High‐temperature corrosion behaviors of typical nickel alloy coatings in a simulated boiler coal ash/gas environment in the Zhundong region,Materials and Corrosion

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High‐temperature corrosion behaviors of typical nickel alloy coatings in a simulated boiler coal ash/gas environment in the Zhundong region
Materials and Corrosion ( IF 1.6 ) Pub Date : 2020-01-16 , DOI: 10.1002/maco.201911167
Jun Wu ₁ , Xiaojiang Wu ₂ , Peize Cheng ₁ , Nianwei Dai ₁ , Jin Li ₁ , Yiming Jiang ₁

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The high‐temperature corrosion behaviors of five nickel alloy coatings used in coal‐fired boilers in the Zhundong region (Xinjiang province) were investigated in simulated coal ash and coal‐combusted flue gas environment at 650°C for 250 and 500 hr. The samples were analyzed by weight gain experiment, X‐ray diffraction test, and scanning electron microscopy technique with energy‐dispersive spectroscopy. The results indicated that the corrosion level is in the order of NiCrMo13 ≈ Hastelloy C‐276 (276) > NiCrBSi > Inconel 718 (718) > 45CT. The compositions of the corrosion scale in five nickel alloy coatings mainly consist of NiO, Ni₃S₂, and Cr₂O₃. The enrichment of Cr in the corrosion scale in 45CT, 718, and NiCrBSi coatings inhibits the formation of oxide and sulfide on the coating surface. The presence of W and Mo in nickel alloy coatings accelerates the formation of corrosion products, thus weakening the corrosion resistance of NiCrMo13 and 276 in simulated coal ash and coal‐combusted flue gas environment.

更新日期：2020-01-16

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