Reduction of austenite-ferrite galvanic activity in the heat-affected zone of a Gleeble-simulated grade 2205 duplex stainless steel weld

Reccagni, Pierfranco; Guilherme, Luis Henrique; Lu, Qing Hua; Gittos, M. F.; Engelberg, Dirk

doi:10.1016/j.corsci.2019.108198

Cited by 43 publications

(17 citation statements)

References 19 publications

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“…The environment containing 2 mol L -1 H 2 SO 4 + 0.5 mol L -1 HCl in Figure 9 enhanced the anodic current density in the active-to-passive transition region, and it is important to point out that two distinguishable peaks were observed in this region, consistent with those reported by other authors 29,35 . According to the literature 27 , preferential dissolution of ferrite phase occurred at lower peak potential (≈ -270 mV to the base metal), while the austenite phase corroded at a fast rate at higher peak potential (≈ -220 mV to the base metal).…”

Section: Ferrite/austenite -Electrochemical Activitysupporting

confidence: 89%

“…This would certainly mean that ferrite stabilising elements are partly re-distributed into the austenite, which in turn would also affect the corrosion resistance and associated Volta potential differences. 29 4. Posttest SEM investigation indicated that the reactivation peaks of the DL-EPR test can be attributed to the preferential corrosion attack of Cr-depleted regions around Cr-carbides and Cr-nitrides.…”

Section: Skpfm Assessmentmentioning

confidence: 99%

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Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

et al. 2019

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ASME qualified welding procedures do not guarantee suitable corrosion and passivation properties for lean duplex stainless steel welds. An evaluation of two ASME qualified welding procedures to optimize the corrosion performance of tungsten inert gas (TIG) welded grade 2101 duplex stainless steel using ER2209 weld consumable was conducted. The evolution of the microstructure was examined by optical and electron microscopy, ferrite-scope measurements, and scanning Kelvin probe force microscopy. An electrochemical mini-cell was then used to characterize the electrochemical behavior of different weld regions using the techniques such as the double loop electrochemical potentiokinetic reactivation test, standard potentiodynamic polarization tests, and cyclic potentiodynamic polarization. The fusion line was the most critical zone for localized corrosion for both welding procedures, due to the formation of Cr- and Mo-depleted zones, resulting in the highest degree of sensitization. The best performance was attributed to the weld face, due to the presence of higher Cr and Mo contents, highlighting the pitting corrosion resistance. A heat input range of 1.6 kJ/mm to 1.9 kJ/mm and low current density (WPS 1) indicated better corrosion performance of all weld regions. The electrochemical corrosion response was in all cases related to microstructural characteristics of the weld regions. The influence of weld parameters on microstructure development and corrosion performance is discussed.

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Section: Ferrite/austenite -Electrochemical Activitysupporting

confidence: 89%

Section: Skpfm Assessmentmentioning

confidence: 99%

Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

et al. 2019

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“…In contrast, by keeping the environment constant, the overall shape of the active-passive transition peak as well as the magnitude is then a function of the chemical composition and alloying elements. The latter is easily demonstrated with duplex stainless steel microstructures, which show a convoluted active-passive transition peak during electrochemical polarisation, representing overlapping chromium-rich ferrite and nickel-rich austenite peaks [27][28][29].…”

Section: Resultsmentioning

confidence: 92%

Corrosion Behaviour of Type 316L Stainless Steel in Hot Caustic Aqueous Environments

Davalos-Monteiro

Wetering²,

Krawczyk

et al. 2019

Met. Mater. Int.

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The corrosion behaviour of type 316L stainless steel in aqueous 30-50 wt%. NaOH at temperatures up to 90 °C has been elucidated. Exposure to room temperature environment showed parabolic weight loss behaviour, with corrosion rates of up to 0.4 mm/year. Higher NaOH concentrations and exposure temperatures resulted in a reduced stability of the electrochemical passivity domain, associated with higher corrosion rates. Exposure to de-aerated 50 wt%. NaOH presented corrosion rates of up to 0.5 mm/year at open circuit potential, with maximum corrosion rates under polarisation of up to ≈ 18 mm/year. The formation of a dark iron-oxy-hydroxide and nickel-oxide was observed, with exposure to temperatures in excess of 50 °C. The behaviour of type 316L stainless steel in hot caustic environment is compared to types 204, 304, 2205 stainless steel, and nickel alloy 200.

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“…Electrochemical tests are well established techniques employed in studies of corrosion and passivation of stainless steels [2][3][4][5][6][7] . The use of a micrometric exposed surface area enables more precise evaluation of the electrochemical behavior of stainless steel surfaces [8][9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Passivation Level of AISI 316L Aseptic Tank Surface Quantified by On-Site Electrochemical Techniques

Guilherme¹,

Benedetti

Fugivara

et al. 2022

Mat. Res.

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Frequently stainless steel AISI 316L aseptic tanks have their passivity and corrosion resistance properties degraded by biofilm formation and localized corrosion processes. Thereby, maintenance projects are performed to repair the surface in food-grade product contact to obtain an aseptic property as defined by ASME BPE. However, the on-site non-destructive testing are limited to the liquid penetrant examination and the average roughness measurement. The on-site open circuit potential and on-site cyclic polarization measurements were conducted using a portable electrochemical minicell. The level of passivation was quantified on the tank surface, and it was performed before and after the repairing maintenance protocol be made. The results of the on-site electrochemical measurements showed a clear difference between as-degraded and repaired surfaces, indicating a sensible response to aseptic surface inspection. The on-site open circuit potential together with the on-site cyclic polarization were considered an advanced tool to support the maintenance projects of the AISI 316L aseptic surfaces.

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Reduction of austenite-ferrite galvanic activity in the heat-affected zone of a Gleeble-simulated grade 2205 duplex stainless steel weld

Cited by 43 publications

References 19 publications

Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

Corrosion Assessment of ASME Qualified Welding Procedures for Grade 2101 Lean Duplex Stainless Steel

Corrosion Behaviour of Type 316L Stainless Steel in Hot Caustic Aqueous Environments

Passivation Level of AISI 316L Aseptic Tank Surface Quantified by On-Site Electrochemical Techniques

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