Galvanic corrosion between the constituent phases in duplex stainless steel

Tsai, Wen‐Ta; Chen, Jhen-Rong

doi:10.1016/j.corsci.2007.03.035

Cited by 164 publications

(91 citation statements)

References 14 publications

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“…33,35,36,41,42,46,47 Similar observations of selective attack on the ferrite phase have also been reported on lean DSS 2101 and 2202. 2,48,49 In lean DSS 2202, the measured corrosion depthto-area ratio was low, indicating a strong tendency for repassivation of active corrosion sites.…”

Section: Discussionsupporting

confidence: 66%

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

et al. 2018

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Corrosion rates of strained grade UNS S32202 (2202) and UNS S32205 (2205) duplex stainless steel wires have been measured, in situ, using time-lapse X-ray computed tomography. Exposures to chloride-containing (MgCl 2 ) atmospheric environments at 50°C (12-15 M Cl − and pH~5) with different mechanical elastic and elastic/plastic loads were carried out over a period of 21 months. The corrosion rates for grade 2202 increased over time, showing selective dissolution with shallow corrosion sites, coalescing along the surface of the wire. Corrosion rates of grade 2205 decreased over time, showing both selective and pitting corrosion with more localised attack, growing preferentially in depth. The nucleation of stress corrosion cracking was observed in both wires.

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Section: Discussionsupporting

confidence: 66%

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

et al. 2018

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“…7(b) and (c) with ferrite (a) and austenite (c) phases marked. This is a well recorded phenomenon in duplex stainless steels in chloride bearing solutions and is caused by a galvanic couple that forms between the two phases as a result of chemical partitioning; Cr, Mo, W concentrating in ferrite and Ni, N in austenite (Ref [14][15][16][17]. The high nickel and nitrogen give austenite a more noble potential in chloride solutions making it the cathode to the more negative ferrite (the anode).…”

Section: Corrosion Morphologymentioning

confidence: 99%

Effect of Plastic Deformation on the Corrosion Behavior of a Super-Duplex Stainless Steel

Renton

Elhoud

Deans

2010

J. of Materi Eng and Perform

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The role of plastic deformation on the corrosion behavior of a 25Cr-7Ni super-duplex stainless steel (SDSS) in a 3.5 wt.% sodium chloride solution at 90°C was investigated. Different levels of plastic strain between 4 and 16% were applied to solution annealed tensile specimens and the effect on the pitting potential measured using potentiodynamic electrochemical techniques. A nonlinear relationship between the pitting potential and the plastic strain was recorded, with 8 and 16% causing a significant reduction in average E p , but 4 and 12% causing no significant change when compared with the solution-annealed specimens. The corrosion morphology revealed galvanic interaction between the anodic ferrite and the cathodic austenite causing preferential dissolution of the ferrite. Mixed potential theory and the changing surface areas of the two phases caused by the plastic deformation structures explain the reductions in pitting potential at certain critical plastic strain levels. End-users and manufacturers should evaluate the corrosion behavior of specific cold-worked duplex and SDSSs using their as-produced surface finishes assessing in-service corrosion performance.

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“…One of the methods for investigating the corrosion behavior of each phase of dual-phase steel is the use of a single-phase electrode preparation. 8 Lee et al separated super duplex stainless steel into ferrite phase and austenite phase by selective dissolution and embedding with resin, and they evaluated the corrosion resistance of each phase. 9 Although a single-phase electrode enables accurate measurement of the resistance of each phase, preparation of a separated specimen is complicated and sometimes difficult in cases in which one phase has a corrosion behavior similar to that of another phase.…”

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confidence: 99%

Passivity of Dual-Phase Carbon Steel with Ferrite and Martensite Phases in pH 8.4 Boric Acid-Borate Buffer Solution

Yanagisawa

Nakanishi

Hasegawa

et al. 2015

J. Electrochem. Soc.

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Passivity of a dual-phase carbon steel with ferrite and martensite phases was investigated in pH 8.4 boric acid-borate buffer solution. The corrosion potential of the dual-phase steel was higher than that of pure martensitic steel and lower than that of pure ferritic steel. In dynamic polarization measurements, the passivity-maintaining current of the dual-phase steel was an intermediate value of those of pure ferritic and martensitic steels. EIS revealed that both the charge transfer resistance and capacitance of the oxide film formed on the dual-phase steel were intermediate between those of pure ferritic and martensitic steels. Although the donor density in the oxide film of the dual-phase steel was similar to that of pure ferritic steel, it was smaller than that of pure martensitic steel. SECM showed that the passive film formed on the martensite phase of the dual-phase steel had better electronic conductivity than that of the passive film formed on the ferrite phase. These differences in local passivity of the dual-phase steel suggested that the passive film formed on the ferrite phase has better passivity but larger scattering of the property than that of the passive film on the martensite phase. The local passivity of the dual-phase steel was strongly dependent on the texture of the substrate material.

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Galvanic corrosion between the constituent phases in duplex stainless steel

Cited by 164 publications

References 14 publications

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

Time-dependent in situ measurement of atmospheric corrosion rates of duplex stainless steel wires

Effect of Plastic Deformation on the Corrosion Behavior of a Super-Duplex Stainless Steel

Passivity of Dual-Phase Carbon Steel with Ferrite and Martensite Phases in pH 8.4 Boric Acid-Borate Buffer Solution

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