Influence of CeO2 superficial coating on the high temperature corrosion behavior of 2.25 Cr-1 Mo Steel in SO2 + O2 atmospheres

Mukherjee

Das

et al. 2015

Surface Engineering

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This paper investigates the influence of ceria (CeO 2 ) coating on high temperature oxidation behaviour of 2?25Cr-1Mo steel. The superficial coating of CeO 2 powder was prepared for experimental investigation. The isothermal corrosion study of uncoated and coated specimens was carried out in air oxidation environment at 973 K for 8 h. The corrosion rate and reaction kinetics were studied and the post corroded scales were characterised in scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction. The results clearly indicate that CeO 2 coated specimen improves the high temperature oxidation resistance than uncoated specimens. The improvement of oxidation resistance in presence of CeO 2 coating can be attributed to the formation of fine grained oxide on the scale, changed mechanism of scale growth from outer cation migration to inner anion migration and enhancement of scale adhesion with the substrate. The detail mechanism of the oxidation of CeO 2 coated and uncoated specimen is further discussed in this paper.

Section: Discussionmentioning

confidence: 99%

CeO₂ based coating for high temperature oxidation protection

Mukherjee

Das

et al. 2015

Surface Engineering

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“…[4][5][6][7][8] Several early literatures have reported that micron-size yttria (Y 2 O 3 ) coating are extensively used for protection of high-temperature oxidation of various Cr-based alloys. [9,10] The improvement of oxidation resistance of nanocrystalline CeO 2 -coated alloys over the micron-size ceria-coated alloys have been reported in the past by several researchers [11,12]. Patil et al [11] have reported the significant improvement of oxidation resistance of nanocrystalline CeO 2 -coated SS-304 stainless steel alloys.…”

Section: Introductionmentioning

confidence: 93%

“…[15] High-temperature oxidation/corrosion leads to drastic material degradation of the Cr-Mo steels and finally results in premature failure of the components. [16][17][18][19][20] Preliminary investigation on the improvement of high-temperature oxidation resistance of Ni, Cr and Ni-Cr superalloys with the application of nanocrystalline ceramic powder coating are conducted by several researchers. [21][22][23] But detailed investigation on the use of nano ceria-coated Cr-Mo steels to improve the high-temperature oxidation resistance are not reported yet.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Y₂O₃plasma coating for high temperature oxidation protection

Journal of Adhesion Science and Technology

Roy

Mitra

2015

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This paper investigates the effect of nano-size and micron-size Y 2 O 3 powder-coated specimen on high-temperature oxidation resistance of low-alloy Cr-Mo steel (2.25 Cr-1 Mo steel). Both are powder coated by plasma spray coating method. The oxidation rate and reaction kinetics are studied and the post-corroded scales are characterized in Field Emission Scanning Electron Microscope and X-ray Diffraction. The results clearly indicate that nanosize Y 2 O 3 -coated (nanostructured) specimen improves the high-temperature oxidation resistance in comparison to the micron-size Y 2 O 3 -coated specimen. The detail mechanism of the oxidation of both the coated specimen is discussed in detail in this paper.

“…[4][5][6][7][8] The improvement of oxidation resistance of nanocrystalline CeO 2 coated alloys over the microsize CeO 2 coated alloys has been reported in the past by several researchers. 9,10 Ghosh et al 9 have reported the tremendous improvement of oxidation resistance of nanocrystalline CeO 2 coated SS-304 stainless steel over micrometre size CeO 2 coated alloys.…”

Section: Introductionmentioning

confidence: 98%

Nanostructured CeO₂ coating for high temperature oxidation protection

Roy

Das

et al. 2016

Surface Engineering

Self Cite

This paper investigates the influence of nanostructured ceria (CeO 2 ) coating on high temperature oxidation behaviour of 2?25 Cr-1 Mo steel. The isothermal corrosion study of the micrometre size and nanostructured CeO 2 coated specimens was conducted in air oxidation environment at 973 K for 8 h. The corrosion rate and reaction kinetics were studied, and the post-corroded scales were characterised by field emission scanning electron microscopy and X-ray diffraction. The results clearly indicate that the nanostructured CeO 2 coated specimen improves the oxidation resistance than does the micrometre size CeO 2 coated specimen. The improvement of oxidation resistance in the case of nanostructured CeO 2 can be attributed to the formation of semimolten zone, which consists of nanostructured CeO 2 particle. On the other hand, in the absence of semimolten nanostructured zone, the micrometre size powder coated specimen shows higher corrosion rate in comparison to the nanosize CeO 2 powder coated specimen.