Corrosion behavior of Y-Al alloys in a H2/H2S/H2O gas mixture at 800-950°C

W. Kai; M. T. Chang; C. D. Liu; T. W. Lee

doi:10.1023/A:1015304505960

Corrosion behavior of Y-Al alloys in a H₂/H₂S/H₂O gas mixture at 800-950°C

W. Kai
, M. T. Chang
, C. D. Liu
, T. W. Lee

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

5 Citations (Scopus)

Abstract

The corrosion behavior of pure Y and two Y-Al alloys containing 5 and 10 wt.% Al was studied over the temperature range 800-950°C in a H₂/H₂S H₂O gas mixture. Both alloys had the two-phase structure of Y + Y₂Al With the exception of Y-10Al, for which a kinetics inversion was observed between 800°C and higher temperatures (T≥850°C), the parabolic rate constants generally increased with increasing temperature, but decreased with increasing Al content. The scales formed on pure Y and the Y-Al alloys were single but heterophasic, consisting of mostly Y₂O₃ and minor Y₂O₂S. XRD results showed no evidence of A1₂O₃ and pure sulfides. The formation of Y₂O₃ and Y₂O₂S on Y-10Al at 800°C resulted in a subsurface phase transformation from Y + Y₂Al to YAl₂ and broke the structural integrity of the scale, being responsible for the fast corrosion rate.

Original language	English
Pages (from-to)	523-547
Journal	Oxidation of Metals
Volume	57
Issue number	5-6
DOIs	https://doi.org/10.1023/A:1015304505960
Publication status	Published - Jun 2002
Externally published	Yes

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Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Research Keywords

Corrosion
Y-A1 alloys
Y2O2S
Y2O3

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10.1023/A:1015304505960

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@article{aa164d43af494ddbb926b1ec33d01efe,

title = "Corrosion behavior of Y-Al alloys in a H2/H2S/H2O gas mixture at 800-950°C",

abstract = "The corrosion behavior of pure Y and two Y-Al alloys containing 5 and 10 wt.\% Al was studied over the temperature range 800-950°C in a H2/H2S H2O gas mixture. Both alloys had the two-phase structure of Y + Y2Al With the exception of Y-10Al, for which a kinetics inversion was observed between 800°C and higher temperatures (T≥850°C), the parabolic rate constants generally increased with increasing temperature, but decreased with increasing Al content. The scales formed on pure Y and the Y-Al alloys were single but heterophasic, consisting of mostly Y2O3 and minor Y2O2S. XRD results showed no evidence of A12O3 and pure sulfides. The formation of Y2O3 and Y2O2S on Y-10Al at 800°C resulted in a subsurface phase transformation from Y + Y2Al to YAl2 and broke the structural integrity of the scale, being responsible for the fast corrosion rate.",

keywords = "Corrosion, Y-A1 alloys, Y2O2S, Y2O3",

author = "W. Kai and Chang, \{M. T.\} and Liu, \{C. D.\} and Lee, \{T. W.\}",

note = "Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].",

year = "2002",

month = jun,

doi = "10.1023/A:1015304505960",

language = "English",

volume = "57",

pages = "523--547",

journal = "Oxidation of Metals",

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TY - JOUR

T1 - Corrosion behavior of Y-Al alloys in a H2/H2S/H2O gas mixture at 800-950°C

AU - Kai, W.

AU - Chang, M. T.

AU - Liu, C. D.

AU - Lee, T. W.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2002/6

Y1 - 2002/6

N2 - The corrosion behavior of pure Y and two Y-Al alloys containing 5 and 10 wt.% Al was studied over the temperature range 800-950°C in a H2/H2S H2O gas mixture. Both alloys had the two-phase structure of Y + Y2Al With the exception of Y-10Al, for which a kinetics inversion was observed between 800°C and higher temperatures (T≥850°C), the parabolic rate constants generally increased with increasing temperature, but decreased with increasing Al content. The scales formed on pure Y and the Y-Al alloys were single but heterophasic, consisting of mostly Y2O3 and minor Y2O2S. XRD results showed no evidence of A12O3 and pure sulfides. The formation of Y2O3 and Y2O2S on Y-10Al at 800°C resulted in a subsurface phase transformation from Y + Y2Al to YAl2 and broke the structural integrity of the scale, being responsible for the fast corrosion rate.

AB - The corrosion behavior of pure Y and two Y-Al alloys containing 5 and 10 wt.% Al was studied over the temperature range 800-950°C in a H2/H2S H2O gas mixture. Both alloys had the two-phase structure of Y + Y2Al With the exception of Y-10Al, for which a kinetics inversion was observed between 800°C and higher temperatures (T≥850°C), the parabolic rate constants generally increased with increasing temperature, but decreased with increasing Al content. The scales formed on pure Y and the Y-Al alloys were single but heterophasic, consisting of mostly Y2O3 and minor Y2O2S. XRD results showed no evidence of A12O3 and pure sulfides. The formation of Y2O3 and Y2O2S on Y-10Al at 800°C resulted in a subsurface phase transformation from Y + Y2Al to YAl2 and broke the structural integrity of the scale, being responsible for the fast corrosion rate.

KW - Corrosion

KW - Y-A1 alloys

KW - Y2O2S

KW - Y2O3

UR - https://www.scopus.com/pages/publications/0042203801

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U2 - 10.1023/A:1015304505960

DO - 10.1023/A:1015304505960

M3 - RGC 21 - Publication in refereed journal

SN - 0030-770X

VL - 57

SP - 523

EP - 547

JO - Oxidation of Metals

JF - Oxidation of Metals

IS - 5-6

ER -