition of precipitates that could act as preferential sites for the onset of pitting corrosion. The results showed that the passive film presents n-type semiconductive behavior. Grain boundaries played an important role as pitting initiation sites for the AISI 409 stainless steel.
Keywords stainless steel
pitting corrosion
passive film stability
AISI 409
xmlui.dri2xhtml.METS-1.0.item-coverage Sao Carlos
Language English
Sponsor Brazilian agency CAPES
Date 2017
Published in Materials Research-Ibero-American Journal Of Materials. Sao Carlos, v. 20, n. 6, p. 1669-1680, 2017.
ISSN 1516-1439 (Sherpa/Romeo, impact factor)
Publisher Univ Fed Sao Carlos, Dept Engenharia Materials
Extent 1669-1680
Origin http://dx.doi.org/10.1590/1980-5373-MR-2017-0204
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000415103400026
SciELO ID S1516-14392017000601669 (statistics in SciELO)
URI https://repositorio.unifesp.br/handle/11600/58267

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