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Hot Corrosion Behavior of Arc-Sprayed Highly Dense NiCr-Based Coatings in Chloride Salt Deposit

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Abstract

To make cities more environmentally friendly, combustible wastes tend to be incinerated in waste-to-energy power plant boilers. However, release of chlorine gas (Cl2) during incineration causes serious problems related to hot corrosion of boiler tubes and poses a safety threat for such plants. In this study, a pseudo-de Laval nozzle was employed in a twin-wire arc spray system to enhance the velocity of in-flight particles. Highly dense NiCr-based coatings were obtained using the modified nozzle gun. The coating morphology was characterized by optical microscopy and scanning electron microscopy, and hot corrosion testing was carried out in a synthetic molten chloride salt environment. Results showed that the dense NiCr-based coatings exhibited high resistance against corrosion by chlorine, which can be related to the typical splat lamellar microstructure and chemical composition as well as minor alloying elements such as Ti and Mo.

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Acknowledgments

The authors gratefully thank Ms. Y. Liu for help with SEM and XRD tests and Mr. C.B. Zou for help with spraying coating samples. The authors are also grateful for fruitful discussions with Dr. R. Balijepalli (Max Plank Institute for Iron Research GmbH) and Prof. D. L. Zhang (Northeastern University China).

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Authors and Affiliations

  1. Suzhou Nuclear Power Research Institute, Suzhou, 215004, China

    Enwei Qin, Song Yin, Hua Ji, Qian Huang, Zekun Liu & Shuhui Wu

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  1. Enwei Qin
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  2. Song Yin
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  3. Hua Ji
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  5. Zekun Liu
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Correspondence to Enwei Qin.

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Qin, E., Yin, S., Ji, H. et al. Hot Corrosion Behavior of Arc-Sprayed Highly Dense NiCr-Based Coatings in Chloride Salt Deposit. J Therm Spray Tech 26, 787–797 (2017). https://doi.org/10.1007/s11666-017-0549-2

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  • DOI: https://doi.org/10.1007/s11666-017-0549-2

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