Corrosion by Soils

Statistical Soil Characterization of an Underground Corroded Pipeline Using In-Line Inspections

“…The latter deposits exhibit a different mineral composition from the soil surface to the bedrock. In this regard, three horizons can be discriminated [13]:…”

“…This table classifies the soil's aggressiveness in terms of redox potential and resistivity. Authors such as Kulman [22] and Miller et al [23] have reported alternative classes of soil resistivity [13,24,25]; however, in general, all researchers agreed that the soil tends to be more corrosive when the resistivity is reduced. Overall, smaller resistivity would accelerate macro-galvanic corrosion cells, triggering localized corrosion, and not micro-galvanic corrosion cells associated with uniform corrosion.…”

“…Overall, smaller resistivity would accelerate macro-galvanic corrosion cells, triggering localized corrosion, and not micro-galvanic corrosion cells associated with uniform corrosion. However, Jack and Wilmott remarked that this dependency might be valid only in metals without cathodic protection, which are suggested to exhibit better performance [13].…”

“…These zones are affected by two principal factors: temperature and rainfall [13]. An intensification of the rainfall may accelerate the leaching of soluble minerals at the top layer.…”

“…These horizons depend on the surrounding climate conditions, producing particular soil profiles (see Figure 2). Following Jack and Wilmott's work, a brief description of soils under arid, tropical, temperate and arctic conditions is presented [13]. A significant lack of rainfall water characterizes arid regions such as deserts.…”