Direct electrochemical tests were conducted to evaluate the corrosion rate and interference of the stray current on district heating pipelines in real soil environments. The tests were conducted in three sites according to the soil environment (general, river nearby, and in stray current hazardous areas). Then, the effects of soil physical factors, including porosity and water content, on corrosion were evaluated using electrochemical tests. In addition, the stray current interference was quantified by measuring the corrosion potential of the pipeline steel in the real soil. The increased charge by stray current was calculated by comparing the stray current interference charge with the equilibrium state charge. Analyzing the corrosion rate measured in each site using linear polarization resistance and impedance electrochemical spectroscopy tests showed that the corrosion rate of pipeline steel was about 120 μm/year in the absence of stray current interference. However, when the interference of stray current was affected, the corrosion rate of pipeline steel is increased by 33.3% in the river nearby.

Subject
Electrochemical impedance spectroscopy, Water, Electrochemical cells, Corrosion rate, Overpotential, Electrochemical testing, Stray current interference, Aqueous environments, Pipelines, Steel, Stray current, Linear polarization resistance, Soil
Keywords:
District heating pipeline, Soil corrosion, Electrochemistry, Stray current corrosion
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2023
Association for Materials Protection and Performance (AMPP)
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