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Corrosion Behavior of Candidate Materials Used for Urea Hydrolysis Equipment in Coal-Fired Selective Catalytic Reduction Units

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Abstract

Corrosion tests were performed in the laboratory in order to assess the corrosion resistance of candidate materials used in urea hydrolysis equipment. The materials to be evaluated were exposed at 145 °C for 1000 h. Alloys 316L, 316L Mod., HR3C, Inconel 718, and TC4 were evaluated. Additionally, aluminide and chromate coatings applied to a 316L substrate were examined. After exposure, the mass changes in the test samples were measured by a discontinuous weighing method, and the morphologies, compositions, and phases of the corrosion products were analyzed using scanning electron microscopy, energy-dispersive spectroscopy, and x-ray diffraction. Results indicated that continuous pitting and dissolution corrosion were the main failure modes for 316L stainless steel. 316L Mod. and HR3C alloy showed better corrosion resistance than 316L due to their relatively high Cr contents, but HR3C exhibited a strong tendency toward intergranular corrosion. Inconel 718, TC4, and aluminide and chromate coating samples showed similar corrosion processes: only depositions formed by hydrothermal reactions were observed. Based on these results, a possible corrosion process in the urea hydrolysis environment was discussed for these candidate materials and questions to be clarified were proposed.

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Acknowledgments

The authors would like to gratefully acknowledge the financial supported by the National Natural Science Foundation (51301130), (51401163). Part of the funding was provided by the research program of 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., Xingqing Road No. 136, Xi’an, 710032, China

    Jintao Lu, Zhen Yang, Bo Zhang, Jinyang Huang & Hongjie Xu

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  1. Jintao Lu
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  2. Zhen Yang
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  5. Hongjie Xu
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Correspondence to Jintao Lu.

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Lu, J., Yang, Z., Zhang, B. et al. Corrosion Behavior of Candidate Materials Used for Urea Hydrolysis Equipment in Coal-Fired Selective Catalytic Reduction Units. J. of Materi Eng and Perform 27, 3290–3296 (2018). https://doi.org/10.1007/s11665-017-3001-3

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  • DOI: https://doi.org/10.1007/s11665-017-3001-3

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