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在腐蚀介质为Na Cl∶Na_2SO_4=1∶2、热腐蚀温度为650℃条件下,对锅炉用Super304H、TP347H和HR3C不锈钢焊接接头进行了模拟锅炉实际工作环境的热腐蚀试验,研究了腐蚀温度和时间等对焊接接头不同区域抗热腐蚀性能的影响,并对腐蚀形貌和腐蚀产物进行了分析。结果表明,对比3种锅炉用钢焊接热影响区的热腐蚀增重率可见,TP347H锅炉钢热影响区的热腐蚀增重率最小,其次为Super304H锅炉钢,而HR3C锅炉钢热影响的耐热腐蚀性能最差;Super304H焊接接头、TP347H焊接接头和HR3C焊接接头的腐蚀区域宽度分别为48、38和88μm,腐蚀区形态疏松且存在明显腐蚀孔洞。
In the corrosion medium NaCl: Na_2SO_4 = 1: 2, the hot corrosion temperature is 650 ℃, the boiler Super304H, TP347H and HR3C stainless steel welded joints were simulated in the actual working environment of the hot corrosion test, the corrosion temperature and Time on the different regions of the hot weld corrosion resistance, corrosion morphology and corrosion products were analyzed. The results show that compared with the heat corrosion rate of heat affected zone of three kinds of boiler steel, the hot corrosion rate of heat affected zone of TP347H boiler is the smallest, followed by Super304H boiler steel, while HR3C boiler steel heat-affected heat-resistant The corrosion performance of Super304H, TP347H and HR3C are 48, 38 and 88μm, respectively. The corrosion zone is loose and there are obvious corrosion holes.