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Cheng Sun - One of the best experts on this subject based on the ideXlab platform.
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the effect of nitrate reducing bacteria on the corrosion behavior of x80 pipeline steel in the Soil Extract solution of shenyang
International Journal of Pressure Vessels and Piping, 2021Co-Authors: Yunlong Bai, Qingyu Qin, Boxin Wei, Liqun Gao, Cheng SunAbstract:Abstract The effect of NRB on the corrosion behavior of X80 pipeline steel in the Soil Extract solution of Shenyang was studied using polarization curve, electrochemical impedance spectroscopy, weight-loss tests and scanning electron microscope. The results show that NRB accelerates the corrosion rate of steel and promotes the formation of pitting holes on the surface of steel. XPS results show that the types of corrosion products are unchanged. Moreover, electrochemical measurements can effectively evaluate the corrosion behavior of pipeline steel affected by NRB in real time. The data in this work support that NRB can be responsible for pipeline perforation and leakage.
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comparison of ac corrosion of x80 steel in real Soil Soil Extract solution and simulated solution
Journal of Materials Engineering and Performance, 2020Co-Authors: Yunlong Bai, Qingyu Qin, Boxin Wei, Cheng SunAbstract:Corrosion of X80 steel induced by alternating current (AC) in acidic red Soil (ARS), acidic red Soil-Extracted solution (SES), and acidic red Soil-simulated solution (SSS) has been investigated. Corrosion of the steel coupons is dramatically aggravated by AC. The kinetic relationship between the corrosion rate (CR) and the AC density (JAC) in the three testing media all follows a model function, CR= αJAC + β. Grey relational analysis shows that the correlation coefficient between corrosion rates with JAC in SES and ARS is 0.614; however, the coefficient between those in SSS and ARS is only 0.484, which indicates that SES is more suitable for the evaluation of Soil corrosion than SSS.
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Effect of alternating current frequency on corrosion behavior of X80 pipeline steel in Soil Extract solution of Dagang
International Journal of Pressure Vessels and Piping, 2019Co-Authors: Qingyu Qin, Yunlong Bai, Boxin Wei, Yu Changkun, Li Nan, Cheng SunAbstract:Abstract Effects of AC frequencies on corrosion behavior of X80 pipeline steel was investigated in Soil-Extract solution of Dagang using polarization curves, electrochemical impedance spectroscopy, weight-loss test and surface analysis techniques. Results show that the corrosion potential of X80 pipeline steel shift in the negative direction under the effect of AC. The maximum pitting depth and corrosion rate of the steel specimen decrease with the AC frequency increasing, and there is a function relationship, y = 45.63x−0.5, between the maximum pitting depth and the AC frequency. The alternating current just like an oxidant changes the component proportion of corrosion products rather than the types due to AC rectification.
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effect of alternating current and sulfate reducing bacteria on corrosion of x80 pipeline steel in Soil Extract solution
Materials, 2019Co-Authors: Yongchang Qing, Yunlong Bai, Maocheng Yan, Cheng SunAbstract:AC corrosion has been considere d as a threat to the corrosion of buried pipelines. Effects of sulfate-reducing bacteria (SRB) and alternating current (AC) on corrosion of X80 pipeline steel in Soil-Extract solution were investigated by electrochemical and surface analysis techniques. AC current can inhibit the growth of planktonic and sessile SRB. The corrosion current density of steel with 10 mA/cm2 AC current is about nine times bigger than that without AC current. Corrosion morphology changes from small pitting to large pitting holes with increasing AC current density. Corrosion of steel with SRB and AC current is controlled by both active dissolution of iron and film degradation.
Naresh Magan - One of the best experts on this subject based on the ideXlab platform.
