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High-Temperature Corrosion Studies of HVOF-Sprayed Cr3C2-NiCr Coating on SAE-347H Boiler Steel

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Abstract

Cr3C2-NiCr coating was deposited on SAE-347H boiler steel by high velocity oxy fuel (HVOF) spray process. Subsequently, high-temperature corrosion behavior of the bare and coated boiler steel was investigated at 700 °C for 50 cycles in Na2SO4-82Fe2(SO4)3 molten salt, as well as air environments. Weight-change measurements after each cycle were made to establish the kinetics of corrosion. X-ray diffraction, field emission-scanning electron microscopy/energy dispersive spectroscopy, and x-ray mapping analyses were performed on the exposed samples to analyze the oxidation products. The bare 347H steel suffered accelerated oxidation during exposure at 700 °C in the air as well as the molten salt environment in comparison with its respective coated counterparts. The HVOF-spray Cr3C2-NiCr coating was found to be successful in maintaining its adherence in both the environments. The surface oxide scales were also found to be intact. The formation of chromium rich oxide scale might have contributed for the better hot corrosion/oxidation resistance in the coated steel.

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Acknowledgments

Harpreet Singh et al thankfully acknowledge the research grant from Department of Science and Technology, New Delhi (India) under SERC FAST Scheme (File No. SR/FTP/ETA-06/06, Dated March 16, 2006) to carry out this R & D work, titled “Development of Erosion-Corrosion Resistant Thermal Spray Coatings for Power Plant Boilers.”

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Authors and Affiliations

  1. Baba Banda Singh Bahadur Engineering College, Fatehgarh Sahib, India

    Manpreet Kaur

  2. Mechanical Engineering Department, Indian Institute of Technology, Ropar, Roopnagar, 140001, Punjab, India

    Harpreet Singh

  3. Indian Institute of Technology Roorkee, Roorkee, India

    Satya Prakash

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  1. Manpreet Kaur
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  2. Harpreet Singh
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  3. Satya Prakash
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Correspondence to Harpreet Singh.

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Kaur, M., Singh, H. & Prakash, S. High-Temperature Corrosion Studies of HVOF-Sprayed Cr3C2-NiCr Coating on SAE-347H Boiler Steel. J Therm Spray Tech 18, 619–632 (2009). https://doi.org/10.1007/s11666-009-9371-9

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