Bi-modal trending for corrosion loss of steels buried in soils. (June 2018)

• Record Type: Journal Article
• Authors: Petersen, Robert B.; Melchers, Robert E.
• Is Part Of: Corrosion science. Volume 137(2018)
• Page Start: 194
• Page End: 203
• Publication Date: 2018-06
• Subjects: Steel -- Soils -- Mass loss -- Modelling -- Long-term -- Trends -- Data scatter; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.03.048
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: For exposures up to 15–17 years of steels buried in a variety of soils the progression of corrosion loss shows bi-modal trending for almost all soils. For the remaining cases the trends can be interpreted as not yet having fully developed the bi-modal trend within the 15–17 year exposure period. A bi-modal trending representation also is appropriate for maximum pit depth. Abstract: Corrosion loss data from the 1957 NBS study for steels buried in a large variety of soils and exposed over 12–17 years are re-interpreted, supported with estimates for scatter in the data. This shows that losses predominantly are consistent with the bi-modal trending pattern also previously observed for steel exposed in a variety of other environments. For short-term and low time of wetness exposures the trends are consistent with mode 1 of the bi-modal trend. These reinterpretations should permit development of better understanding of the factors important for short- and-long term corrosion trends and for improved modelling and prediction.