Reactions Between Sodium Sulphate and Vanadium Pentoxide

Kolta, G.A.; Hewaidy, I.F.; Felix, N.S.

doi:10.1016/s0040-6031(72)80029-7

Cited by 65 publications

(28 citation statements)

References 7 publications

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“…This rapid increase in weight gain may be due to the rapid oxygen pickup by diffusion of oxygen through the molten salt layer. At the temperature of reaction, i.e., 900°C, the Na 2 SO 4 -60 pct V 2 O 5 will combine and form NaVO 3 having a melting point of 610°C, as proposed by Kolta et al, [14] which acts as a catalyst and also serves as a oxygen carrier to the metal. Chromium has a high affinity for oxygen to form Cr 2 O 3 , so in the earlier stages of hot corrosion, there is a rapid increase in weight.…”

Section: Discussionmentioning

confidence: 90%

Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment

Kumar

Tewari

Prakash

2007

Metall Mater Trans A

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Hot corrosion is mainly due to the dissolution of protective oxides in the molten salt at the metal surface and their reprecipitation at some other sites as nonprotective porous mass. The hot corrosion attack along the grain boundaries leading to subsurface precipitation of oxides and sulfides also contributes to weakening of material. Ferritic steel with 2.25Cr 1Mo is used widely as a candidate material in the steam generating system of power plants. Hot corrosion studies were conducted on 2.25Cr-1Mo unwelded as well as welded steel specimens with molten salt coated after exposure at 900°C under cyclic conditions. The thermogravimetric technique was used to establish the kinetics of corrosion X-ray diffraction (XRD); scanning electron microscopy/energy-dispersive analysis (SEM/EDAX) was used to analyze the corrosion products.

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Section: Discussionmentioning

confidence: 90%

Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment

Kumar

Tewari

Prakash

2007

Metall Mater Trans A

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“…The rapid increase in the mass gain during the initial period of exposure to molten salt environment at 900 • C may by due to the rapid diffusion of oxygen through the molten salt layer. Kotla et al [21] proposed that in the temperature range of 900 • C, the Na 2 SO 4 and V 2 O 5 will combine to form NaVO 3 , as represented by Eq. (1) having a melting point of 610 • C [22]:…”

Section: Discussionmentioning

confidence: 99%

A study on hot corrosion behaviour of Ni–5Al coatings on Ni- and Fe-based superalloys in an aggressive environment at 900°C

Mahesh

Jayaganthan

Prakash

2008

Journal of Alloys and Compounds

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“…3a). Kolta et al [27] suggested that in the temperature range of 900°C, the Na 2 SO 4 and V 2 O 5 will react to form NaVO 3 which acts as a catalyst and also serves as an oxygen carrier to the base alloy through the open pores present on the surface, which in turn leads to rapid oxidation of the base elements of the substrate. Fe 2 O 3 was observed as a main phase in the oxide scale of the uncoated steel.…”

Section: (A) (B)mentioning

confidence: 99%

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

Kaushal¹,

Singh

Prakash

2011

Oxid Met

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High-velocity-oxy-fuel (HVOF) spray and detonation-gun (D-gun) spray techniques were used to deposit Ni-20Cr coatings on a commonly used boiler steel ASTM-SAE 213-T22. The specimens, with and without coating, were subjected to molten salt (Na 2 SO 4 -60%V 2 O 5 ) deposition in a laboratory furnace at 900°C to determine hot-corrosion resistance. Specimens were also exposed to the superheater zone of a thermal power plant boiler at an average temperature of 700°C under cyclic conditions to ascertain their erosion-corrosion (E-C) behavior. Mass-change measurements were taken to approximate the kinetics of corrosion and erosion-corrosion. In the case of E-C, the thickness lost data were also taken at the end of the exposure. The exposed specimens were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy/energy dispersive spectroscopy (FE-SEM/EDS). The HVOF-sprayed coating was found to be intact during exposure to both given environments; whereas the D-gun coating showed spallation of its oxide scale during exposure to the molten salt environments. An overall analysis of the results indicated that the HVOF-sprayed Ni-20Cr coating should be a better choice for the given boiler applications.

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Reactions Between Sodium Sulphate and Vanadium Pentoxide

Cited by 65 publications

References 7 publications

Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment

Studies on Hot Corrosion of the 2.25 Cr-1Mo Boiler Tube Steel and Its Weldments in the Molten Salt Na2SO4-60 pct V2O5 Environment

A study on hot corrosion behaviour of Ni–5Al coatings on Ni- and Fe-based superalloys in an aggressive environment at 900°C

Comparative High Temperature Analysis of HVOF-Sprayed and Detonation Gun Sprayed Ni–20Cr Coating in Laboratory and Actual Boiler Environments

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