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Qing Y.,CAS Shenyang Institute of Metal Research | Yang Z.,Oil Gas Storage and Transportation Company | Xian J.,Oil Gas Storage and Transportation Company | Xu J.,CAS Shenyang Institute of Metal Research | And 5 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2016

With the rapid development of electricity and transport industry, more and more buried pipelines are parallel or cross to the high voltage transmission line and the electrified railway. In this work, microbiological analysis method was used to investigate the effect of alternating current (AC) on the physiology of sulfate reducing bacteria (SRB). Electrochemical methods, including open circuit potential, potentiondynamic polarization curves and electrochemical impedance spectroscopy (EIS) on Q235 steel samples, were performed in soil leaching solution to study the electrochemical behavior with the presence or absence of AC and SRB. The corrosion morphology was observed by scanning electron microscopy (SEM). The results indicate that the AC which current density is 50 A/m2 and frequency is 50 Hz has only a small impact on the growth of SRB, but its alternating electric field can reduce the adsorption and promote the desorption of the biofilm. During the initial experiment, the active biofilm can inhibit the corrosion of Q235 steel due to the electronegativity and the physical barrier, but the microbial metabolites would promote the corrosion during the later experiment without active biofilm. AC can improve the corrosion rate and lead the corrosion products loose because of the rectifying effect, the alternating electric field and the self catalytic effect of pitting corrosion. © All right reserved.


Wu T.-Q.,CAS Shenyang Institute of Metal Research | Wu T.-Q.,Xiangtan University | Yan M.-C.,CAS Shenyang Institute of Metal Research | Zeng D.-C.,Oil Gas Storage and Transportation Company | And 4 more authors.
Acta Metallurgica Sinica (English Letters) | Year: 2015

MIC of X80 pipeline steel in a near-neutral pH soil solution in the presence and absence of sulfate-reducing bacteria (SRB) was monitored by electrochemical techniques and microbiological tests. The results show that soil solution is more close to the complex soil environment around pipeline. The activity of SRB leads to the shift of the phase response to low frequency, the decrease of electrolyte resistance and the alteration of dielectric constant of the film. Both the activity and metabolite of SRB influence the corrosion behavior of the steel. The steel surface undergoes localized attack in the SRB-inoculated soil solution, whereas only slight uniform corrosion occurs in the sterile soil solution. © 2014 The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg.


Wu T.,CAS Shenyang Institute of Metal Research | Ding W.,China National Petroleum Corporation | Zeng D.,Oil Gas Storage and Transportation Company | Xu C.,Oil Gas Storage and Transportation Company | And 4 more authors.
Journal of the Chinese Society of Corrosion and Protection | Year: 2014

Electrochemical characteristics of sulphate-reducing bacteria (SRB) induced corrosion of X80 pipeline steel were studied in an acid soil solution by mean of microbiological test methods and electrochemical techniques. The results showed that there exist a period for the newly-inoculated bacteria to be acclimatized to the new environment, during which death of large quantity of bacteria did occur; the open circuit potential of the steel is always lower in the inoculated soil solution than that in the sterile environment; SRB inhibits the corrosion process of the steel in the early stage and accelerates the corrosion process in the later stage during the experiment; while the activity of SRB alters the dielectric of the metal/solution interface, which is responsible for the increase of the corrosion rate of the pipeline steel in the later stage of the experiment. © 2014, Chinese Society of Corrosion and Protection. All rights reserved.


Wu T.,CAS Shenyang Institute of Metal Research | Yang P.,Oil Gas Storage and Transportation Company | Zhang M.,China National Petroleum Corporation | Xu J.,CAS Shenyang Institute of Metal Research | And 3 more authors.
Journal of the Chinese Society of Corrosion and Protection | Year: 2014

In most cases, microbiologically induced corrosion (MIC) of pipeline was investigated in near neutral culture-media, however, the particular and new environments in which pipeline services were ignored. In this paper, morphology and composition of corrosion productsinduced by sulphate-reducing bacteria (SRB) in an acid soil solution of X80 pipeline steel were examined by X- ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The results showed that the activities of SRB have little influence on the structure of the corrosion product on the steel surface, while it facilitates the transformation of sulfur from oxidation states into redox status and thereby, the deposition of sulfide and phosphuret, altering the composition of the corrosion product. In the presence of SRB, the sensitivity to local corrosion of the steel is increased notably, and the metabolite of SRB and the direct electron transfer (DET) from the steel to SRB may be responsible for the increase. © 2014, Chinese Society of Corrosion and Protection. All rights reserved.


Yang S.,CAS Shenyang Institute of Metal Research | Yang S.,Shenyang Ligong University | Zhao C.,Shenyang Ligong University | Yan M.C.,CAS Shenyang Institute of Metal Research | And 5 more authors.
Corrosion Science and Protection Technology | Year: 2015

Galvanostatic pulse measurement (GPM) was introduced as a new non-destructive technique to monitor corrosion of X80 pipeline steel in a red soil environment. Corrosion rate and double layer capacitance of the metal/soil interface for X80 pipeline steel in red soil were measured by GPM, and then the acquired data were compared with those measured by polarization method. Results show that the galvanostatic pulse method is applicable for monitoring soil corrosion of the steel and it can provide a nondestructive analytical probe into double layer characteristics at soil/steel interface. The polarization resistance measurement indicated that corrosion rate of the steel decreased with time in the water saturated red soil. © 2015 Chinese Academy of Sciences. All rights reserved.

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