Application of aluminum diffusion coatings to mitigate the KCl-induced high-temperature corrosion

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Abstract

Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic-martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high-temperature corrosion induced by potassium chloride (KCl) was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. In addition, a salt-free experiment was performed for comparison. Microstructure, chemical and phase composition of the samples were analyzed with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD) before and after the exposures. It was found that all the diffusion coatings formed protective oxides under salt-free exposure in air. Under the salt deposit, Fe1−xAl showed local failure while on large parts of the sample a protective layer had formed. Fe2Al5 was attacked over the entire surface and the dominant mode of attack was selective aluminum removal. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.
Original languageEnglish
JournalMaterials and Corrosion
Volume68
Issue number1
Pages (from-to)82–94
Number of pages13
ISSN0947-5117
DOIs
Publication statusPublished - 2017

Cite this

@article{ba0cc8e52b3944579cf4bcc2627cba8c,
title = "Application of aluminum diffusion coatings to mitigate the KCl-induced high-temperature corrosion",
abstract = "Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic-martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high-temperature corrosion induced by potassium chloride (KCl) was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. In addition, a salt-free experiment was performed for comparison. Microstructure, chemical and phase composition of the samples were analyzed with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD) before and after the exposures. It was found that all the diffusion coatings formed protective oxides under salt-free exposure in air. Under the salt deposit, Fe1−xAl showed local failure while on large parts of the sample a protective layer had formed. Fe2Al5 was attacked over the entire surface and the dominant mode of attack was selective aluminum removal. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.",
author = "Saeed Kiamehr and Lomholt, {T. N.} and Dahl, {Kristian Vinter} and Christiansen, {Thomas Lundin} and Somers, {Marcel A. J.}",
year = "2017",
doi = "10.1002/maco.201609047",
language = "English",
volume = "68",
pages = "82–94",
journal = "Materials and Corrosion",
issn = "0947-5117",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "1",

}

Application of aluminum diffusion coatings to mitigate the KCl-induced high-temperature corrosion. / Kiamehr, Saeed; Lomholt, T. N.; Dahl, Kristian Vinter; Christiansen, Thomas Lundin; Somers, Marcel A. J.

In: Materials and Corrosion, Vol. 68, No. 1, 2017, p. 82–94.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Application of aluminum diffusion coatings to mitigate the KCl-induced high-temperature corrosion

AU - Kiamehr, Saeed

AU - Lomholt, T. N.

AU - Dahl, Kristian Vinter

AU - Christiansen, Thomas Lundin

AU - Somers, Marcel A. J.

PY - 2017

Y1 - 2017

N2 - Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic-martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high-temperature corrosion induced by potassium chloride (KCl) was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. In addition, a salt-free experiment was performed for comparison. Microstructure, chemical and phase composition of the samples were analyzed with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD) before and after the exposures. It was found that all the diffusion coatings formed protective oxides under salt-free exposure in air. Under the salt deposit, Fe1−xAl showed local failure while on large parts of the sample a protective layer had formed. Fe2Al5 was attacked over the entire surface and the dominant mode of attack was selective aluminum removal. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.

AB - Pack cementation was used to produce Fe1−xAl and Fe2Al5 diffusion coatings on ferritic-martensitic steel P91 and a Ni2Al3 diffusion coating on pure nickel. The performance of diffusion coatings against high-temperature corrosion induced by potassium chloride (KCl) was evaluated by exposing the samples at 600 °C for 168 h in static lab air under KCl deposit. In addition, a salt-free experiment was performed for comparison. Microstructure, chemical and phase composition of the samples were analyzed with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD) before and after the exposures. It was found that all the diffusion coatings formed protective oxides under salt-free exposure in air. Under the salt deposit, Fe1−xAl showed local failure while on large parts of the sample a protective layer had formed. Fe2Al5 was attacked over the entire surface and the dominant mode of attack was selective aluminum removal. Ni2Al3 showed excellent performance and no sign of attack was observed anywhere on the sample.

U2 - 10.1002/maco.201609047

DO - 10.1002/maco.201609047

M3 - Journal article

VL - 68

SP - 82

EP - 94

JO - Materials and Corrosion

JF - Materials and Corrosion

SN - 0947-5117

IS - 1

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