Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment

Teemu Sarikka, Risto Ilola, Rami Pohja, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Boiler and tubing materials used in biomass-fired energy production are susceptible to corrosion in severe corrosive environments caused by inorganic constituent such as chlorine at the operating temperatures. In conventional stainless steels, which rely on the formation of a chromia scale for protection against corrosion, the Cl present in the environment reacts with the Cr in the alloy to form volatile CrCl2 and CrCl3 compounds and, thus, reduces the formation of an external, stable chromia scale. The volatile CrCl2 and CrCl3 compounds formed on the surface of the alloy are not able to provide protection against further corrosion and due to the formation of these compounds the conventional stainless steels may lose their resistance to the Cl-containing environment. Alumina and silica forming alloys have been considered as possible solutions against corrosion in these types of applications. In this study, overlay weld coatings with FeCrAl and FeCrSi type consumables were manufactured on 10CrMo9-10 steel by gas-tungsten arc welding method. Kanthal A-1 with a nominal composition of 5.8 wt. % Al was chosen as an alumina-forming alloy and a silica-forming alloy was Fe-12Cr-2Si alloy with a nominal composition of 2.0 wt. % Si. Performance of the overlay coatings was tested in 168 h potassium chloride (KCl) exposure tests at 600°C in as-welded condition and after 24 h pre-oxidation at 950°C. Composition distributions of the coatings and the formed oxide layers in the KCl exposure were characterized with FEGSEM and EDS.
Original languageEnglish
Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts
EditorsPertti Auerkari, Juha Veivo
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages74
ISBN (Print)978-951-38-8029-3, 978-951-38-8030-9
Publication statusPublished - 2013
MoE publication typeNot Eligible
EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 11 Jun 201313 Jun 2013

Publication series

NameVTT Technology
PublisherVTT
Number107
ISSN (Print)2242-1211
ISSN (Electronic)2242-122X

Conference

ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period11/06/1313/06/13

Fingerprint

Corrosion resistance
Coatings
Aluminum Oxide
Stainless Steel
Corrosion
Silicon Dioxide
Chemical analysis
Caustics
Tungsten
Potassium Chloride
Steel
Chlorine
Electric arc welding
Corrosion protection
Tubing
Oxides
Boilers
Energy dispersive spectroscopy
Welds
Biomass

Cite this

Sarikka, T., Ilola, R., Pohja, R., & Hänninen, H. (2013). Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts (pp. 74). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 107
Sarikka, Teemu ; Ilola, Risto ; Pohja, Rami ; Hänninen, Hannu. / Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment. Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 74 (VTT Technology; No. 107).
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abstract = "Boiler and tubing materials used in biomass-fired energy production are susceptible to corrosion in severe corrosive environments caused by inorganic constituent such as chlorine at the operating temperatures. In conventional stainless steels, which rely on the formation of a chromia scale for protection against corrosion, the Cl present in the environment reacts with the Cr in the alloy to form volatile CrCl2 and CrCl3 compounds and, thus, reduces the formation of an external, stable chromia scale. The volatile CrCl2 and CrCl3 compounds formed on the surface of the alloy are not able to provide protection against further corrosion and due to the formation of these compounds the conventional stainless steels may lose their resistance to the Cl-containing environment. Alumina and silica forming alloys have been considered as possible solutions against corrosion in these types of applications. In this study, overlay weld coatings with FeCrAl and FeCrSi type consumables were manufactured on 10CrMo9-10 steel by gas-tungsten arc welding method. Kanthal A-1 with a nominal composition of 5.8 wt. {\%} Al was chosen as an alumina-forming alloy and a silica-forming alloy was Fe-12Cr-2Si alloy with a nominal composition of 2.0 wt. {\%} Si. Performance of the overlay coatings was tested in 168 h potassium chloride (KCl) exposure tests at 600°C in as-welded condition and after 24 h pre-oxidation at 950°C. Composition distributions of the coatings and the formed oxide layers in the KCl exposure were characterized with FEGSEM and EDS.",
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Sarikka, T, Ilola, R, Pohja, R & Hänninen, H 2013, Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 107, pp. 74, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment. / Sarikka, Teemu; Ilola, Risto; Pohja, Rami; Hänninen, Hannu.

Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 74 (VTT Technology; No. 107).

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment

AU - Sarikka, Teemu

AU - Ilola, Risto

AU - Pohja, Rami

AU - Hänninen, Hannu

N1 - Project code: 79889

PY - 2013

Y1 - 2013

N2 - Boiler and tubing materials used in biomass-fired energy production are susceptible to corrosion in severe corrosive environments caused by inorganic constituent such as chlorine at the operating temperatures. In conventional stainless steels, which rely on the formation of a chromia scale for protection against corrosion, the Cl present in the environment reacts with the Cr in the alloy to form volatile CrCl2 and CrCl3 compounds and, thus, reduces the formation of an external, stable chromia scale. The volatile CrCl2 and CrCl3 compounds formed on the surface of the alloy are not able to provide protection against further corrosion and due to the formation of these compounds the conventional stainless steels may lose their resistance to the Cl-containing environment. Alumina and silica forming alloys have been considered as possible solutions against corrosion in these types of applications. In this study, overlay weld coatings with FeCrAl and FeCrSi type consumables were manufactured on 10CrMo9-10 steel by gas-tungsten arc welding method. Kanthal A-1 with a nominal composition of 5.8 wt. % Al was chosen as an alumina-forming alloy and a silica-forming alloy was Fe-12Cr-2Si alloy with a nominal composition of 2.0 wt. % Si. Performance of the overlay coatings was tested in 168 h potassium chloride (KCl) exposure tests at 600°C in as-welded condition and after 24 h pre-oxidation at 950°C. Composition distributions of the coatings and the formed oxide layers in the KCl exposure were characterized with FEGSEM and EDS.

AB - Boiler and tubing materials used in biomass-fired energy production are susceptible to corrosion in severe corrosive environments caused by inorganic constituent such as chlorine at the operating temperatures. In conventional stainless steels, which rely on the formation of a chromia scale for protection against corrosion, the Cl present in the environment reacts with the Cr in the alloy to form volatile CrCl2 and CrCl3 compounds and, thus, reduces the formation of an external, stable chromia scale. The volatile CrCl2 and CrCl3 compounds formed on the surface of the alloy are not able to provide protection against further corrosion and due to the formation of these compounds the conventional stainless steels may lose their resistance to the Cl-containing environment. Alumina and silica forming alloys have been considered as possible solutions against corrosion in these types of applications. In this study, overlay weld coatings with FeCrAl and FeCrSi type consumables were manufactured on 10CrMo9-10 steel by gas-tungsten arc welding method. Kanthal A-1 with a nominal composition of 5.8 wt. % Al was chosen as an alumina-forming alloy and a silica-forming alloy was Fe-12Cr-2Si alloy with a nominal composition of 2.0 wt. % Si. Performance of the overlay coatings was tested in 168 h potassium chloride (KCl) exposure tests at 600°C in as-welded condition and after 24 h pre-oxidation at 950°C. Composition distributions of the coatings and the formed oxide layers in the KCl exposure were characterized with FEGSEM and EDS.

M3 - Conference abstract in proceedings

SN - 978-951-38-8029-3

SN - 978-951-38-8030-9

T3 - VTT Technology

SP - 74

BT - Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts

A2 - Auerkari, Pertti

A2 - Veivo, Juha

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Sarikka T, Ilola R, Pohja R, Hänninen H. Corrosion resistance of Kanthal A-1 and Fe-12Cr-2Si alloy coatings in Cl-containing environment. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants - Abstracts. Espoo: VTT Technical Research Centre of Finland. 2013. p. 74. (VTT Technology; No. 107).