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在不同S含量模拟锅炉煤灰和烟气环境中,研究了两种典型先进超超临界锅炉候选Ni-Co基合金CCA617和Ni-Fe基合金GH 2984在750℃时的热腐蚀行为。结果表明:在0.02%SO_2气氛中,两种合金腐蚀速率均较小,腐蚀层致密性较好,内硫化较轻;在1.5%SO_2气氛中,两种合金腐蚀速率均明显加快,腐蚀层显著增厚并伴随破裂剥落发生,内硫化加剧。在两种S含量气氛中,合金的腐蚀产物基本相同:CCA 617腐蚀产物主要以Cr_2O_3为主,以及少量(Ni,Co)Cr_2O_4,Al_2O_3和硫化物;GH 2984合金主要为Fe_2O_3,Cr_2O_3,少量NiCr_2O4和硫化物。基于实验结果讨论了两种合金的腐蚀机理及S含量对合金腐蚀过程的影响。
The hot corrosion behavior of candidate Ni-Co based alloy CCA617 and Ni-Fe based alloy GH 2984 at two typical advanced ultra-supercritical boilers at 750 ℃ was studied in different s-content simulated boiler soot and flue gas environments. The results show that in 0.02% SO 2 atmosphere, the corrosion rates of the two alloys are small, the corrosion layer is compact and the internal vulcanization is light. In 1.5% SO 2 atmosphere, the corrosion rates of the two alloys are obviously accelerated, and the corrosion layer is significant Thickening accompanied by rupture and spalling occurs, the vulcanization intensifies. The corrosion products of the alloy are basically the same in the two S content atmospheres. The corrosion products of CCA 617 mainly consist of Cr 2 O 3 and a small amount of (Ni, Co) Cr 2 O 4, Al 2 O 3 and sulfide. The GH 2984 alloy is mainly Fe 2 O 3, Cr 2 O 3 and a small amount of NiCr 2 O 4 And sulfide. Based on the experimental results, the corrosion mechanism of the two alloys and the effect of S content on the corrosion process of the alloy were discussed.