A review on molten sulfate salts induced hot corrosion

Hu, Shaozheng; Finklea, Harry O.; Liu, Xingbo

doi:10.1016/j.jmst.2021.03.013

Cited by 58 publications

(34 citation statements)

References 160 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same conclusion was also draw by Hu. et al [10] when they studied the hot corrosion of Ni-Cr alloy in Na 2 SO 4 and provided corresponding calculation of solubility. These two oxides, which are more resistant to alkaline Na 2 O dissolution than Cr 2 O 3 , have fewer holes and defects and can effectively prevent the outward diffusion of metal elements and the inward transport of Cl 2 and O 2 .…”

Section: The Effect Of Higher Content Of Al and Ti In K452mentioning

confidence: 99%

“…Part of the research aimed at the hot corrosion caused by Na 2 SO 4 and NaVO 3 molten salt, affecting inland gas turbine blades. The investigations believe that the equilibrium phase of Na 2 O and SO 3 produced by Na 2 SO 4 decomposition leads to alkaline or acidic dissolution of oxide film [8][9][10]. For example, D. Prabhakaran et al [9] studied the hot corrosion behavior of SuperCo-605 in this environment and found that the oxidation products were mainly Cr 2 O 3 , MnO, NiO, etc.…”

Section: Introductionmentioning

confidence: 99%

“…For example, D. Prabhakaran et al [9] studied the hot corrosion behavior of SuperCo-605 in this environment and found that the oxidation products were mainly Cr 2 O 3 , MnO, NiO, etc. Hu et al [10] studied the hot corrosion behavior of Ni-Cr coating in pure Na 2 SO 4 molten salt. Another part of the research aimed at the hot corrosion caused by Na 2 SO 4 and NaCl mixed molten salt, affecting the gas turbine blades working in coastal areas.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

et al. 2022

View full text Add to dashboard Cite

The corrosion of cobalt-based DZ40M and nickel-based K452 superalloy at 900 °C was investigated by NaCl salt coating. Accordingly, the differences in hot corrosion behavior were analyzed considering the development methods and elementary composition by comparing the two alloys’ failure. Then, the corrosion mechanism induced by NaCl was proposed by comparing oxidation and hot corrosion behavior. The relatively continuous Al2O3 and TiO2 formed on K452 superalloy with higher content of Al and Ti have lower solubility and less damage in Na2O. Thus, the hot corrosion rate of K452 is lower than that of DZ40M with higher content of C, Cr, and W.

show abstract

Section: The Effect Of Higher Content Of Al and Ti In K452mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The protective thermal spray coating applied to the surface of solid fuel boiler components is designed to ensure operation under extreme conditions and extend service life by creating a barrier between the corrosive environment and the substrate material, thereby providing a greater resistance to corrosion and oxidation [ 1 , 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion Behavior of TWAS and HVOF NiCr-Based Coatings in Molten Salt

et al. 2023

View full text Add to dashboard Cite

In order to extend the life of boilers by applying an anti-corrosion coating without the need to dismantle them, it is advisable to find coatings that can be applied using cheaper and portable techniques, such as Twin Wire Arc Spray technology (TWAS). In this study, we compare selected NiCr-based coatings and two uncoated steel substrates (steel 1.7715 and 1.4903). Two coatings, Cr3C2 - 25% NiCr and Hastelloy C-276 are deposited using High velocity oxygen-fuel technology (HVOF) and three coatings, NiCrTi, NiCrMo, and Inconel 625, are deposited using TWAS. In addition to the corrosion weight gain during 50 cycles of loading in an 18% Na2SO4 and 82% Fe2(SO4)3 salt environment at 690 °C evaluated using the gravimetric method, the microstructure and phase composition of the coatings were analyzed on the samples after the exposure in order to compare the properties and gain a deeper understanding of the corrosion kinetics. Coating cross-sections and free-surfaces were observed with a scanning electron microscope (SEM) with an energy-dispersive (EDX) system. The phase composition was investigated using X-ray diffraction (XRD) and Raman spectroscopy. No significant differences were observed between the TWAS and HVOF coating methods for the coatings compared. Due to the similar corrosion products found on all coatings, a very effective corrosion protective layer was formed on the surface, forming a barrier between the corrosive environment and the coating regardless of the used deposition technology. Therefore, for industrial use on the inner surface of coal-fired boilers we recommend NiCrTi, NiCrMo, or Inconel coatings prepared with the more cost-effective and portable TWAS technology.

show abstract

“…It has been widely applied in turbine blades and other components for high-temperature applications. MCrAlY coatings are usually used as a single overlayer or a bond coating of thermal barrier coatings (TBC) (Liu et al, 2015;Shen et al, 2015;Zakeri et al, 2020;Hu et al, 2021). The concentration of Al in MCrAlY coating is very important because it directly affects the formation of the protective Al 2 O 3 film.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Oxidation Behavior of NiCoCrAlY Coating With Different Sm2O3 Concentration on TiAl Alloy

et al. 2021

View full text Add to dashboard Cite

In order to improve the oxidation resistance of TiAl alloys, NiCoCrAlY coatings with different amounts of Sm2O3 were prepared by laser cladding on TiAl alloys. The microstructure and oxidation behavior of the coatings were investigated by isothermal oxidation tests at 900°C. The results indicated that the grains of the coatings were refined by Sm2O3. The fine grain reduced the crack sensitivity of the doped coatings and promoted the transformation of θ-Al2O3 to α-Al2O3. Therefore, the internal oxidation of the coatings and the growth rate of the oxide films were reduced. The segregation of Sm at grain boundary inhibited the outward diffusion of Ti, thus reducing the excessive oxidation of Ti. In addition, the oxidation mechanism of the coating was changed from simultaneous diffusion of Al and O to predominant inward diffusion of O. The oxidation resistance of the doped coatings was significantly improved. However, excessive Sm2O3 is detrimental to the improvement of the oxidation resistance. The oxidation resistance of 3 wt% Sm2O3 is the best.

show abstract

A review on molten sulfate salts induced hot corrosion

Cited by 58 publications

References 160 publications

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Research on Hot Corrosion Behavior of DZ40M and K452 Superalloys in NaCl Molten Salt

Hot Corrosion Behavior of TWAS and HVOF NiCr-Based Coatings in Molten Salt

Microstructure and Oxidation Behavior of NiCoCrAlY Coating With Different Sm2O3 Concentration on TiAl Alloy

Contact Info

Product

Resources

About