热力管网作为城市基础设施的重要组成部分，由于输送高温高压的水或蒸汽为危险介质，其突发破坏往往造成巨大经济损失，并引发安全事故。采用现场埋片试验方法，研究了典型热力管道材料Q235钢在300℃含有高浓度Cl^-的盐碱土中的腐蚀行为。研究表明，Q235钢在300℃盐碱土中的埋片6个月腐蚀产物为红色锈层，且外锈层疏松，呈现大的孔洞状，内锈层致密，与基体结合良好，锈层主要成分为Fe2O3；随时间的推移，平均腐蚀速率呈先升高后降低的趋势，表明高温下形成的腐蚀产物有效地保护了基体的进一步腐蚀。
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 C1- 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 Fe2Oa. Over time, the average corrosion rate first increased and then decreased, indicating that the formation of corrosion products effectively protected the substrate.
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