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Effect of Alloying Chemistry on Fireside Corrosion Behavior of Ni–Fe-Based Superalloy for Ultra-supercritical Boiler Applications

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Abstract

The fireside corrosion behavior of a group of nickel–iron-based superalloys was studied in the presence of a mixture of synthetic alkali sulfates and oxides, and a sulfur dioxide/sulfur trioxide-containing mixed gas. The formation and growth kinetics of corrosion scale was sensitive to alloy composition. The chromium content was key to corrosion, levels that approached 25 wt% improved the oxide film integrity, and chromium was consumed continuously during hot exposure. A higher aluminum content reduced the oxide film integrity by slagging of combustion products. Silicon content has a small effect on alloy corrosion resistance, but a sample alloy without silicon corroded catastrophically. Tungsten and molybdenum accelerated oxide film spallation. Corrosion products on the sample surfaces consisted mainly of a protective chromium oxide film. Internal aluminum- and titanium-rich oxide particles with different content existed in the sample alloys. The synergistic effect of anti-corrosion elements against fireside corrosion was discussed.

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Acknowledgements

The authors would like to gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (Grant Numbers 51301163 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 & D Center of Clean and High-Efficiency Fossil-Fired Power Generation Technology, Xi’an Thermal Power Research Institute Co., Ltd., Xinqing Road No. 136, Xi’an, 710032, China

    Jintao Lu, Zhen Yang, Jinyang Huang, Xinbao Zhao & Yong Yuan

  2. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Yan Li

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  1. Jintao Lu
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  2. Zhen Yang
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  3. Yan Li
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  5. Xinbao Zhao
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Correspondence to Jintao Lu.

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Lu, J., Yang, Z., Li, Y. et al. Effect of Alloying Chemistry on Fireside Corrosion Behavior of Ni–Fe-Based Superalloy for Ultra-supercritical Boiler Applications. Oxid Met 89, 609–621 (2018). https://doi.org/10.1007/s11085-017-9804-7

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  • DOI: https://doi.org/10.1007/s11085-017-9804-7

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