Please use this identifier to cite or link to this item: https://repositorio.fei.edu.br/handle/FEI/3415
Title: Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels.
Authors: SANTOS, DANIELA CALUSCIO DOS
MACARRÃO, ISABELLE MONFRINATTI
Rodrigo Magnabosco
Issue Date: 12-Dec-2019
Abstract: This work aims to investigate the relation between PREN of ferrite and austenite and the pitting potential of UNS S31803 DSS. Samples were solution-treated between 1040 °C and 1150 °C generating different phase fractions and, consequently, different alloy element contents. ThermoCalc® thermodynamic simulations were performed to predict the chemical composition of each phase allowing the PREN calculations. Besides, potentiodynamic polarization tests were conducted in 0.6M NaCl solution at 70 °C to correlate pitting potential (Epit) and PREN. Thermodynamic simulation reveals that PREN for ferrite is higher than austenite between 975 °C and 1300 °C. Nevertheless, the electrochemical results show a slight reduction of pitting potential with increasing ferrite content, probably related to the reduction of Cr and Mo contents in this phase. Pits were found preferably in ferrite and in ferrite/austenite interfaces. This behavior suggests that, even with only a slight reduction of pitting potential and, consequently, a discrete corrosion resistance reduction, ferrite is more susceptible to pitting. No pits were found in austenite, suggesting that higher N contents are fundamental to maintain the corrosion resistance of this phase.
Keywords: duplex
pitting
polarization
PREN
Journal: Berg Huettenmaenn Monatsh
ISSN: 1613-7531
Citation: SANTOS, D.C; MACARRAO, I. M.; MAGNABOSCO, R. Relation between pitting potential and PREN values for ferrite and austenite in duplex stainless steels. Berg Huettenmaenn Monatsh, v. 165, n. 1, p. 46-50, 2019.
Access Type: Acesso Restrito
DOI: 10.1007/s00501-019-00925-7
URI: https://repositorio.fei.edu.br/handle/FEI/3415
Appears in Collections:Artigos

Files in This Item:
File Description SizeFormat 
Magnabosco_pdf1.11 MBAdobe PDFThumbnail
View/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.