Analysis of Anaerobic Biocorrosion Characterization in Different Oxidative Reduction Potential
Date Issued
2005
Date
2005
Author(s)
Liao, Hua-Mao
DOI
zh-TW
Abstract
The water quality parameters, microbial communities and water corrosion current were investigated in this study to evaluate the relationship between the corrosion behaviors and these factors on mild steel under various controlled oxidative reduction potential (ORP). While the ORP increased, the facultative heterotrophics, other than sulfate-reducing bacteria (SRB), are more predominant rather than SRB under facultative condition. The results of the increase of the total organic carbon (TOC) utilization rate and the decrease of the sulfate reducing rate (SRR) under facultative condition demonstrate that. Furthermore, the variations of microbial communities determined by PCR (polymerase chain reaction)/cloning method under various ORP conditions also demonstrated the SRB were no more the dominant group while the ORP in the reactor increased. Besides, both SRB and sulfur-oxidizing bacteria (SOB) were simultaneous exist on the surface of the testing mild steel coupons while the ORP was controlled to as high as -180 mV. The results from the electrochemical methods show that the corrosion currents were decreased as the ORP increased; however, the results from the weight loss methods show that the more corrosive weight loss was occurred on the higher ORP. It was suggested that the anode depolarization was accelerated by both the SRB and SOB on the surface of the mild steel.
The technology of the molecular biology was powerful diagnosis tool, which can reveal the microbial communities under various samples. A 16S rDNA library related to the anaerobic biocorrosion under different ORP was built in this study. That will be a good basis for further application on the development of the rapid diagnosis on the anaerobic boicorrosion.
Subjects
厭氧生物腐蝕
硫酸鹽還原菌
分子生物技術
anaerobic biocorrosion
SRB
The technology of the molecular biology
Type
thesis
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