KCl-induced high temperature corrosion of selected commercial alloys. Part I: chromia-formers

Saeed Kiamehr, Kristian Vinter Dahl, Melanie Montgomery, Marcel A. J. Somers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Laboratory testing of selected chromia-forming alloys was performed to rank the materials and gain further knowledge on the mechanism of KCl-induced high temperature corrosion. The investigated alloys were stainless steels EN1.4021, EN1.4057, EN1.4521, TP347H (coarse-grained), TP347HFG (fine-grained), Sanicro 28 and the nickel-based alloys 625, 263 and C276. Exposure was performed at 600 °C for 168 h in flowing N2(g)+5%O2(g)+15% H2O(g) (vol.%). Samples were covered with KCl powder prior to exposure. A salt-free exposure was also performed for comparison. Corrosion morphology and products were studied with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). It was observed that in the salt-free exposure, stainless steels TP347H (coarse-grained) and EN1.4521 failed to form a thin protective oxide layer compared to the oxide formed on the other alloys. In the presence of solid KCl, all the alloys showed significant corrosion. Measurement of corrosion extent indicated that alloys EN1.4057, Sanicro 28 and 625 show a better performance compared to the industrial state of the art material TP347HFG under laboratory conditions. An additional test was performed with KCl vapor in static air for the same duration and at the same temperature. This was undertaken to investigate the role of the vapor phase and revealed that KCl vapor at 600 °C can initiate attack.
Original languageEnglish
JournalMaterials and Corrosion
Volume66
Issue number12
Pages (from-to)1414-1429
ISSN0947-5117
DOIs
Publication statusPublished - 2015

Keywords

  • Al2O3
  • Anatase
  • Coatings
  • Interfaces
  • Photoabsorption
  • Photocatalytic activity
  • Photoelectrochemistry
  • TiO2

Cite this

@article{f3993768496e402cb0bfb43d07ea63b5,
title = "KCl-induced high temperature corrosion of selected commercial alloys. Part I: chromia-formers",
abstract = "Laboratory testing of selected chromia-forming alloys was performed to rank the materials and gain further knowledge on the mechanism of KCl-induced high temperature corrosion. The investigated alloys were stainless steels EN1.4021, EN1.4057, EN1.4521, TP347H (coarse-grained), TP347HFG (fine-grained), Sanicro 28 and the nickel-based alloys 625, 263 and C276. Exposure was performed at 600 °C for 168 h in flowing N2(g)+5{\%}O2(g)+15{\%} H2O(g) (vol.{\%}). Samples were covered with KCl powder prior to exposure. A salt-free exposure was also performed for comparison. Corrosion morphology and products were studied with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). It was observed that in the salt-free exposure, stainless steels TP347H (coarse-grained) and EN1.4521 failed to form a thin protective oxide layer compared to the oxide formed on the other alloys. In the presence of solid KCl, all the alloys showed significant corrosion. Measurement of corrosion extent indicated that alloys EN1.4057, Sanicro 28 and 625 show a better performance compared to the industrial state of the art material TP347HFG under laboratory conditions. An additional test was performed with KCl vapor in static air for the same duration and at the same temperature. This was undertaken to investigate the role of the vapor phase and revealed that KCl vapor at 600 °C can initiate attack.",
keywords = "Al2O3, Anatase, Coatings, Interfaces, Photoabsorption, Photocatalytic activity, Photoelectrochemistry, TiO2",
author = "Saeed Kiamehr and Dahl, {Kristian Vinter} and Melanie Montgomery and Somers, {Marcel A. J.}",
year = "2015",
doi = "10.1002/maco.201408213",
language = "English",
volume = "66",
pages = "1414--1429",
journal = "Materials and Corrosion",
issn = "0947-5117",
publisher = "Wiley - V C H Verlag GmbH & Co. KGaA",
number = "12",

}

KCl-induced high temperature corrosion of selected commercial alloys. Part I: chromia-formers. / Kiamehr, Saeed; Dahl, Kristian Vinter; Montgomery, Melanie; Somers, Marcel A. J.

In: Materials and Corrosion, Vol. 66, No. 12, 2015, p. 1414-1429.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - KCl-induced high temperature corrosion of selected commercial alloys. Part I: chromia-formers

AU - Kiamehr, Saeed

AU - Dahl, Kristian Vinter

AU - Montgomery, Melanie

AU - Somers, Marcel A. J.

PY - 2015

Y1 - 2015

N2 - Laboratory testing of selected chromia-forming alloys was performed to rank the materials and gain further knowledge on the mechanism of KCl-induced high temperature corrosion. The investigated alloys were stainless steels EN1.4021, EN1.4057, EN1.4521, TP347H (coarse-grained), TP347HFG (fine-grained), Sanicro 28 and the nickel-based alloys 625, 263 and C276. Exposure was performed at 600 °C for 168 h in flowing N2(g)+5%O2(g)+15% H2O(g) (vol.%). Samples were covered with KCl powder prior to exposure. A salt-free exposure was also performed for comparison. Corrosion morphology and products were studied with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). It was observed that in the salt-free exposure, stainless steels TP347H (coarse-grained) and EN1.4521 failed to form a thin protective oxide layer compared to the oxide formed on the other alloys. In the presence of solid KCl, all the alloys showed significant corrosion. Measurement of corrosion extent indicated that alloys EN1.4057, Sanicro 28 and 625 show a better performance compared to the industrial state of the art material TP347HFG under laboratory conditions. An additional test was performed with KCl vapor in static air for the same duration and at the same temperature. This was undertaken to investigate the role of the vapor phase and revealed that KCl vapor at 600 °C can initiate attack.

AB - Laboratory testing of selected chromia-forming alloys was performed to rank the materials and gain further knowledge on the mechanism of KCl-induced high temperature corrosion. The investigated alloys were stainless steels EN1.4021, EN1.4057, EN1.4521, TP347H (coarse-grained), TP347HFG (fine-grained), Sanicro 28 and the nickel-based alloys 625, 263 and C276. Exposure was performed at 600 °C for 168 h in flowing N2(g)+5%O2(g)+15% H2O(g) (vol.%). Samples were covered with KCl powder prior to exposure. A salt-free exposure was also performed for comparison. Corrosion morphology and products were studied with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). It was observed that in the salt-free exposure, stainless steels TP347H (coarse-grained) and EN1.4521 failed to form a thin protective oxide layer compared to the oxide formed on the other alloys. In the presence of solid KCl, all the alloys showed significant corrosion. Measurement of corrosion extent indicated that alloys EN1.4057, Sanicro 28 and 625 show a better performance compared to the industrial state of the art material TP347HFG under laboratory conditions. An additional test was performed with KCl vapor in static air for the same duration and at the same temperature. This was undertaken to investigate the role of the vapor phase and revealed that KCl vapor at 600 °C can initiate attack.

KW - Al2O3

KW - Anatase

KW - Coatings

KW - Interfaces

KW - Photoabsorption

KW - Photocatalytic activity

KW - Photoelectrochemistry

KW - TiO2

U2 - 10.1002/maco.201408213

DO - 10.1002/maco.201408213

M3 - Journal article

VL - 66

SP - 1414

EP - 1429

JO - Materials and Corrosion

JF - Materials and Corrosion

SN - 0947-5117

IS - 12

ER -