Saline Soil Corrosion Field Testing of Steam Pipelines for Heat-supply Network

The heat-supply pipeline is an important part of the urban infrastructure. Because the transported high temperature and high pressure water or steam is a dangerous medium, the burst damage often causes huge economic losses and leads to accidents. The present work studied the corrosion behavior of Q235 steel buried in saline soil containing Cl-of high concentrations at 300 ℃ by field test methods. The results showed that the corrosion products of Q235 steel buried in saline soil for 6 months at 300 ℃ formed a red rust layer. The loose outer corrosion products contained large holes. However, the inner rust layer was dense and adhered to the substrate closely. The rust layer contained mainly Fe2O3. Over time, the average corrosion rate first increased and then decreased, indicating that the formation of corrosion products effectively protected the substrate.