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Effect of Cobalt Content on the Oxidation and Corrosion Behavior of Ni–Fe-Based Superalloy for Ultra-Supercritical Boiler Applications

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Abstract

The oxidation and corrosion behavior of three model alloys with different cobalt contents (6–20 wt%) were investigated in static air and a simulated coal ash/gas environment at 750 °C. The model alloys follow a parabolic law approximately during the oxidation in static air. High cobalt level improves the oxidation resistance, however, without noticeable improvement in coal ash/gas corrosion resistance. The sample with the highest cobalt content grows the thinnest oxide layer and the fewest internal oxidation products in the oxidation test. Cobalt in the model alloys promotes the establishment of a protective chromium oxide scale during the oxidation test, but did not show much difference in restraining the inward diffusion of sulfur by increasing its content. The oxidation and corrosion products formed on the sample surface consist mainly of a protective chromium oxide film. Internal aluminum oxide particles have been found especially along the grain boundaries of the base alloy.

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Acknowledgements

The authors would like to gratefully acknowledge the financial support provided by the National Natural Science Foundation (Grant numbers 51401163 and 51401164). Part of the funding was provided by the research program of the China Huaneng Group.

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Authors and Affiliations

  1. National Energy R and D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology, Xi’an Thermal Power Research Institute Co., Ltd, Xingqing Road No. 136, Xi′an, 710032, China

    Jintao Lu, Jinyang Huang, Zhen Yang, Yongli Zhou, Yingying Dang, Xinbao Zhao & Yong Yuan

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  1. Jintao Lu
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  2. Jinyang Huang
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  4. Yongli Zhou
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  6. Xinbao Zhao
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  7. Yong Yuan
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Correspondence to Jintao Lu.

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Lu, J., Huang, J., Yang, Z. et al. Effect of Cobalt Content on the Oxidation and Corrosion Behavior of Ni–Fe-Based Superalloy for Ultra-Supercritical Boiler Applications. Oxid Met 89, 197–209 (2018). https://doi.org/10.1007/s11085-017-9783-8

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  • DOI: https://doi.org/10.1007/s11085-017-9783-8

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