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The long-distance oil pipeline in the R-K region of Chad has experienced frequent failures of heat-shrink sleeves, significantly impacting normal production in the oilfield. Therefore, a systematic study of the soil corrosion behaviour of pipelines after heat-shrink sleeve damage is essential before implementing targeted anti-corrosion measures to prevent and control soil corrosion. Through sample composition analysis, electrochemical testing, and immersion experiments on the crude oil pipeline in the specified area of Chad, as well as morphology and composition analysis of the corrosion products formed on the pipeline, the main cause of corrosion failure was inferred to be the high content of CO2 and Cl? in the soil, as their synergistic effect induces pitting corrosion on the pipeline. Furthermore, the high humidity and abundant rainfall in the Chad region increase the corrosion risk. The primary soil corrosion products are Fe2O3 and FeCO3, along with small amounts of Fe3O4, FeCl (OH), and CaCO3. The average corrosion rate along the pipeline soil line ranges from 0.10 to 0.13 mm a-1.

来源平台：MATERIALI IN TEHNOLOGIJE