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Studies on Pesticides Mixture Degradation by White Rot Fungi
Polish Society of Ecological Engineering (PTIE), 2019Co-Authors: Sofia Gouma, Naresh Magan, Anastasia Papadaki, George Markakis, Dimitris GoumasAbstract:The capacity of five white rot fungi species to degrade linuron, metribuzin and chlorpyrifos when applied both as single pesticides and mixed together in different concentrations on nutritionally poor media. Our results suggested that Pleurotus ostreatus, Pycnoporus coccineus, Phlebiopsis gigatea and Τrametes versicolor showed remarkable tolerance to the pesticides, in all media tested. EC50 values presented a noticeable difference in the mixtures as compared with the individual ones. The minimum growth rate in the mixture was obtained by P. ostreatus whereas P. coccineus appeared to be more efficient than the rest fungal isolates, when cultivated in Soil Extract medium. P. coccineus, P. gigantea and T. versicolor produce high levels of polyphenol oxidase but only T. versicolor was capable to decompose linuron when combined with metribuzin and chlorpyrifos
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enzymatic activity osmotic stress and degradation of pesticide mixtures in Soil Extract liquid broth inoculated with phanerochaete chrysosporium and trametes versicolor
Environmental Microbiology, 2005Co-Authors: Silvia Fragoeiro, Naresh MaganAbstract:Summary In this study we examined the extracellular enzymatic activity of two white rot fungi (Phanerochaete chrysosporium and Trametes versicolor) in a Soil Extract broth in relation to differential degradation of a mixture of different concentrations (0–30 p.p.m.) of simazine, dieldrin and trifluralin under different osmotic stress (−0.7 and −2.8 MPa) and quantified enzyme production, relevant to P and N release (phosphomonoesterase, protease), carbon cycling (β-glucosidase, cellulase) and laccase activity, involved in lignin degradation. Our results suggest that T. versicolor and P. chrysosporium have the ability to degrade different groups of pesticides, supported by the capacity for expression of a range of extracellular enzymes at both −0.7 and −2.8 MPa water potential. Phanerochaete chrysosporium was able to degrade this mixture of pesticides independently of laccase activity. In Soil Extract, T. versicolor was able to produce the same range of enzymes as P. chrysoporium plus laccase, even in the presence of 30 p.p.m. of the pesticide mixture. Complete degradation of dieldrin and trifluralin was observed, while about 80% of the simazine was degraded regardless of osmotic stress treatment in a nutritionally poor Soil Extract broth. The capacity of tolerance and degradation of high concentrations of mixtures of pesticides and production of a range of enzymes, even under osmotic stress, suggest potential bioremediation applications.
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enzymatic activity osmotic stress and degradation of pesticide mixtures in Soil Extract liquid broth inoculated with phanerochaete chrysosporium and trametes versicolor
Environmental Microbiology, 2005Co-Authors: Silvia Fragoeiro, Naresh MaganAbstract:In this study we examined the extracellular enzymatic activity of two white rot fungi (Phanerochaete chrysosporium and Trametes versicolor) in a Soil Extract broth in relation to differential degradation of a mixture of different concentrations (0-30 p.p.m.) of simazine, dieldrin and trifluralin under different osmotic stress (-0.7 and -2.8 MPa) and quantified enzyme production, relevant to P and N release (phosphomonoesterase, protease), carbon cycling (beta-glucosidase, cellulase) and laccase activity, involved in lignin degradation. Our results suggest that T. versicolor and P. chrysosporium have the ability to degrade different groups of pesticides, supported by the capacity for expression of a range of extracellular enzymes at both -0.7 and -2.8 MPa water potential. Phanerochaete chrysosporium was able to degrade this mixture of pesticides independently of laccase activity. In Soil Extract, T. versicolor was able to produce the same range of enzymes as P. chrysoporium plus laccase, even in the presence of 30 p.p.m. of the pesticide mixture. Complete degradation of dieldrin and trifluralin was observed, while about 80% of the simazine was degraded regardless of osmotic stress treatment in a nutritionally poor Soil Extract broth. The capacity of tolerance and degradation of high concentrations of mixtures of pesticides and production of a range of enzymes, even under osmotic stress, suggest potential bioremediation applications.
Boxin Wei - One of the best experts on this subject based on the ideXlab platform.
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the effect of nitrate reducing bacteria on the corrosion behavior of x80 pipeline steel in the Soil Extract solution of shenyang
International Journal of Pressure Vessels and Piping, 2021Co-Authors: Yunlong Bai, Qingyu Qin, Boxin Wei, Liqun Gao, Cheng SunAbstract:Abstract The effect of NRB on the corrosion behavior of X80 pipeline steel in the Soil Extract solution of Shenyang was studied using polarization curve, electrochemical impedance spectroscopy, weight-loss tests and scanning electron microscope. The results show that NRB accelerates the corrosion rate of steel and promotes the formation of pitting holes on the surface of steel. XPS results show that the types of corrosion products are unchanged. Moreover, electrochemical measurements can effectively evaluate the corrosion behavior of pipeline steel affected by NRB in real time. The data in this work support that NRB can be responsible for pipeline perforation and leakage.
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comparison of ac corrosion of x80 steel in real Soil Soil Extract solution and simulated solution
Journal of Materials Engineering and Performance, 2020Co-Authors: Yunlong Bai, Qingyu Qin, Boxin Wei, Cheng SunAbstract:Corrosion of X80 steel induced by alternating current (AC) in acidic red Soil (ARS), acidic red Soil-Extracted solution (SES), and acidic red Soil-simulated solution (SSS) has been investigated. Corrosion of the steel coupons is dramatically aggravated by AC. The kinetic relationship between the corrosion rate (CR) and the AC density (JAC) in the three testing media all follows a model function, CR= αJAC + β. Grey relational analysis shows that the correlation coefficient between corrosion rates with JAC in SES and ARS is 0.614; however, the coefficient between those in SSS and ARS is only 0.484, which indicates that SES is more suitable for the evaluation of Soil corrosion than SSS.
