Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 649, Issue -, Pages 739-748Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2018.08.362
Keywords
Sewer; Corrosion; Rebar; Chloride; Hydrogen sulfide; Mineral liberation analysis
Categories
Funding
- Australian Research Council [LP150101337]
- Australian Research Council DECRA Fellowship [DE170100694]
- Australian Research Council [LP150101337] Funding Source: Australian Research Council
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Hydrogen sulfide is a controlling factor for concrete corrosion in sewers, although its impact on sewer rebar corrosion has not been investigated to date. This study determined the corrosion mechanism of rebar in sewers by elucidating the roles of chloride ions, apart from the effects of hydrogen sulfide and biogenic sulfuric acid. The nature and distribution of rusts at the steel/concrete interface were delineated using the advanced mineral analytical techniques, including mineral liberation analysis and micro X-ray diffraction which is the first-ever use in such studies. The corrosion products were found to be mainly iron oxides or oxy-hydroxides. H2S and biogenic sulfuric add did not directly participate in the product formation of steel partly covered by concrete or directly exposed to sewer atmosphere. Instead, chloride ions played an important role in initiating steel corrosion in sewers, supported by a thin chloride-enriched layer at the steel/rust interface. Away from the chloride-enriched layer, iron oxides accumulated on both sides of the mill-scale to form a corrosion layer and corrosion-filled paste respectively. The corrosion layer around rebar circumference was non-uniform and the rust thickness with respect to polar coordinates followed a Gaussian model. These findings support predictions of sewer service lifetime and developments of corrosion prevention strategies. (C) 2018 Elsevier B.V. All rights reserved.
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