Journal
CORROSION SCIENCE
Volume 50, Issue 7, Pages 2030-2039Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2008.05.005
Keywords
iron; X-ray diffraction; rust; oxidation; pitting corrosion
Funding
- USEPA
- United States Geological Survey's Mineral Resource Surveys Program [DW14999901]
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Physiochemical data were obtained for five iron tubercles from a single drinking water distribution system (DS). Texturally, there were two groups based on internal morphology: one with a core of soft brownish material marbled with veins of a hard black material, the other has a core consisting mostly of the hard, black material. Three iron mineral phases occur, alpha-FeOOH, gamma-FeOOH, or Fe3O4. All three coexist in each tubercle but in widely varying proportions. These iron pipe tubercles exhibit a greater diversity within a single DS than previously thought. Because the chemical conditions for the formation of each material is different, water quality parameters may not be the main control of tubercle formation and growth. (C) 2008 Elsevier Ltd. All rights reserved.
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