Impact of biofouling on the electrochemical behaviour of 304 stainless steel in natural seawater
作者:
Brenda Little,
Richard Ray,
Patricia Wagner,
Zbigniew Lewandowski,
WhonChee Lee,
WilliamG Characklis,
Florian Mansfeld,
期刊:
Biofouling
(Taylor Available online 1991)
卷期:
Volume 3,
issue 1
页码: 45-59
ISSN:0892-7014
年代: 1991
DOI:10.1080/08927019109378161
出版商: Taylor & Francis Group
关键词: Microorganisms;seawater;marine;stainless steels;electrochemistry
数据来源: Taylor
摘要:
Biofilm formation on 304 stainless steel (S30400) does not necessarily result in an ennoblement of the corrosion potential. Instead, biofilms composed of aerobic and anaerobic bacteria from Gulf of Mexico water formed an anaerobic biofilm/metal interface and caused the corrosion potential to move in the negative direction. Biofilms from the same source containing photosynthetic diatoms in the presence of light produced aerobic biofilm/metal interfaces and a positive shift (ennoblement of the corrosion potential). Corrosion potentials of stainless steels exposed in natural seawater cannot be predicted without an understanding of the composition of the biofilm and its impact on interfacial chemistry. In this paper, measurements of corrosion potential, interfacial pH and dissolved oxygen have been correlated with SEM/EDAX surface analyses to evaluate the electrochemical behaviour of stainless steels exposed to Gulf of Mexico water. The interfacial chemistries that influence the corrosion potential are also discussed.
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