Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium

P. J. Antony, R. K. Singh Raman, Shobhana Chongdar, Preadeep Kumar, R. Raman

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

Sulfate-reducing bacteria (SRB) play significant role in the corrosion of passivating materials like stainless steels. A detailed interpretation of the mechanism of interaction of biogenic sulfide with the passive film of stainless steel is scarce. In the present study coupons of solution-annealed 2205 type duplex stainless steel (DSS) were exposed to chloride medium containing SRB species, Desulfovibrio desulfuricans, and the corrosion damage was assessed by electrochemical and microscopic techniques. Etching of the duplex structure and crevice type attack were noticed in the case of coupons exposed for 40 days to SRB. There was no noticeable feature of corrosion on coupons exposed to sterile medium under identical conditions. The deterioration of passivity in the presence of SRB was also indicated during anodic polarization, by a sharp increase in the anodic current at potentials close to open circuit potential (E corr). The anodic limiting current density was determined to be an order of magnitude higher in the presence of SRB as compared to that for the specimen exposed to sterile medium. The corrosion damage observed on specimen exposed under freely corroding conditions to SRB for 40 days was more predominantly seen after an exposure to SRB for 14 days followed by anodic polarization. SEM studies of crevices observed after anodic polarization indicated that the attack was initiated at the grain boundaries and slowly encroached into austenite grains. ESCA studies reveal that SRB activity can modify the passive film through incorporation of sulphide ions in the film. The nature and mechanism of SRB attack on DSS are discussed.

Original languageEnglish
Title of host publication47th Annual Conference of the Australasian Corrosion Association 2007
Subtitle of host publicationCorrosion Control 2007
Pages511-517
Number of pages7
Publication statusPublished - 1 Dec 2007
Event47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007 - Sydney, NSW, Australia
Duration: 4 Dec 20075 Dec 2007

Publication series

Name47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007

Conference

Conference47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007
CountryAustralia
CitySydney, NSW
Period4/12/075/12/07

Keywords

  • Crevice corrosion
  • Duplex stainless steels (DSS)
  • Passive film
  • Polarization
  • Sulfate-reducing bacteria (SRB)

Cite this

Antony, P. J., Singh Raman, R. K., Chongdar, S., Kumar, P., & Raman, R. (2007). Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium. In 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007 (pp. 511-517). (47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007).
Antony, P. J. ; Singh Raman, R. K. ; Chongdar, Shobhana ; Kumar, Preadeep ; Raman, R. / Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium. 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007. 2007. pp. 511-517 (47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007).
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abstract = "Sulfate-reducing bacteria (SRB) play significant role in the corrosion of passivating materials like stainless steels. A detailed interpretation of the mechanism of interaction of biogenic sulfide with the passive film of stainless steel is scarce. In the present study coupons of solution-annealed 2205 type duplex stainless steel (DSS) were exposed to chloride medium containing SRB species, Desulfovibrio desulfuricans, and the corrosion damage was assessed by electrochemical and microscopic techniques. Etching of the duplex structure and crevice type attack were noticed in the case of coupons exposed for 40 days to SRB. There was no noticeable feature of corrosion on coupons exposed to sterile medium under identical conditions. The deterioration of passivity in the presence of SRB was also indicated during anodic polarization, by a sharp increase in the anodic current at potentials close to open circuit potential (E corr). The anodic limiting current density was determined to be an order of magnitude higher in the presence of SRB as compared to that for the specimen exposed to sterile medium. The corrosion damage observed on specimen exposed under freely corroding conditions to SRB for 40 days was more predominantly seen after an exposure to SRB for 14 days followed by anodic polarization. SEM studies of crevices observed after anodic polarization indicated that the attack was initiated at the grain boundaries and slowly encroached into austenite grains. ESCA studies reveal that SRB activity can modify the passive film through incorporation of sulphide ions in the film. The nature and mechanism of SRB attack on DSS are discussed.",
keywords = "Crevice corrosion, Duplex stainless steels (DSS), Passive film, Polarization, Sulfate-reducing bacteria (SRB)",
author = "Antony, {P. J.} and {Singh Raman}, {R. K.} and Shobhana Chongdar and Preadeep Kumar and R. Raman",
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Antony, PJ, Singh Raman, RK, Chongdar, S, Kumar, P & Raman, R 2007, Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium. in 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007. 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007, pp. 511-517, 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007, Sydney, NSW, Australia, 4/12/07.

Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium. / Antony, P. J.; Singh Raman, R. K.; Chongdar, Shobhana; Kumar, Preadeep; Raman, R.

47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007. 2007. p. 511-517 (47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007).

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

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T1 - Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium

AU - Antony, P. J.

AU - Singh Raman, R. K.

AU - Chongdar, Shobhana

AU - Kumar, Preadeep

AU - Raman, R.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - Sulfate-reducing bacteria (SRB) play significant role in the corrosion of passivating materials like stainless steels. A detailed interpretation of the mechanism of interaction of biogenic sulfide with the passive film of stainless steel is scarce. In the present study coupons of solution-annealed 2205 type duplex stainless steel (DSS) were exposed to chloride medium containing SRB species, Desulfovibrio desulfuricans, and the corrosion damage was assessed by electrochemical and microscopic techniques. Etching of the duplex structure and crevice type attack were noticed in the case of coupons exposed for 40 days to SRB. There was no noticeable feature of corrosion on coupons exposed to sterile medium under identical conditions. The deterioration of passivity in the presence of SRB was also indicated during anodic polarization, by a sharp increase in the anodic current at potentials close to open circuit potential (E corr). The anodic limiting current density was determined to be an order of magnitude higher in the presence of SRB as compared to that for the specimen exposed to sterile medium. The corrosion damage observed on specimen exposed under freely corroding conditions to SRB for 40 days was more predominantly seen after an exposure to SRB for 14 days followed by anodic polarization. SEM studies of crevices observed after anodic polarization indicated that the attack was initiated at the grain boundaries and slowly encroached into austenite grains. ESCA studies reveal that SRB activity can modify the passive film through incorporation of sulphide ions in the film. The nature and mechanism of SRB attack on DSS are discussed.

AB - Sulfate-reducing bacteria (SRB) play significant role in the corrosion of passivating materials like stainless steels. A detailed interpretation of the mechanism of interaction of biogenic sulfide with the passive film of stainless steel is scarce. In the present study coupons of solution-annealed 2205 type duplex stainless steel (DSS) were exposed to chloride medium containing SRB species, Desulfovibrio desulfuricans, and the corrosion damage was assessed by electrochemical and microscopic techniques. Etching of the duplex structure and crevice type attack were noticed in the case of coupons exposed for 40 days to SRB. There was no noticeable feature of corrosion on coupons exposed to sterile medium under identical conditions. The deterioration of passivity in the presence of SRB was also indicated during anodic polarization, by a sharp increase in the anodic current at potentials close to open circuit potential (E corr). The anodic limiting current density was determined to be an order of magnitude higher in the presence of SRB as compared to that for the specimen exposed to sterile medium. The corrosion damage observed on specimen exposed under freely corroding conditions to SRB for 40 days was more predominantly seen after an exposure to SRB for 14 days followed by anodic polarization. SEM studies of crevices observed after anodic polarization indicated that the attack was initiated at the grain boundaries and slowly encroached into austenite grains. ESCA studies reveal that SRB activity can modify the passive film through incorporation of sulphide ions in the film. The nature and mechanism of SRB attack on DSS are discussed.

KW - Crevice corrosion

KW - Duplex stainless steels (DSS)

KW - Passive film

KW - Polarization

KW - Sulfate-reducing bacteria (SRB)

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M3 - Conference Paper

AN - SCOPUS:84867811143

SN - 9781622762439

T3 - 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007

SP - 511

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BT - 47th Annual Conference of the Australasian Corrosion Association 2007

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Antony PJ, Singh Raman RK, Chongdar S, Kumar P, Raman R. Influence of sulfate-reducing bacteria on corrosion of 2205-type duplex stainless steel in chloride medium. In 47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007. 2007. p. 511-517. (47th Annual Conference of the Australasian Corrosion Association 2007: Corrosion Control 2007).