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设计4种不同Co含量6%~20%(质量分数)的Ni-Fe基模型高温合金,在模拟锅炉煤粉燃烧烟灰/气环境中研究了模型合金750℃的腐蚀行为。结果表明,500 h腐蚀后,Co含量对合金的腐蚀动力学影响较小,但最高Co含量合金具有最低的腐蚀速率。合金腐蚀产物层结构连续完整,主要为富Cr氧化物,另有少量NiCr_2O_4、硫化物以及富Al的内氧化腐蚀产物。但是,随着Co含量升高,合金的氧化膜厚度减小,内氧化程度减弱。
Four kinds of Ni-Fe-based superalloy with different Co contents of 6% ~ 20% (mass fraction) were designed and the corrosion behavior of the model alloy at 750 ℃ was investigated in the soot / gas environment simulating boiler pulverized coal combustion. The results show that after 500 h of corrosion, the content of Co has little effect on the corrosion kinetics of the alloy, but the alloy with the highest Co content has the lowest corrosion rate. The alloy corrosion product layer structure is continuous and complete, mainly Cr rich oxide, and a small amount of NiCr 2 O 4, sulfide and Al-rich internal oxidation corrosion products. However, with the increase of Co content, the thickness of oxide film decreases and the degree of internal oxidation decreases.