Statistical analyses of field corrosion data for ductile cast iron pipes buried in sandy marine sediments
- Tokyo Gas Co., Ltd. (Japan). Fundamental Technology Research Lab.
Field corrosion studies were conducted on bare, ductile cast iron pipes buried 17 y in sandy marine sediment classified as sandy soil and containing iron bacteria, sulfate-reducing bacteria (SRB), and other bacteria. Chemical and biochemical analyses of the sediment were performed in the laboratory. Correlation between the maximum corrosion depth (P{sub max}) and 21 environmental factors was evaluated by applying a correlation analysis. On that basis, the factors controlling corrosion damage were considered by quantification theory analysis. A corrosion mechanism was presented to explain the corrosion phenomena. The corrosion site had a positive correlation with the anaerobic site, characterized by particularly high levels of water content and ferrous sulfide generated by SRB. Corrosion was classified as graphitic and attributed to formation of extensive tubercles resulting from high activity of iron bacteria in the bicarbonate enriched soil.
- OSTI ID:
- 449642
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 2 Vol. 53; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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