Pitting of Type 304 stainless steee in the presence of a biofilm containing sulphate reducing bacteria

Werner, Stefan; Johnson, C. A.; Laycock, N.J.; Wilson, P.; Webster, B.J.

doi:10.1016/s0010-938x(97)00160-1

Cited by 52 publications

(31 citation statements)

References 13 publications

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“…On the other hand, there are indications that at least in some cases biofilms may inhibit pitting rather than catalyse it [29,30].…”

Section: How Microbes May Promote Pitting?mentioning

confidence: 99%

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Microbiologically influenced corrosion of stainless steels – What is required for pitting?

Hakkarainen

2003

Materials & Corrosion

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Pitting of stainless steels in environments normally regarded as completely harmless is often attributed to microbial activity. In this paper, attention is drawn on one hand to the basic requirements for pitting of stainless steels to be possible, and on the other hand to various ways how microbial activity could contribute to a fulfilment of these requirements. For pit growth to be possible, three basic requirements must be fulfilled: 1) the environment must contain anions that can form an aggressive solution into the pit, 2) there must be a potential difference between the interior of the pit and the open surface outside the pit, 3) the temperature must exceed a critical value. The main factors that normally influence the possibility of pitting are the chloride content and the oxidising power of the environment, presence of anions other than chloride, temperature, possible presence of deposits on the steel surface, and the composition of the steel. Anions other than chloride in the bulk solution, including sulphate, usually have an inhibiting effect. Thiosulphate, however, is known to promote pitting under certain conditions. The possible ways of microbial activity to enhance pitting could include deposit formation leading to crevice type of attack, local modification of the composition of the environment to a more concentrated one, raising the electrode potential of the steel surface ("ennoblement"), or formation of reaction products that permit active dissolution inside a pit at lower potentials. Special attention is drawn to the possible action of thiosulphate by enhancing the anodic reaction at low potentials of the dissolving surface inside the pits.

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“…On the other hand, there are indications that at least in some cases biofilms may inhibit pitting rather than catalyse it [29,30].…”

Section: How Microbes May Promote Pitting?mentioning

confidence: 99%

“…Thiosulphate ions could be produced as the result of the action of sulphate reducing bacteria (SRB), which are common in most environments (e.g., [29]). Practically all waters contain sulphate ions.…”

Section: Promotion Of Dissolution Inside Pitsmentioning

confidence: 99%

Microbiologically influenced corrosion of stainless steels – What is required for pitting?

Hakkarainen

2003

Materials & Corrosion

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“…[8,9] Microbiologically influenced corrosion (MIC) is widely reported as one of the major problems causing corrosion of stainless steel. [10][11][12] However, there is little reported on MIC of weldments of DSSs. Sulfatereducing bacteria (SRB) are considered as the predominant micro-organism causing corrosion of stainless steels.…”

Section: Introductionmentioning

confidence: 99%

Corrosion of 2205 Duplex Stainless Steel Weldment in Chloride Medium Containing Sulfate-Reducing Bacteria

Antony

Raman

Kumar

2008

Metall Mater Trans A

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Influence of changes in microstructure caused due to welding on microbiologically influenced corrosion of a duplex stainless steel was studied by exposing the weldment and parent metal to chloride medium containing sulfate-reducing bacteria (SRB). Identically prepared coupons (same area and surface finish) exposed to sterile medium were used as the control. Etching-type attack was observed in the presence of SRB, which was predominant in the heat-affected zone (HAZ) of the weldment. The anodic polarization studies indicated an increase in current density for coupon exposed to SRB-containing medium as compared to that obtained for coupon exposed to sterile medium. The scanning electron microscopy (SEM) observations after anodic polarization revealed that the attack was preferentially in the ferrite phase of HAZ of the weldment, whereas it was restricted to the austenite phase of the parent metal.

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“…5) Among them, sulfate-reducing bacteria (SRB) are recognized as a major group of microorganisms, and have been the most commonly studied group of microorganisms. 6) Historically, the majority of investigations of metals associated with microorganisms had been dealt with iron, copper, aluminum and their alloys for practical industry applications, [7][8][9][10] but the effect of microorganisms associated with magnesium alloy was seldom talked about. At present, magnesium alloys have been used in the fields of aviation, spaceflight, automobile and communication.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cu2+ on Sulfate-reducing Bacteria Associated with Magnesium Alloy

et al. 2007

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Pitting of Type 304 stainless steee in the presence of a biofilm containing sulphate reducing bacteria

Cited by 52 publications

References 13 publications

Microbiologically influenced corrosion of stainless steels – What is required for pitting?

Microbiologically influenced corrosion of stainless steels – What is required for pitting?

Corrosion of 2205 Duplex Stainless Steel Weldment in Chloride Medium Containing Sulfate-Reducing Bacteria

Influence of Cu2+ on Sulfate-reducing Bacteria Associated with Magnesium Alloy

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