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Article

The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods

1
Graduate Program in Mechanical Engineering, Federal University of Paraíba, João Pessoa 58051-900, Brazil
2
Graduate Program in Materials Science and Engineering, Federal University of Rio Grande do Norte, Natal 59078-970, Brazil
3
Graduate Program in Materials Science and Engineering, Federal University of Paraíba, João Pessoa 58051-900, Brazil
4
Center for Science and Technology in Energy and Sustainability, Federal University of Recôncavo da Bahia, Feira de Santana 44042-280, Brazil
*
Author to whom correspondence should be addressed.
Materials 2020, 13(23), 5511; https://doi.org/10.3390/ma13235511
Received: 1 November 2020 / Revised: 20 November 2020 / Accepted: 22 November 2020 / Published: 3 December 2020
(This article belongs to the Special Issue Corrosion and Corrosion Inhibition of Metals and Their Alloys)
This work reports the effects of microstructural changes due to the secondary phases, in particular sigma (σ), on the mechanical properties and electrochemical behavior of thermally aged duplex stainless steel (DSS). Structural, morphological, mechanical, and electrochemical characterizations were performed. Sigma phase content increased with increasing aging treatment time. It had a net-like shape, as observed by electron backscatter diffractometry (EBSD). Its presence directly damaged mechanical properties. The corrosion assessment included electrochemical impedance spectroscopy (EIS) in 1 M NaCl solution at temperatures of 25, 40, and 65 °C. EIS results demonstrate that an increase in the σ phase content decreased the corrosion resistance (21.1–0.8, 3.5–0.3, and 3.1–0.2 kΩ cm2 at 25, 40, and 60 °C, respectively). View Full-Text
Keywords: duplex stainless steel; sigma phase; electron backscatter diffractometry; mechanical properties; corrosion; electrochemical impedance spectroscopy duplex stainless steel; sigma phase; electron backscatter diffractometry; mechanical properties; corrosion; electrochemical impedance spectroscopy
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MDPI and ACS Style

Silva, D.D.S.; Lima, L.S.D.C.; Araújo, A.J.M.; Silva, V.D.; Raimundo, R.A.; Damasceno, I.Z.; Simões, T.A.; Gomes, R.M. The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods. Materials 2020, 13, 5511. https://doi.org/10.3390/ma13235511

AMA Style

Silva DDS, Lima LSDC, Araújo AJM, Silva VD, Raimundo RA, Damasceno IZ, Simões TA, Gomes RM. The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods. Materials. 2020; 13(23):5511. https://doi.org/10.3390/ma13235511

Chicago/Turabian Style

Silva, David D.S., Lindolpho S.D.C. Lima, Allan J.M. Araújo, Vinícius D. Silva, Rafael A. Raimundo, Igor Z. Damasceno, Thiago A. Simões, and Rodinei M. Gomes. 2020. "The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods" Materials 13, no. 23: 5511. https://doi.org/10.3390/ma13235511

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