- Title
- Long term corrosion of buried watermains compared with short term electrochemical testing
- Creator
- Dafter, M.
- Relation
- Corrosion and Prevention 2013: Annual Conference of the Australasian Corrosion Association (ACA 2013). Proceedings of Corrosion & Prevention 2013 (Brisbane, QLD 10-13 November, 2013) p. 73-83
- Publisher
- Australasian Corrosion Association (ACA)
- Resource Type
- conference paper
- Date
- 2013
- Description
- Comparisons between long-term measured corrosion of ferrous watermains and short-term laboratory testing of soils are published in numerous sources (see for example Romanoff 1957). However, little work has been published using an electrochemical test. Previous research (Dafter 2010) has demonstrated that corrosion rates in the very short term are highly dependent on the moisture of a soil and other physical soil attributes, such as particle size. It is also demonstrated in the literature (see for example Jack and Wilmot) that the corrosion products formed over time are dependent on these attributes. For Example, well-aerated soils will most often exhibit the formation of iron (III) oxides with a characteristic deep red tint, whilst wetter conditions will promote the formation of hydrated yellow and orange iron (III) oxides. In contrast, anaerobic and anoxic conditions result in the conversion of simple iron oxides into the formation of black rust (the most common form of which is Magnetite or Fe3O4). Various other iron corrosion products are observed in both the laboratory and the field, and these products will be dependent on the local electrolyte chemistry at each site. This paper presents the results from an extensive program of electrochemical testing of soils obtained during field exhumations of buried cast iron assets carried out by Hunter Water as part of a larger condition assessment process. A number of soil samples collected from field corrosion sites of buried watermains were tested over a 2-week period using an electrochemical cell developed by the author. These results are presented and discussed, taking into account the field corrosion found over both the long term and that observed over the short-term electrochemical test. In a number of cases, several different electrodes were used. The results are discussed in the context of long-term corrosion trends.
- Subject
- electrochemical testing; underground corrosion; long term correlation
- Identifier
- http://hdl.handle.net/1959.13/1307021
- Identifier
- uon:21310
- Identifier
- ISBN: 978-163439436-9
- Language
- eng
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