Pitting Corrosion Behavior of UNS S31803 and UNS S32304 Duplex Stainless Steels in 3.5 wt% NaCl Solution

Lacerda, José Carlos de; Teixeira, Ricardo Luiz Perez; Souza, Rafaella Maria Ribeiro de; Soares, Renata Braga; Lins, Vanessa de Freitas Cunha

doi:10.1590/s1517-707620200002.1022

Cited by 6 publications

(2 citation statements)

References 21 publications

(28 reference statements)

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“…The addition of nickel (Ni) causes a change in the structure of the material and increases the range of the austenite phase. Nitrogen (N) is used in stainless steels to stabilize the austenitic phase and increase corrosion resistance [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Cardoso

Baptista

2022

Matéria (Rio J.)

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Duplex stainless steels are used to replace austenitic steels in industrial applications, especially in the chemical industry where corrosion resistance in chloride-containing media is an important requirement. According to literature, niobium has a great influence on the transformation of the phases of these steels (ferrite, austenite and sigma). Given the interest in evaluating this property in terms of wear resistance and corrosion of the material, the aim of this study was to evaluate the effect of niobium on the formation in austenitic-ferritic stainless steel SEW 410 Nr 1.4517 after heat treatment at 850ºC for 15, 30 and 60 minutes. The niobium contents studied were 0.2; 0.5 and 1.5 wt%. Measurements of microhardness, electrochemical tests in saline solution containing 3.5% sodium chloride and wear resistance were carried out. The results show that an increase in niobium content and sigma phase leads to an increase in hardness and wear resistance, associated with a decrease in corrosion potential. Therefore, the use of niobium in austeno-ferritic stainless steel is recommended when wear resistance is an important factor to be considered.

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Section: Introductionmentioning

confidence: 99%

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Cardoso

Baptista

2022

Matéria (Rio J.)

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“…On the other hand, at all pH levels examined, the pitting potential of the steels rose as the nitrogen content in them increased. Lacerda et al 20 used a cyclic potentiodynamic polarization technique to investigate the pitting corrosion behaviour of UNS S31803 and UNS S32304 duplex stainless steels in 3.5 wt% NaCl solution. In a 3.5 wt% NaCl solution, the two plates of steel investigated showed signs of pitting corrosion.…”

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confidence: 99%

Mechanical properties and corrosion behaviour of duplex stainless steel weldment using novel electrodes

Omiogbemi

Yawas

Das

et al. 2022

Sci Rep

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Mechanical and corrosion properties of welded duplex stainless steel (DSS) structures are of paramount consideration in many engineering applications. The current research investigates the mechanical properties and corrosion integrity of duplex stainless-steel weldment in a simulated 3.5% NaCl environment using specially developed novel electrodes without the addition of alloying elements to the flux samples. Two different types of fluxes having basicity indexes of 2.40 and 0.40 were used to coat E1 and E2 electrodes respectively for DSS plate welding. The thermal stability of the formulated flux was evaluated using thermogravimetric analysis. The chemical composition, using optical emission spectroscopy, and the mechanical and corrosion properties of the welded joints were evaluated as per different ASTM standards. X-ray diffraction was used to find out the phases present in the DSS welded joints while a scanning electron equipped with EDS was used for microstructural examination of the weldments. The ultimate tensile strength of welded joints made using the E1 electrode was in the range of 715–732 MPa and that of the E2 electrode was found to be 606–687 MPa. The hardness was increased with increased welding current from 90 to 110 A. The welded joint with E1 electrode coated with basic flux has better mechanical properties. The steel structure in 3.5% NaCl environment possesses substantial resistance to corrosion attack. This validates the performance of the welded joints made by the newly developed electrode. The results are discussed on the basis of the depletion of alloying elements such as Cr and Mo observed from the weldments with the coated electrodes E1 and E2 as well as precipitation of the Cr2N in the welded joints made by E1 and E2 electrodes.

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TRIP effect produced by cold rolling of austenitic stainless steel AISI 316L

Teixeira

Lacerda²,

Florencio³

et al. 2023

J Mater Sci

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Pitting Corrosion Behavior of UNS S31803 and UNS S32304 Duplex Stainless Steels in 3.5 wt% NaCl Solution

Cited by 6 publications

References 21 publications

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Laves phase precipitation and sigma phase transformation in a duplex stainless steel microalloyed with niobium.

Mechanical properties and corrosion behaviour of duplex stainless steel weldment using novel electrodes

TRIP effect produced by cold rolling of austenitic stainless steel AISI 316L

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