Mechanism of a MIC probe

George, R.P.; Marshall, D.; Newman, R.C.

doi:10.1016/s0010-938x(03)00028-3

Cited by 21 publications

(9 citation statements)

References 5 publications

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“…Earlier work had clearly shown that biofilms promoted localized corrosion by forming patchy biofilms under which passive film thinning caused by bacterial metabolism lead to the formation of microcrevices. 24 To study the progress of the corrosion process, the average values of the first 10 values of f n , as well as average values of q, were plotted for both media (Figure 8[a]). The profile of f n values for the microbial medium was lower than that of the sterile medium by about four orders of magnitude throughout the exposure period, suggesting that the system was under continuous localized corrosion attack in the former medium.…”

Section: Resultsmentioning

confidence: 99%

Microbiologically Influenced Corrosion in UNS S31653: Detection and Analysis Using Electrochemical Noise Technique

Pujar¹,

George²,

Muraleedharan³

et al. 2011

CORROSION

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Austenitic stainless steels are susceptible to microbiologically influenced corrosion (MIC), and biofilms of slime-forming bacteria can affect the integrity of the passive film of the stainless steel components. An attempt was made to detect and analyze the MIC on UNS S31653 using electrochemical noise (EN) technique. The progress of MIC was monitored in natural reservoir water, concentrated with biofilm-forming microbes along with 0.5 M sodium chloride (NaCl) and nutrients, as well as in a similar media minus microbes (made sterile by autoclaving) using two nominally identical UNS S31653 cylindrical specimens for about 3 weeks, where current and potential noise signals were collected at 1 Hz sampling frequency. Analysis of the shot-noise parameters like frequency of corrosion events, average charge in each event, true coefficient of variation, and noise resistance showed that initiation and propagation of MIC was marked by significant changes in these parameters. The presence of crevice corrosion as well as small pits were observed in the specimen exposed to the natural water confirming MIC; this observation concurred well with the bacterial density, which increased as a function of time. The specimen exposed to sterilized water showed just a few incipient pits.

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Section: Resultsmentioning

confidence: 99%

Microbiologically Influenced Corrosion in UNS S31653: Detection and Analysis Using Electrochemical Noise Technique

Pujar¹,

George²,

Muraleedharan³

et al. 2011

CORROSION

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“…It is observed that during the first 454 h of immersion, the OCP values of the sample decreased considerably to around −710 mV (vs. SCE) and remained almost constant until the end of the measurements. It is reported that the free corrosion potential of the sample shifts towards more positive values in an aqueous environment containing a natural distribution of microorganisms [44,45]. This would be due to the release of additional oxidizers during microorganisms' reproduction and growth [44].…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

Beeswax-Colophony Blend: A Novel Green Organic Coating for Protection of Steel Drinking Water Storage Tanks

Abdikheibari

Parvizi

Moayed

et al. 2015

Metals

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Beeswax-colophony blend is mainly used as a sealant mixture for preservation applications. The beeswax itself, however, has had a long way in history taking part in conservation processes including mummification. In this research, this blend was used as a protective coating for drinking water distribution tanks. Initially, a layer with 400 μm thickness was applied on a sand blasted mild steel plate. The long-term electrochemical behavior of the coating was investigated by open circuit potential (OCP) and electrochemical microbiological characteristics of the coating, microbial and chemical examinations were performed on drinking water samples that had been in contact with the coating. Furthermore, its behavior in an up-flow anaerobic sludge blanket reactor (UASBR) in a wastewater treatment plant was investigated using the scanning electron microscopy (SEM) technique. Regarding the consistency of experimental results, it was concluded that this proposed recyclable blend could be considered as a novel green organic coating and also a good corrosion barrier even in aggressive environments. OPEN ACCESSMetals 2015, 5 1646

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“…Estas técnicas permitem avaliar não somente a morfologia microbiana, as características da superfície do metal, como também, classificar os diferentes tipos de corrosão [8,9,[12][13][14][15][16][17], além de fornecer informações sobre o tipo de ataque produzido pela bactéria [10,11]. As amostras submetidas a estas análises não necessitaram de nenhum tipo de recobrimento metálico a fim de facilitar o seu desempenho.…”

Section: Materiais E Métodosunclassified

Corrosão do aço carbono em meio sulfato na presença da bactéria Salmonella anatum

Silva¹,

Filho²

2008

Matéria (Rio J.)

