Electrochemical Study of the AISI 409 Ferritic Stainless Steel: Passive Film Stability and Pitting Nucleation and Growth
AUTOR(ES)
Souza, Juliana Sarango de, Oliveira, Leandro Antônio de, Sayeg, Isaac Jamil, Antunes, Renato Altobelli
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
18/09/2017
RESUMO
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.
Documentos Relacionados
- Cathodic cage nitriding of AISI 409 ferritic stainless steel with the addition of CH4
- Influence of Nb Content on Sensitization and Pitting Corrosion of Welded AISI 430 Ferritic Stainless Steel
- Deformation induced martensite in an AISI 301LN stainless steel: characterization and influence on pitting corrosion resistance
- Chemical and electrochemical coloration of stainless steel and pitting corrosion resistance studies
- Comparative Study of Microstructure, Texture, and Formability Between 11CrTi and 11CrTi+Nb ASTM 409 Ferritic Stainless Steel