期刊
CORROSION
卷 65, 期 11, 页码 707-717出版社
NATL ASSOC CORROSION ENG
DOI: 10.5006/1.3319097
关键词
bacteria; carbon steel; corrosion; Duluth-Superior Harbor; microbiologically influenced corrosion; pilings
资金
- U.S. Army Corps of Engineers, Detroit District [0601153N]
Field observations and laboratory testing were used to conclude that aggressive localized corrosion of carbon steel pilings in Duluth-Superior Harbor, Minnesota and Wisconsin, is caused by the following sequence of biological, chemical. and physical events. Iron-oxidizing bacteria colonize the carbon steel sheet pilings and produce tubercles, made up of intact and/or partly degraded remains of bacterial cells mixed with amorphous hydrous ferric oxides. The reducing conditions beneath the tubercles cause copper dissolved in the water to precipitate. A galvanic couple is established between the copper layer and the iron substratum. Ice scouring breaks the tubercles. Exposure of the copper-covered iron to oxygen causes the galvanic current to increase. The result is aggressive localized corrosion.
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