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Effect of alternating current frequency on corrosion behavior of X80 pipeline steel in Soil Extract solution of Dagang
International Journal of Pressure Vessels and Piping, 2019Co-Authors: Qingyu Qin, Yunlong Bai, Boxin Wei, Yu Changkun, Li Nan, Cheng SunAbstract:Abstract Effects of AC frequencies on corrosion behavior of X80 pipeline steel was investigated in Soil-Extract solution of Dagang using polarization curves, electrochemical impedance spectroscopy, weight-loss test and surface analysis techniques. Results show that the corrosion potential of X80 pipeline steel shift in the negative direction under the effect of AC. The maximum pitting depth and corrosion rate of the steel specimen decrease with the AC frequency increasing, and there is a function relationship, y = 45.63x−0.5, between the maximum pitting depth and the AC frequency. The alternating current just like an oxidant changes the component proportion of corrosion products rather than the types due to AC rectification.
Changkun Yu - One of the best experts on this subject based on the ideXlab platform.
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The effects of sulfate reducing bacteria on corrosion of carbon steel Q235 under simulated disbonded coating by using electrochemical impedance spectroscopy
Corrosion Science, 2011Co-Authors: Jin Xu, Kaixiong Wang, Jiaxing Yang, Ximing Li, Fuhui Wang, Changkun YuAbstract:The effect of sulfate reducing bacteria (SRB) on the corrosion of the carbon steel Q235 has been investigated in the crevice under the simulated disbonded coating in the Soil-Extract solutions (SES). The results of electrochemical impedance spectroscopy (EIS) show that the corrosion rate is inhibited in the SES with SRB during the stationary phase of SRB, but enhanced during the death phase. The comparison of the polarization (R(p)) and the charge transfer resistances (R(p)) has indicated that the biofilm seriously influences the reactive procedure of metal/solution interface. SRB is found in the pits on the surface of the steel. (c) 2011 Elsevier Ltd. All rights reserved.
Jin Xu - One of the best experts on this subject based on the ideXlab platform.
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corrosion of carbon steel q235 in a crevice under a simulated disbonded coating
Corrosion, 2014Co-Authors: Jin Xu, Fuhui WangAbstract:Variations of the environmental parameters were studied in a crevice under a simulated disbonded coating in Soil Extract solutions (SES) with and without sulfate-reducing bacteria (SRB). Results show that the crevice blocks the penetration of cathodic currents and weakens the cathodic polarization of the steel. The potential of carbon steel Q235 in the presence of SRB does not reach a standard of cathodic protection (CP) in the deeper crevice. SRB leads to the increasing of the cathodic current and pH values of the SES. Metabolic sulfide is formed between a corrosion product film and a biofilm.
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the effects of sulfate reducing bacteria on crevice corrosion behavior of q235 steel
Advanced Materials Research, 2011Co-Authors: Ping Zhao, Jiaxing Yang, Dun Yong Du, Jin XuAbstract:The crevice corrosion behavior of Q235 carbon steel has been studied under the simulated disbonded coating with an aperture of 1.0mm in the Soil-Extract solution (SES) with and without sulfate-reducing bacteria (SRB) by using the electrochemical impedance spectroscopy (EIS). The surface morphologies of the steel after experiment were observed by scanning electron microscopy (SEM).The results showed that the capacitive arc of the Q235 steel electrode in SRB containing solution is smaller than that in the aseptic solution at the initial stage of test. However, after 19 days, the capacitive arc of the steel in bacteria containing solution becomes bigger than that in the aseptic solution, and corrosion rate of the steel was smaller in the SES with SRB than that without SRB. The degree of the corrosion on the surface of steel Q235 was more severe after 44 days in the SES without SRB than that with SRB. However, corrosion pits were found on the surface of Q235 steel in the SES with SRB.
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The effects of sulfate reducing bacteria on corrosion of carbon steel Q235 under simulated disbonded coating by using electrochemical impedance spectroscopy
Corrosion Science, 2011Co-Authors: Jin Xu, Kaixiong Wang, Jiaxing Yang, Ximing Li, Fuhui Wang, Changkun YuAbstract:The effect of sulfate reducing bacteria (SRB) on the corrosion of the carbon steel Q235 has been investigated in the crevice under the simulated disbonded coating in the Soil-Extract solutions (SES). The results of electrochemical impedance spectroscopy (EIS) show that the corrosion rate is inhibited in the SES with SRB during the stationary phase of SRB, but enhanced during the death phase. The comparison of the polarization (R(p)) and the charge transfer resistances (R(p)) has indicated that the biofilm seriously influences the reactive procedure of metal/solution interface. SRB is found in the pits on the surface of the steel. (c) 2011 Elsevier Ltd. All rights reserved.