Abstract
Abstract Soil seasonal change is believed to be one of the major factors that contribute to high-pH stress corrosion cracking (SCC) of underground pipelines, although the specific role and mechanisms of the soil seasonal change in the SCC susceptibility are not clearly understood. This study is directed at investigating this role and mechanisms of the soil seasonal change through mathematical modeling. The temporal and spatial variation, with seasonal changes in the soil, of the solution chemistry and the pipe steel potential and corrosion rate in a coating disbonded region is explored. With the pipe potential at the holiday varied by soil seasonal wet and dry cycles, the model results suggest that the susceptible conditions for high-pH SCC could be formed during soil wet seasons and seasonal transitions. Depending on the level of drought and the effectiveness of cathodic protection (CP) during dry seasons, the susceptible conditions of the high-pH SCC may or may not be possible to form.
Published Version
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