Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour

Hui Mei; Yanan Liu; Laifei Cheng; Litong Zhang

doi:10.1016/j.corsci.2011.10.021

Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour

Hui Mei, Yanan Liu, Laifei Cheng, Litong Zhang

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

A mechanism of corrosion is proposed relating to a NiCoCrAlTaY coated Mar-M247 superalloy exposure in molten Na ₂SO ₄ salt vapour at 900°C. The corrosion process indicates the parabolic "diffusion controlled" region I at rate of 4.6×10 ^-6mg ²cm ^-4s ^-1, the combination of parabolic and linear "reaction-diffusion controlled" region II at rate of 2.28×10 ^-5mg ²cm ^-4s ^-1 and 4.35×10 ^-5mgcm ^-2s ^-1, and finally the complete "reaction controlled" region III at the same rate of 3.92×10 ^-4mgcm ^-2s ^-1 as the uncoated superalloy. The corrosion kinetics of each region and of the whole process are formulated rationally associated with the corrosion mechanism.

Original language	English
Pages (from-to)	201-204
Number of pages	4
Journal	Corrosion Science
Volume	55
DOIs	https://doi.org/10.1016/j.corsci.2011.10.021
State	Published - Feb 2012

Keywords

A. Metal coatings
A. Molten salts
A. Superalloys
B. Weight loss
C. Hot corrosion

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10.1016/j.corsci.2011.10.021

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title = "Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour",

abstract = "A mechanism of corrosion is proposed relating to a NiCoCrAlTaY coated Mar-M247 superalloy exposure in molten Na 2SO 4 salt vapour at 900°C. The corrosion process indicates the parabolic {"}diffusion controlled{"} region I at rate of 4.6×10 -6mg 2cm -4s -1, the combination of parabolic and linear {"}reaction-diffusion controlled{"} region II at rate of 2.28×10 -5mg 2cm -4s -1 and 4.35×10 -5mgcm -2s -1, and finally the complete {"}reaction controlled{"} region III at the same rate of 3.92×10 -4mgcm -2s -1 as the uncoated superalloy. The corrosion kinetics of each region and of the whole process are formulated rationally associated with the corrosion mechanism.",

keywords = "A. Metal coatings, A. Molten salts, A. Superalloys, B. Weight loss, C. Hot corrosion",

author = "Hui Mei and Yanan Liu and Laifei Cheng and Litong Zhang",

year = "2012",

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doi = "10.1016/j.corsci.2011.10.021",

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volume = "55",

pages = "201--204",

journal = "Corrosion Science",

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T1 - Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour

AU - Mei, Hui

AU - Liu, Yanan

AU - Cheng, Laifei

AU - Zhang, Litong

PY - 2012/2

Y1 - 2012/2

N2 - A mechanism of corrosion is proposed relating to a NiCoCrAlTaY coated Mar-M247 superalloy exposure in molten Na 2SO 4 salt vapour at 900°C. The corrosion process indicates the parabolic "diffusion controlled" region I at rate of 4.6×10 -6mg 2cm -4s -1, the combination of parabolic and linear "reaction-diffusion controlled" region II at rate of 2.28×10 -5mg 2cm -4s -1 and 4.35×10 -5mgcm -2s -1, and finally the complete "reaction controlled" region III at the same rate of 3.92×10 -4mgcm -2s -1 as the uncoated superalloy. The corrosion kinetics of each region and of the whole process are formulated rationally associated with the corrosion mechanism.

AB - A mechanism of corrosion is proposed relating to a NiCoCrAlTaY coated Mar-M247 superalloy exposure in molten Na 2SO 4 salt vapour at 900°C. The corrosion process indicates the parabolic "diffusion controlled" region I at rate of 4.6×10 -6mg 2cm -4s -1, the combination of parabolic and linear "reaction-diffusion controlled" region II at rate of 2.28×10 -5mg 2cm -4s -1 and 4.35×10 -5mgcm -2s -1, and finally the complete "reaction controlled" region III at the same rate of 3.92×10 -4mgcm -2s -1 as the uncoated superalloy. The corrosion kinetics of each region and of the whole process are formulated rationally associated with the corrosion mechanism.

KW - A. Metal coatings

KW - A. Molten salts

KW - A. Superalloys

KW - B. Weight loss

KW - C. Hot corrosion

UR - http://www.scopus.com/inward/record.url?scp=83555165911&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2011.10.021

DO - 10.1016/j.corsci.2011.10.021

M3 - 文章

AN - SCOPUS:83555165911

SN - 0010-938X

VL - 55

SP - 201

EP - 204

JO - Corrosion Science

JF - Corrosion Science

ER -

Corrosion mechanism of a NiCoCrAlTaY coated Mar-M247 superalloy in molten salt vapour

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Keywords

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