Elevated-temperature corrosion of uncoated and aluminized 9–12% Cr boiler steels beneath KCl deposit

Metsäjoki, Jarkko; Huttunen-Saarivirta, Elina; Lepistö, Toivo

doi:10.1016/j.fuel.2014.05.017

Cited by 28 publications

(23 citation statements)

References 40 publications

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“…Generally, the results of the potentiodynamic polarization test indicate that deposition of the Al 2 O 3 ceramic film on the copper‐based heterostructured coating resulting in a sharp increase in the corrosion resistance of the system. The results of this study are also consistent with the results of Metsäjoki et al, Dejun et al, and Chen et al The researchers previously reported that the application of the aluminized layer on the steels resulted in their increased corrosion resistance.…”

Section: Resultssupporting

confidence: 92%

Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Sabzi

Dezfuli

2018

Int J Applied Ceramic Tech

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The effect of deposition of the Al2O3 ceramic film by the aluminizing method on electrochemical responses and corrosion mechanism of copper‐based heterostructured coatings was studied. The single layer coatings of Cu and Al2O3 and Cu/Al2O3 double layers were produced using reverse pulsed current electroplating process followed by powder cementation of aluminum on a substrate made of Inconel 600 superalloy. The produced coatings were then characterized using Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), and X‐ray Diffraction (XRD) methods. In order to evaluate the behavior and corrosion mechanism of the produced coatings, potentiodynamic polarization and electrochemical impedance spectroscopy methods were also used in 1 mol/L HCl solution at immersion times of 1, 12, 24, and 48 hours. The results of the study showed that the mechanism of the formation of Cu/Al2O3 copper‐based coatings is that in the aluminizing step, first, the diffusion of Al from the surface layers to the interior occurs and then the diffusion of Cu from the plating layer to the exterior takes places. It was also found that the deposition of the Al2O3 ceramic film resulted in the formation of α‐Al2O3 and CuAl2O4 phases and increased corrosion resistance in Cu/Al2O3 copper‐based coatings at all immersion times and the corrosion mechanism has changed from uniform to localized state.

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Section: Resultssupporting

confidence: 92%

Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Sabzi

Dezfuli

2018

Int J Applied Ceramic Tech

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“…The corrosion reactions on the AISI 4145 steel surface in Therminol 72 solution at elevated temperature can be described as follows [19,20]:…”

Section: Pitting Morphologies After Pitting Corrosion Test At Elevatementioning

confidence: 99%

Electrochemical and pitting corrosion resistance of AISI 4145 steel subjected to massive laser shock peening treatment with different coverage layers

Han

Cui

et al. 2017

Optics & Laser Technology

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The effects of massive laser shock peening (LSP) treatment with different coverage layers on residual stress, pitting morphologies in a standard corrosive solution and electrochemical corrosion resistance of AISI 4145 steel were investigated by pitting corrosion test, potentiodynamic polarisation test, and SEM observations. Results showed massive LSP treatment can effectively cause an obvious improvement of pitting corrosion resistance of AISI 4145 steel, and increased coverage layer can also gradually improve its corrosion resistance. Massive LSP treatment with multiple layers was shown to influence pitting corrosion behaviour in a standard corrosive solution.

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“…The corrosive species can occasionally diffuse through the oxide layer and cause depletion of these elements [21], based on well-stablished mechanisms of "chlorine-active corrosion" [22,23] or "electrochemistry" [24,25]. While several studies have been conducted to identify the mechanisms associated with alkali chloride-induced corrosion in case of bulk materials [26,27], a better understanding of the degradation of coatings containing different alloying elements is highly desired to enable their design for superior high temperature corrosion protection.…”

Section: Introductionmentioning

confidence: 99%

Influence of KCl and HCl on high temperature corrosion of HVAF-sprayed NiCrAlY and NiCrMo coatings

et al. 2018

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The oxidation performance of NiCrAlY and NiCrMo coatings thermally sprayed by high velocity airfuel (HVAF) technique has been investigated in a chloridizing-oxidizing environment, with and without a KCl deposit, at 600 °C for up to 168 h. Both coatings protected the substrate in the absence of KCl due to formation of a dense Cr-rich oxide scale. In the presence of KCl, Cl -/Cl2 diffused through a nonprotective and porous NiCr2O4 scale formed on NiCrAlY, leading to formation of volatile CrCl3. On the other hand, Mo in NiCrMo stimulated the formation of a more protective Cr-rich oxide scale which increased the corrosion resistance by reducing Cl -/Cl2 diffusion.

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Elevated-temperature corrosion of uncoated and aluminized 9–12% Cr boiler steels beneath KCl deposit

Cited by 28 publications

References 40 publications

Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Electrochemical and pitting corrosion resistance of AISI 4145 steel subjected to massive laser shock peening treatment with different coverage layers

Influence of KCl and HCl on high temperature corrosion of HVAF-sprayed NiCrAlY and NiCrMo coatings

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Elevated-temperature corrosion of uncoated and aluminized 9–12% Cr boiler steels beneath KCl deposit

Cited by 28 publications

References 40 publications

Deposition of Al2O3 ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Deposition of Al2O3 ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Electrochemical and pitting corrosion resistance of AISI 4145 steel subjected to massive laser shock peening treatment with different coverage layers

Influence of KCl and HCl on high temperature corrosion of HVAF-sprayed NiCrAlY and NiCrMo coatings

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Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating

Deposition of Al₂O₃ ceramic film on copper‐based heterostructured coatings by aluminizing process: Study of the electrochemical responses and corrosion mechanism of the coating