Impact of Iron and Chromium on Coal Ash Corrosion Behavior of Ni-Cr-Co Based Alloy for Advanced Ultra-Supercritical Power Plants

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...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2018-12, Vol.74 (12), p.1446-1456
Main Authors: Xu, Ya-Xin, Lu, Jin-Tao, Huang, Jin-Yang, Li, Wen-Ya, Yan, Jing-Bo, Yang, Xia-Wei, Yao, Lei
Format: Article
Language:English
Subjects:
Alloying
Boilers
Chromium
Coal
Cobalt
Corrosion
Corrosion rate
Corrosion resistance
Corrosion tests
Electric power generation
Ferric oxide
Fly ash
Gases
Heat
High temperature
Iron
Iron alloys
Nickel base alloys
Oxidation
Power plants
Scale (corrosion)
Temperature
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Summary: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 ofcorrosion 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.
ISSN:0010-9312
1938-159X
DOI:10.5006/2998