In situ study of selective dissolution of duplex stainless steel 2205 by electrochemical scanning tunnelling microscopy

Femenia, Marc; Pan, Jinshan; Leygraf, Christofer; Luukkonen, Pirjo

doi:10.1016/s0010-938x(00)00180-3

Cited by 84 publications

(43 citation statements)

References 20 publications

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“…Primarily the ferrite was corroded under the droplet deposit with some minor corrosion observed on the austenite. The same corrosion pattern has previously been reported under similar exposure conditions [45,63,64], with ferrite clearly the electrochemically more active phase leading to selective dissolution [17,18,44,45,56,[64][65][66][67][68][69][70][71][72]. The ferrite phase is, usually, the electrochemically more active phase in 2205 duplex stainless steel Fig.…”

Section: As-received Microstructuresupporting

confidence: 76%

Correlative EBSD and SKPFM characterisation of microstructure development to assist determination of corrosion propensity in grade 2205 duplex stainless steel

Örnek

Engelberg

2015

J Mater Sci

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Correlative electron backscatter diffraction (EBSD) and scanning Kelvin probe force microscopy (SKPFM) analysis has been carried out to characterise microstructure development and associated corrosion behaviour of as-received and 750°C heat-treated grade 2205 duplex stainless steel. High-resolution EBSD analysis revealed the presence of r-and v-phase, secondary austenite, Cr 2 N, and CrN after ageing treatment. SKPFM Volta potential measurements confirmed the formation of discrete reactive sites, indicating local corrosion propensity in the microstructure. Cr 2 N, r-phase, and inter-granular v-phase had the largest net cathodic activity, followed by CrN and intra-granular v-phase showing medium electrochemical activity, with ferrite and austenite (including secondary austenite) showing net anodic activity. Corrosion screening confirmed selective corrosion of ferrite in the as-received and 750°C-aged conditions with the corrosion propensity of secondary phases staying in-line with SKPFM observations. Stress corrosion micro-cracks were also observed and are discussed in light of microstructure corrosion propensity.

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Section: As-received Microstructuresupporting

confidence: 76%

Correlative EBSD and SKPFM characterisation of microstructure development to assist determination of corrosion propensity in grade 2205 duplex stainless steel

Örnek

Engelberg

2015

J Mater Sci

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“…At 1.2 V Ag/AgCl , the ferrite was preferentially dissolved at transpassive condition, while the austenite phase remained to be un-attacked, in accordance with the Volta potential mapping results. The higher tendency of ferrite to undergo transpassive dissolution at T room was already observed on commercial grade 2205 DSSs (without nitride precipitates) in previous studies [28,29].…”

Section: Influence Of Temperature On the Corrosion Behavior Of 2205 Dsssupporting

confidence: 68%

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Bettini

Kivisäkk

Leygraf

et al. 2013

Electrochimica Acta

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PostprintThis is the accepted version of a paper published in Electrochimica Acta. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Bettini, E., Kivisäkk, U., Leygraf, C., Pan, J. [Year unknown!] Study of corrosion behavior of a 22% Cr duplex stainless steel: influence of nano-sized chromium nitrides and exposure temperature. Electrochimica ActaAccess to the published version may require subscription. AbstractChromium nitrides may precipitate in duplex stainless steels during processing and their influence on the corrosion behavior is of great importance for the steel performance. In this study, the influence of nanosized quenched-in chromium nitrides on the corrosion behavior of a heat treated 2205 duplex stainless steel was investigated at room temperature and 50 °C (just above critical pitting temperature). The microstructure was characterized by SEM/EDS and AFM analyses, and quenched-in nitrides precipitated in the ferrite phase were identified by TEM analysis. Volta potential mapping at room temperature suggests lower relative nobility of the ferrite matrix. Electrochemical polarization and in-situ AFM measurements in 1 M NaCl solution at room temperature show a passive behavior of the steel despite the presence of the quenched-in nitrides in the ferrite phase, and preferential dissolution of ferrite phase occurred only at transpassive conditions. At 50 °C, selective dissolution of the austenite phase was observed, while the ferrite phase with the quenched-in nitrides remained to be stable. It can be concluded that the finely dispersed quenched-in nitrides do not cause localized corrosion, whereas the exposure temperature has a strong influence on the corrosion behavior of the duplex stainless steel.

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“…At about E corr + 850 mV, the current was increased rapidly with the potential. It has been well demonstrated that the current increase at high anodic potentials can be attributed to the pitting corrosion, oxidation of Cr +3 into Cr +6 ions, or oxygen evolution [30]. The combination of some of these phenomena can also occur in some cases.…”

Section: Pitting Corrosion Susceptibilitymentioning

confidence: 99%

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

Atapour

Sarlak

Esmailzadeh

2015

Int J Adv Manuf Technol

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The effect of friction stir welding (FSW) on the pitting corrosion resistance of a lean duplex stainless steel was investigated in chloride-containing and chloride-free electrolytes. FSW was carried out by employing a constant rotation speed of 800 rpm at the welding speeds of 50, 100, and 150 mm/min using WC-based tool. Cyclic polarization results showed the same corrosion resistance of the base metal and welded joints in 0.1 M H 2 SO 4 . The optical microscopy observations after cyclic polarization tests revealed that no signs of pitting corrosion were evident for the base metal and different FS welds in chloride-free 0.1 M H2SO4 solution. In contrast, a wide positive hysteresis loop indicative of pitting corrosion susceptibility was displayed for the base metal and FS welds in 0.1 M H 2 SO 4 +0.1 M NaCl solution. The optical micrographs of pitting corrosion in the base metal and various FS welds demonstrated that the size of pits was decreased and the number of pits was increased after FSW. It was also found that increasing the welding speed led to an increase in the number of pits and a decrease in the size of pits. In other words, the resistance to pit growth was improved by decreasing the heat input during FSW. These results were interpreted with respect to the noticeable grain refinement that occurred during FSW.

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In situ study of selective dissolution of duplex stainless steel 2205 by electrochemical scanning tunnelling microscopy

Cited by 84 publications

References 20 publications

Correlative EBSD and SKPFM characterisation of microstructure development to assist determination of corrosion propensity in grade 2205 duplex stainless steel

Correlative EBSD and SKPFM characterisation of microstructure development to assist determination of corrosion propensity in grade 2205 duplex stainless steel

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Pitting corrosion susceptibility of friction stir welded lean duplex stainless steel joints

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