Influences of Thermophilic Sulfate-Reducing Bacteria on the Corrosion of Carbon Steel at Different Temperature

2011 ◽  
Vol 396-398 ◽  
pp. 1963-1968
Author(s):  
Shi Hong Zhang ◽  
Fei Kuang ◽  
Jin Zhong Zhang ◽  
Xiong Zhou ◽  
Gui Hong Lan ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Rate ◽  
Growth Curves ◽  
Sulfate Reducing Bacteria ◽  
Reduction Product ◽  
Stable Phase ◽  
Sulfate Reducing ◽  
Corrosion Behaviors ◽  
Higher Temperature ◽  
Reducing Bacteria

The growth and the corrosion behaviors of thermophilic sulfate reducing bacteria (SRB), desulfotomaulum thermocisternum strain ST90, were studied in this work. It was found that the growth curves and the main reduction products were influenced greatly by the growth temperatures. The time of the exponential phase and the stable phase decreased with the increase of growth temperatures. The reduction product of this kind of SRB was mainly H2S when it grew at 60°C. With the decrease of growth temperatures, thiosulfate came up as an internal reduction product. The thiosulfate was re-reduced by SRB at the growth temperatures of 40 and 50°C. When the growth temperature came to 30°C, no H2S was generated. The regulation of corrosion rate changed was coincident with the changes of the main reduction products of the SRB. This kind of SRB could accelerate the corrosion rate of carbon steel when grew at higher temperature. But the corrosion rate of carbon steel could be inhibited when it grew at 30°C.

scholarly journals Microbial Corrosion of API 5L X-70 Carbon Steel by ATCC 7757 and Consortium of Sulfate-Reducing Bacteria

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Arman Abdullah ◽  
Nordin Yahaya ◽  
Norhazilan Md Noor ◽  
Rosilawati Mohd Rasol
Keyword(s):  
Weight Loss ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Sulfate Reducing Bacteria ◽  
Desulfovibrio Vulgaris ◽  
Corrosion Morphology ◽  
Sulfate Reducing ◽  
Weight Loss Method ◽  
Loss Method ◽  
Reducing Bacteria

Various cases of accidents involving microbiology influenced corrosion (MIC) were reported by the oil and gas industry. Sulfate reducing bacteria (SRB) have always been linked to MIC mechanisms as one of the major causes of localized corrosion problems. In this study, SRB colonies were isolated from the soil in suspected areas near the natural gas transmission pipeline in Malaysia. The effects of ATCC 7757 and consortium of isolated SRB upon corrosion on API 5L X-70 carbon steel coupon were investigated using a weight loss method, an open circuit potential method (OCP), and a potentiodynamic polarization curves method in anaerobic conditions. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were then used to determine the corrosion morphology in verifying the SRB activity and corrosion products formation. Results from the study show that the corrosion rate (CR) of weight loss method for the isolated SRB is recorded as 0.2017 mm/yr compared to 0.2530 mm/yr for ATCC 7757. The Tafel plot recorded the corrosion rate of 0.3290 mm/yr for Sg. Ular SRB and 0.2500 mm/yr forDesulfovibrio vulgaris. The results showed that the consortia of isolated SRB were of comparable effects and features with the single ATCC 7757 strain.

scholarly journals Formation of Biofilms and Biocorrosion on AISI-1020 Carbon Steel Exposed to Aqueous Systems Containing Different Concentrations of a Diesel/Biodiesel Mixture

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Ivanilda Ramos de Melo ◽  
Severino Leopoldino Urtiga Filho ◽  
Fernando Jorge Santos Oliveira ◽  
Francisca Pessoa de França
Keyword(s):  
Carbon Steel ◽  
Sulfate Reducing Bacteria ◽  
Experimental Conditions ◽  
Exposed Area ◽  
Sulfate Reducing ◽  
Corrosion Rates ◽  
Biodiesel Blend ◽  
Corrosion Pits ◽  
Reducing Bacteria ◽  
Significant Concentration

Environmental and economic concerns accelerated biofuels research and industrial production. Many countries have been using diesel and biodiesel blends as fuels justifying research on biofilms formation and metals corrosion. Cylinders made of AISI-1020 carbon steel with an exposed area of 1587 mm2, water, and water associated with B3 fuel (diesel/biodiesel blend at 97 : 3 v/v) were used.The formation of biofilms was detected, and biocorrosion was detected on AISI-1020. The results showed a variation in sessile microflora during the experiments. In the biofilms, a significant concentration of aerobic, anaerobic, IOB,Pseudomonas aeruginosa, and sulfate-reducing bacteria was observed. The corrosion rates varied between0.45±0.01and0.12±0.01 mm/year, depending on the experimental conditions. The main corrosion products identified were various forms of FeOOH, magnetite, and all forms of FexSy. In systems where there were high levels of sulfate reducing bacteria, corrosion pits were observed. In addition, the aliphatic hydrocarbons present in the fluid containing 10% B3 were totally degraded.

Sign in / Sign up

Export Citation Format

Share Document