目的 研究630 ℃煤电锅炉高温级换热部件候选管材S31035耐高温硫腐蚀性能。方法 涂覆高碱、低碱两类煤灰的S31035试样被置于充满模拟烟气(700 ℃、SO2体积分数为0.3%)的试验装置中进行反应。试验期间，对样品进行多次称量，进而绘出腐蚀动力学曲线。观察试样宏观特征，且采用X-射线衍射设备、电子显微镜和能谱分析设备等，对腐蚀生成物的表面/截面微观形貌及成分进行分析。结果 试样在低碱煤灰中腐蚀，表面生成了相对致密的(FeCr)2O3氧化膜，腐蚀生成物层很薄，腐蚀轻微。而对应高碱煤灰，腐蚀生成物分层生长且严重剥离，腐蚀2 000 h失重27 mg/cm²，且在腐蚀层中出现了Cr和S富集，发生了较严重的高温硫腐蚀。煤灰的碱金属含量是影响S31035耐高温硫腐蚀性能的关键因素。在相同的高硫环境中，涂覆低碱煤灰时，试样的耐高温腐蚀性能良好;涂覆高碱煤灰时，试样的耐高温腐蚀性能较差。结论 S31035可应用于630 ℃煤电锅炉高温级换热部件，当燃用高硫煤时，可通过加强清除部件表面煤灰来抑制高温腐蚀。

The work aims to study high temperature sulfur corrosion resistance of S31035, which is used as the key candidate tube of high-temperature heating surface of 630 ℃ boiler. Corrosion tests were conducted by placing S31035 steel coated by high or low alkali coal ash in simulated flue gas (700 ℃, SO2 volume concentration of 0.3%). The samples were weighted at intervals during the test, then corrosion kinetics curve was plotted. The macro characteristics of the samples were observed, and the surface/cross-section morphology and composition of the corrosion products were analyzed by X-ray diffraction equipment, electron microscope and energy dispersive spectrometer. The results showed that the S31035 steel undergone corrosion after coated by low alkali coal ash, with relatively dense (FeCr)2O3 oxide film on the surface of the sample. Meanwhile corrosion product film was very thin. However, the corrosion products grew in layer and peeled off severely in the high alkali coal ash, weight loss exceeded 27 mg/cm2 after 2 000 h. Cr and S were enriched in the corrosion layer, resulting in serious high temperature sulfur corrosion. It showed that the alkali metal content of coal ash was the key factor affecting the high temperature sulfur corrosion resistance of S31035. In the same high sulfur environment, the high temperature sulfur corrosion resistance for low alkali coal ash was good, but for high alkali coal ash was poor. S31035 can be applied to the high temperature heat exchange components of 630 ℃ coal-fired boiler. When burning high sulfur coal with high alkali coal ash, the high temperature corrosion can be inhibited by strengthening the removal of coal ash on the surface of heating surface.