What is it about?
For experimentation, ductile iron specimens were immersed in the acidic simulated soil solution for 365 days. Physical deterioration assessment over time was carried out in terms of corrosion rates measured at intervals of 180 and 365 days. Moreover, a significant change in the percentage composition of key elements and phases was quantified. Furthermore, the mechanical properties of the grains were found to be considerably reduced after 365 days of immersion in the acidic environment by the nanoindentation technique.
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Why is it important?
The results revealed an alarming increase of structural degradation at the nanoscale for some of the grains due to corrosion. The significance of the current research is its in-depth analysis of the corrosion-induced degradation of ductile iron pipes which enhances the knowledge related to the failure of these pipelines.
Perspectives
Corrosion-induced failure of buried ferrous pipelines causes significant economic losses to the world. Literature shows that the research on the corrosion-induced degradation assessments of ductile iron pipelines is limited and mostly deals with the physical deterioration i.e., loss of wall thickness determined by short-term research. This paper addresses this gap and presents a comparatively long-term study on corrosion and its subsequent effect on the composition and nanomechanical properties of buried ductile iron pipelines in an accelerated corrosive environment.
Professor Milos B. Djukic
University of Belgrade, Faculty of Mechanical Engineering
Read the Original
This page is a summary of: Corrosion induced failure of the ductile iron pipes at micro- and nano-levels, Engineering Failure Analysis, December 2020, Elsevier,
DOI: 10.1016/j.engfailanal.2020.105169.
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