External Α-Al2O3 scale on Ni-base alloy 602 CA. – Part I: Formation and long-term stability

A. Chyrkin; R. Pillai; T. Galiullin; E. Wessel; D. Grüner; W. J. Quadakkers

doi:10.1016/j.corsci.2017.05.017

External Α-Al₂O₃ scale on Ni-base alloy 602 CA. – Part I: Formation and long-term stability

A. Chyrkin, R. Pillai, T. Galiullin, E. Wessel, D. Grüner, W. J. Quadakkers

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22 Scopus citations

Abstract

A multi-step oxidation treatment was developed for the NiCrAl-base alloy 602 CA to promote the growth of protective α-Al₂O₃ scales during exposure at 1100–1200 °C in air. Above 1000 °C, the alloy forms external chromia scales accompanied by internal alumina precipitation. On the other hand, external alumina grows on alloy 602 CA surface at 800–900 °C. The alloy specimens were pre-oxidized at 800 °C to form the external α-Al₂O₃ scale and further exposed at 1100 and 1200 °C. The resulting oxide scales were characterized with SEM/EDX, EBSD, and TEM. The pre-grown alumina scale demonstrated good adherence, long-term stability and healing capability.

Original language	English
Pages (from-to)	138-149
Number of pages	12
Journal	Corrosion Science
Volume	124
DOIs	https://doi.org/10.1016/j.corsci.2017.05.017
State	Published - Aug 1 2017
Externally published	Yes

Keywords

Alumina
Chromia
Internal oxidation
Ni-base alloy
Oxidation resistance
Oxide scale
Pre-oxidation

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10.1016/j.corsci.2017.05.017

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title = "External Α-Al2O3 scale on Ni-base alloy 602 CA. – Part I: Formation and long-term stability",

abstract = "A multi-step oxidation treatment was developed for the NiCrAl-base alloy 602 CA to promote the growth of protective α-Al2O3 scales during exposure at 1100–1200 °C in air. Above 1000 °C, the alloy forms external chromia scales accompanied by internal alumina precipitation. On the other hand, external alumina grows on alloy 602 CA surface at 800–900 °C. The alloy specimens were pre-oxidized at 800 °C to form the external α-Al2O3 scale and further exposed at 1100 and 1200 °C. The resulting oxide scales were characterized with SEM/EDX, EBSD, and TEM. The pre-grown alumina scale demonstrated good adherence, long-term stability and healing capability.",

keywords = "Alumina, Chromia, Internal oxidation, Ni-base alloy, Oxidation resistance, Oxide scale, Pre-oxidation",

author = "A. Chyrkin and R. Pillai and T. Galiullin and E. Wessel and D. Gr{\"u}ner and Quadakkers, {W. J.}",

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T1 - External Α-Al2O3 scale on Ni-base alloy 602 CA. – Part I

T2 - Formation and long-term stability

AU - Chyrkin, A.

AU - Pillai, R.

AU - Galiullin, T.

AU - Wessel, E.

AU - Grüner, D.

AU - Quadakkers, W. J.

PY - 2017/8/1

Y1 - 2017/8/1

N2 - A multi-step oxidation treatment was developed for the NiCrAl-base alloy 602 CA to promote the growth of protective α-Al2O3 scales during exposure at 1100–1200 °C in air. Above 1000 °C, the alloy forms external chromia scales accompanied by internal alumina precipitation. On the other hand, external alumina grows on alloy 602 CA surface at 800–900 °C. The alloy specimens were pre-oxidized at 800 °C to form the external α-Al2O3 scale and further exposed at 1100 and 1200 °C. The resulting oxide scales were characterized with SEM/EDX, EBSD, and TEM. The pre-grown alumina scale demonstrated good adherence, long-term stability and healing capability.

AB - A multi-step oxidation treatment was developed for the NiCrAl-base alloy 602 CA to promote the growth of protective α-Al2O3 scales during exposure at 1100–1200 °C in air. Above 1000 °C, the alloy forms external chromia scales accompanied by internal alumina precipitation. On the other hand, external alumina grows on alloy 602 CA surface at 800–900 °C. The alloy specimens were pre-oxidized at 800 °C to form the external α-Al2O3 scale and further exposed at 1100 and 1200 °C. The resulting oxide scales were characterized with SEM/EDX, EBSD, and TEM. The pre-grown alumina scale demonstrated good adherence, long-term stability and healing capability.

KW - Alumina

KW - Chromia

KW - Internal oxidation

KW - Ni-base alloy

KW - Oxidation resistance

KW - Oxide scale

KW - Pre-oxidation

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VL - 124

SP - 138

EP - 149

JO - Corrosion Science

JF - Corrosion Science

ER -

External Α-Al₂O₃ scale on Ni-base alloy 602 CA. – Part I: Formation and long-term stability

Abstract

Keywords

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