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Effects of External Stress on High-Temperature Corrosion Behavior of T92 Ferrite Steel with Na2SO4-K2SO4 Molten Salts

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Abstract

This paper reports an experimental study of the oxidation–sulfidation behavior of T92 steel in a complex environment consisting of a combination of high temperature (700 °C), SO2, molten sulfate salts, and applied stresses. The corrosion products, morphologies, and element distributions of corrosion scales were investigated in detail by SEM and XRD. Results indicate that the formation of sulfides in the deep layer where the p(O2) is low-level prevents the reformation of a protective layer after the damage of the Cr2O3 layer. It is also noted that based on the data of maximum corrosion depth, when stresses are applied, the extent of corrosion had been alleviated, which is ascribed to that the applied stress also accelerated the fast formation of Cr2O3. However, the applied stress is also thought to accelerate the damage of the protective layer by inducing more boundaries of products and increasing the possibility of exfoliation of a corrosion scale. Thus, in the limited exposure duration to the corrosive environment in this study, there should be a “critical stress” under which the specimens present the best corrosion resistance.

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Acknowledgements

This work is supported by the National Key Research and Development Program of China (No. 2016YFC0801904), the Program for New Century Excellent Talents in the University of Ministry of Education of China (NCET-13–0468), and the Fundamental Research Funds for the Central Universities in Xi'an Jiaotong University. In this study, the authors listed at the beginning all did many efforts. Zhuhan Liu completed the experiments and write this paper with the help of Zhiyuan Ning. And Na Li and Mr. Zhou gave us instructions on how to analyze the dates. Taisheng Liu offered the experimental materials as well as some equipment. In the preparation for the revised paper, Zhiyuan Ning gave us many suggestions and help to revise the paper.

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Authors and Affiliations

  1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China

    Zhuhan Liu, Zhiyuan Ning, Qulan Zhou & Na Li

  2. Key Laboratory for Clean Combustion and Flue Gas Purification of Sichuan Province, Chengdu, 610036, China

    Taisheng Liu

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  1. Zhuhan Liu
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  2. Zhiyuan Ning
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  4. Na Li
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Correspondence to Na Li.

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Liu, Z., Ning, Z., Zhou, Q. et al. Effects of External Stress on High-Temperature Corrosion Behavior of T92 Ferrite Steel with Na2SO4-K2SO4 Molten Salts. Oxid Met 97, 141–155 (2022). https://doi.org/10.1007/s11085-021-10084-1

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