KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

Israelsson, Niklas; Engkvist, Josefin; Hellström, Kristina; Halvarsson, Mats; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar

doi:10.1007/s11085-014-9507-2

Cited by 47 publications

(44 citation statements)

References 30 publications

(49 reference statements)

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“…While the surface between the salt particles appears to be free from KCl, it was shown previously [17,20] that small amounts of KCl were present also in these areas. The alumina scales formed during 1 h pre-oxidation at 900°C failed during the first corrosion exposure (Fig.…”

Section: Resultsmentioning

confidence: 82%

“…N 2 ? H 2 O environment at 600°C causes rapid corrosion of the FeCrAl alloys Kanthal Ò APMT and AF [15][16][17]. In other words in the presence of KCl, the normally protective and alumina-rich external oxide was replaced with a rapidly growing iron-rich scale, and the two FeCrAl alloys behaved similar to FeCrNi alloys in the same environment [10].…”

Section: Discussionmentioning

confidence: 99%

“…The needlelike nitride precipitates were analysed in detail in [15] and it was concluded that they consisted of AlN. Nitridation of the investigated alloy was not detected in the absence of KCl [17]. Nitridation implies that the oxide scale is permeable to N 2 molecules.…”

Section: Nitridationmentioning

confidence: 99%

“…Previously, crystalline KAlSiO 4 was identified on Kanthal Ò APMT after pre-oxidizing at 700°C for 24 h in O 2 and then exposed to an O 2 ? H 2 O environment in the presence of KCl at 600°C [17]. The observation that the KCl-induced corrosion of the pre-oxidized samples always began at the sample edges prompted an investigation of the alumina scale formed by pre-oxidation for 24 h at 1,100°C.…”

Section: µMmentioning

confidence: 99%

“…N 2 ? H 2 O environment at 600°C cause rapid corrosion of the FeCrAl alloys Kanthal Ò APMT and AF [15][16][17]. The aim of this study is to use pre-formed alumina scales prior to exposure to the KCl-containing environment in order to mitigate the corrosion.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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The KCl-induced corrosion of the FeCrAl alloy Kanthal Ò APMT in an O 2 ? N 2 ? H 2 O environment was studied at 600°C. The samples were pre-oxidized prior to exposure in order to investigate the protective nature of alumina scales in the present environment. The microstructure and composition of the corroded surface was investigated in detail. Corrosion started at flaws in the pre-formed a-alumina scales, i.e. a-alumina was protective in itself. Consequently, KCl-induced corrosion started locally and, subsequently, spread laterally. An electrochemical mechanism is proposed here by which a transition metal chloride forms in the alloy and K 2 CrO 4 forms at the scale/gas interface. Scale de-cohesion is attributed to the formation of a sub-scale transition metal chloride.

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Section: Resultsmentioning

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Nitridationmentioning

confidence: 99%

Section: µMmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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Early stage oxidation behavior of Al‐ and Si‐alloyed stainless steels as well as Ni‐based alloys in air at elevated temperatures

Romu

Sarikka

Heikkilä

et al. 2018

Materials & Corrosion

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Several alloys including Al‐alloyed austenitic and ferritic stainless steels, Ni‐based alloy and Si‐alloyed ferritic stainless steel were annealed at 550, 750, and 950 °C for up to 700 h. AISI 347HFG and 10CrMo910 were used as reference materials. Weight gain was measured and the samples were analyzed with SEM/EDS and XRD. Materials having high enough Al‐content performed best due to ability to form a continuous protective Al2O3‐oxide layer on their surface at elevated temperatures. Lower Al‐content materials were not able to form a continuous protective Al‐oxide on their surface and suffered from accelerated internal Al‐oxide formation due to alloying elements. Si‐alloying improves the oxidation resistance of the studied materials and their performance was practically in the same level as that of the best Al‐alloyed materials. In Al‐alloyed materials the crystallinity of Al2O3 on ferritic stainless steel weld metal was higher than that on welded and wrought austenitic stainless steels.

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Influence of Al content and low oxygen pressure preoxidation on high‐temperature oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y alloys

Wang

Zhu

et al. 2022

Materials & Corrosion

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The influence of Al content and low oxygen pressure preoxidation on the high‐temperature oxidation resistance of the Ni–25Cr–xAl–1Si–0.5Y (x = 0, 1, 3, 5 wt%) alloys were studied. The formation of oxides in low oxygen pressure preoxidation was investigated. The oxidation behavior of alloys with different Al content at 1000°C with and without preoxidation under low oxygen pressure was discussed. A protective oxide film was formed on the surface of alloys with different Al content in low oxygen pressure pre‐oxidation at 950°C for 5 h, but there were great differences in microstructures and properties. With the increase of Al content, the outermost oxide film of the alloy gradually changed from continuous Cr2O3 to Al2O3, and the oxidation resistance of the alloy increased gradually at 1000°C. By comparison, the oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y (x = 0, 1, 3, 5 wt%) alloys can be significantly improved at 1000°C by low oxygen pressure preoxidation treatment.

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KCl-Induced Corrosion of an FeCrAl Alloy at 600 °C in O2 + H2O Environment: The Effect of Pre-oxidation

Cited by 47 publications

References 30 publications

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Early stage oxidation behavior of Al‐ and Si‐alloyed stainless steels as well as Ni‐based alloys in air at elevated temperatures

Influence of Al content and low oxygen pressure preoxidation on high‐temperature oxidation resistance of Ni–25Cr–xAl–1Si–0.5Y alloys

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