Impact of iron and chromium on coal ash corrosion behavior of Ni-Cr-Co based alloy for advanced ultra-supercritical power plants

Ya Xin Xu; Jin Tao Lu; Jin Yang Huang; Wen Ya Li; Jing Bo Yan; Xia Wei Yang; Lei Yao

doi:10.5006/2998

Impact of iron and chromium on coal ash corrosion behavior of Ni-Cr-Co based alloy for advanced ultra-supercritical power plants

Ya Xin Xu, Jin Tao Lu, Jin Yang Huang, Wen Ya Li, Jing Bo Yan, Xia Wei Yang, Lei Yao

School of Materials Sience and Engineering

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

5 Scopus citations

Abstract

The influence of alloyed iron and chromium on the coal ash corrosion behavior of Ni-Cr-Co based alloy was investigated at 800°C to 850°C. Results show that the alloyed iron accelerates the corrosion and alters the oxide scales by favoring the formation of Fe₂O₃ scale and the internal sulfides. As a contrast, the iron-free alloys grow mainly a Cr₂O₃ layer exhibiting lower corrosion rates. The temperature rising from 800°C to 850°C leads to the acceleration of corrosion in all cases. The increase in Cr content to 23 wt% is advantageous for the preferential oxidation of Cr and the retarding of Co and Al oxidation, which has a stronger impact at an elevated temperature of 850°C.

Original language	English
Pages (from-to)	1446-1456
Number of pages	11
Journal	Corrosion
Volume	74
Issue number	12
DOIs	https://doi.org/10.5006/2998
State	Published - Dec 2018

Keywords

Coal ash
Oxidation
Oxide scales
Sulfidation
Superalloy

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title = "Impact of iron and chromium on coal ash corrosion behavior of Ni-Cr-Co based alloy for advanced ultra-supercritical power plants",

abstract = "The influence of alloyed iron and chromium on the coal ash corrosion behavior of Ni-Cr-Co based alloy was investigated at 800°C to 850°C. Results show that the alloyed iron accelerates the corrosion and alters the oxide scales by favoring the formation of Fe2O3 scale and the internal sulfides. As a contrast, the iron-free alloys grow mainly a Cr2O3 layer exhibiting lower corrosion rates. The temperature rising from 800°C to 850°C leads to the acceleration of corrosion in all cases. The increase in Cr content to 23 wt% is advantageous for the preferential oxidation of Cr and the retarding of Co and Al oxidation, which has a stronger impact at an elevated temperature of 850°C.",

keywords = "Coal ash, Oxidation, Oxide scales, Sulfidation, Superalloy",

author = "Xu, {Ya Xin} and Lu, {Jin Tao} and Huang, {Jin Yang} and Li, {Wen Ya} and Yan, {Jing Bo} and Yang, {Xia Wei} and Lei Yao",

note = "Publisher Copyright: {\textcopyright} 2018 NACE International.",

year = "2018",

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doi = "10.5006/2998",

language = "英语",

volume = "74",

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TY - JOUR

T1 - Impact of iron and chromium on coal ash corrosion behavior of Ni-Cr-Co based alloy for advanced ultra-supercritical power plants

AU - Xu, Ya Xin

AU - Lu, Jin Tao

AU - Huang, Jin Yang

AU - Li, Wen Ya

AU - Yan, Jing Bo

AU - Yang, Xia Wei

AU - Yao, Lei

PY - 2018/12

Y1 - 2018/12

N2 - The influence of alloyed iron and chromium on the coal ash corrosion behavior of Ni-Cr-Co based alloy was investigated at 800°C to 850°C. Results show that the alloyed iron accelerates the corrosion and alters the oxide scales by favoring the formation of Fe2O3 scale and the internal sulfides. As a contrast, the iron-free alloys grow mainly a Cr2O3 layer exhibiting lower corrosion rates. The temperature rising from 800°C to 850°C leads to the acceleration of corrosion in all cases. The increase in Cr content to 23 wt% is advantageous for the preferential oxidation of Cr and the retarding of Co and Al oxidation, which has a stronger impact at an elevated temperature of 850°C.

AB - The influence of alloyed iron and chromium on the coal ash corrosion behavior of Ni-Cr-Co based alloy was investigated at 800°C to 850°C. Results show that the alloyed iron accelerates the corrosion and alters the oxide scales by favoring the formation of Fe2O3 scale and the internal sulfides. As a contrast, the iron-free alloys grow mainly a Cr2O3 layer exhibiting lower corrosion rates. The temperature rising from 800°C to 850°C leads to the acceleration of corrosion in all cases. The increase in Cr content to 23 wt% is advantageous for the preferential oxidation of Cr and the retarding of Co and Al oxidation, which has a stronger impact at an elevated temperature of 850°C.

KW - Coal ash

KW - Oxidation

KW - Oxide scales

KW - Sulfidation

KW - Superalloy

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DO - 10.5006/2998

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SN - 0010-9312

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IS - 12

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Impact of iron and chromium on coal ash corrosion behavior of Ni-Cr-Co based alloy for advanced ultra-supercritical power plants

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Keywords

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