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A presença de microorganismos em meios aquosos pode alterar significativamente a interface metal/meio, ou reagir diretamente com a superfície do metal. Assim, colaborando para a deterioração química do material metálico. Este trabalho tem como objetivo avaliar a corrosão do aço em meio sulfato na presença da bactéria Salmonella anatum. Para tal feito, foram conduzidos testes de imersão de amostras de aço carbono no meio sulfato, bem como, realizadas análises das amostras por microscopia eletrônica de varredura e espectroscopia de energia dispersiva por raios-X. Também, foram efetuadas medidas de pH do meio. Foi verificada a perda de massa (em termos de concentração total de íons Fe) da amostra para o tempo de imersão. Por outro lado, foi observada a acidificação do meio, variando o pH de 7,3 (no início) para 5,0 (após 21 dias de imersão). As micrografias da superfície do aço evidenciam a extensa formação de biofilme, isto é, observa-se o crescimento de camada de depósito biológico uniforme, porém, não-homogêneo. Sugerese que ocorre a formação de óxidos de ferro e fosfatos inorgânicos sobre a superfície do aço-carbono.Palavras chaves: aço-carbono, corrosão, Salmonella.Carbon steel corrosion into sulphate medium in the presence of bacterium Salmonella anatum ABSTRACTMicroorganisms into aquatic media may alter significantly the metal/media interface, that is, react directly to metal surface. The aim of this work was evaluate the carbon-steel corrosion into sulfate media in the presence of bacterium Salmonella anatum. For this purpose, immersion assay with mass loss (in terms of total Fe ions concentration) was conducted; pH measurements of the electrolyte and superficial analysis by scanning electron microscopy (SEM) and energy dispersive by X-rays analysis (EDX) techniques were conducted. It was verified that the corrosion process rate is practically insignificant for seven day-immersion time. The pH medium has changed from 7.3 to 5.0 (after 21 days). The biologic deposit film has grown on the carbon-steel surface. It is suggested iron oxides and inorganic phosphates onto carbon steel surface are formed on carbon steel surface. Keywords: carbon-steel, corrosion, Salmonella INTRODUÇÃOA corrosão pode ser caracterizada como o ataque químico sobre uma superfície metálica por um meio agressivo a este, desta forma há o retorno do material à forma de óxido em uma reação espontânea para todos os metais, exceto os nobres. Vários são os fatores que afetam o processo de corrosão, entre eles, a temperatura, a umidade, os compostos presentes no meio e os microorganismos, sejam estes, bactérias, fungos e/ou vírus.De acordo com Videla [1], praticamente todos os microorganismos vistos até o momento se relacionam, em menor ou maior grau, aos processos de biocorrosão e bioacumulação (biofouling). Os microorganismos influenciam a corrosão de metais ao favorecer reações eletroquímicas que não são comuns em condições livres de microorganismos e pela alteração da superfície de contato com o meio, seja pela fixação dos próprios microorg...

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Mechanism of a MIC probe

Cited by 21 publications

References 5 publications

Microbiologically Influenced Corrosion in UNS S31653: Detection and Analysis Using Electrochemical Noise Technique

Microbiologically Influenced Corrosion in UNS S31653: Detection and Analysis Using Electrochemical Noise Technique

Beeswax-Colophony Blend: A Novel Green Organic Coating for Protection of Steel Drinking Water Storage Tanks

Corrosão do aço carbono em meio sulfato na presença da bactéria Salmonella anatum

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