Role of chlorides in hot corrosion of a cast Fe–Cr–Ni alloy. Part II: thermochemical model studies

Shores, David A.; Mohanty, Bani P.

doi:10.1016/j.corsci.2004.04.014

Cited by 50 publications

(31 citation statements)

References 2 publications

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“…The oxides grow according to the mechanism of active oxidation in which chlorine plays a catalytic role [18]. Similar results have been found for Fe-Cr-Ni and Fe-Mn-Al alloys with NaCl deposits [19][20][21]. After several cycles, depletion of Al in the coating surface occurs.…”

Section: Discussionsupporting

confidence: 74%

Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

et al. 2007

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A Ni-24Cr-6Al-0.7Y (NiCrAlY) coating was deposited on a nickel-base superalloy by low-pressure plasma spraying, and the top coating, ZrO 2 partially stabilized with Y 2 O 3 (7.5 wt%), was deposited on the NiCrAlY coating by air-plasma spraying. The cyclic-oxidation behavior of the NiCrAlY + YSZ coating exposed to NaCl vapor was investigated under atmospheric pressure at 1,050°C, 1,100°C and 1,150°C. The cyclic-oxidation life of the NiCrAlY + YSZ coating in the presence of NaCl vapor was shortened compared with that in air. The higher the temperature is, the shorter the cyclic oxidation life. The oxide scale formed at the interface between the bond coat and the ceramic layer after exposure to NaCl vapor consisted of voluminous and non-protective NiO, Al 2 O 3 and NiCr 2 O 4 spinel. The failure of the TBC exposed to NaCl vapor occurs within the top coat and close to the YSZ/thermal growth oxide interface. The failure mechanism has been discussed based on the experimental results and thermodynamics.

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Section: Discussionsupporting

confidence: 74%

Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

et al. 2007

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“…Fe-20% Cr alloy KCl, NaCl, Na 2 SO 4 , and K 2 SO 4 pure salts and a mixture of these salts at 800 ∘ C Alkali oxides under oxidizing condition have higher solubility for Fe and Cr containing species as compared to their solubility in alkali sulphates [94] 8…”

Section: Discussionmentioning

confidence: 99%

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Mudgal

Singh

Prakash

2014

International Journal of Corrosion

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Incinerators are widely used to burn the municipal waste, biowaste, wood, straw, and biomedical waste. Combustion of these types of waste results in generation of chlorides of sodium and potassium which may attack the metallic part of the incinerator. In biofuel-fired boilers, similar type of highly corrosive environment is present. Attempt has been made to review the corrosion problems and their solutions as per the available literature.

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“…We used the Gibbs free energy minimization method and the extensive thermochemical database of HSC Chemistry [8], which contains the enthalpy (H), entropy (S), and heat capacity (C) data for more than 17,000 chemical compounds. This model has been used to estimate the equilibrium compositions of chemical compounds at high temperature by several researchers [9][10][11][12]. The model calculated the amounts of the Na 2 O·2SiO 2 , Na 2 O· SiO 2 , and K 2 O·4SiO 2 melts that contributed to agglomeration [1,13], so that the potential for bed agglomeration could be predicted.…”

Section: Model Simulationmentioning

confidence: 99%

Prevention of bed agglomeration with iron oxide during fluidized bed incineration of refuse-derived fuels

Kim

Lee

2009

Korean J. Chem. Eng.

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The present study was performed to evaluate the effect of iron oxide addition on the prevention of bed agglomeration during the fluidized bed incineration of refuse-derived fuels (RDFs) having different alkali contents. To investigate the extent of bed agglomeration as a function of the Fe 2 O 3 /(K 2 O+Na 2 O) molar ratio, a simulation was performed by using a thermodynamic equilibrium model. Based on this simulation, potassium (K) component exhibited a much higher affinity for iron (Fe) component than for silicon (Si) component, and the extent of agglomeration was remarkably reduced. Therefore, a small amount of iron oxide added to the bed effectively reduced the extent of bed agglomeration in the fluidized bed incineration process. Furthermore, the extent of agglomeration decreased as the molar ratio of Fe 2 O 3 /(K 2 O+Na 2 O) increased until unity was attained. In excess Fe 2 O 3 , no potassium silicate melts existed in the products, while the amount of sodium silicate melts remained constant.

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Role of chlorides in hot corrosion of a cast Fe–Cr–Ni alloy. Part II: thermochemical model studies

Cited by 50 publications

References 2 publications

Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

Cyclic-Oxidation Behavior of Thermal-barrier Coatings Exposed to NaCl Vapor

Corrosion Problems in Incinerators and Biomass-Fuel-Fired Boilers

Prevention of bed agglomeration with iron oxide during fluidized bed incineration of refuse-derived fuels

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