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<p>Corrosion represents a significant contributor to the failure of metallic transmission pipelines and has a profound impact on the reliability and safety of coal-fired boilers. Numerous non-metallic coatings and evaluation methodologies have been investigated through various coating techniques to mitigate and minimize the effects of hot corrosion. Nevertheless, there remains a pressing need for the development of reliable, cost-effective, and environmentally sustainable corrosion mitigation strategies. Thermal metallic sprayed coatings have demonstrated considerable efficacy in preventing hot corrosion under authentic boiler conditions while maintaining a cost-effective profile. This research investigates the deposition of WC-Co-Cr coatings onto ASME SA213-T11 boiler steel via the High-Velocity Oxygen Fuel (HVOF) process. Furthermore, a burnishing process is employed post-deposition to enhance the coatings’ properties. Comprehensive characterization of both burnished and as-sprayed coated specimens was conducted utilizing optical metallography techniques. The investigation also encompassed assessments of microhardness and porosity. The HVOF spray technique enabled the fabrication of coatings characterized by high density and low porosity. The application of the burnishing process subsequent to the treatment resulted in a notable reduction of interconnected porosity within the coatings<b>.</b></p>

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RETRACTED ARTICLE: Evaluation of HVOF Sprayed and Burnished WC-Co-Cr Coatings on Boiler Steel: Mechanical and Microstructural Properties

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Atul Agnihotri,
  • Hitesh Vasudev,
  • Gurbhej Singh,
  • Suresh Singh,
  • Rajashekhar Hosalli,
  • G. Veeresha,
  • C. Durga Prasad,
  • Ranjith Balu,
  • Amit Tiwari

摘要

Corrosion represents a significant contributor to the failure of metallic transmission pipelines and has a profound impact on the reliability and safety of coal-fired boilers. Numerous non-metallic coatings and evaluation methodologies have been investigated through various coating techniques to mitigate and minimize the effects of hot corrosion. Nevertheless, there remains a pressing need for the development of reliable, cost-effective, and environmentally sustainable corrosion mitigation strategies. Thermal metallic sprayed coatings have demonstrated considerable efficacy in preventing hot corrosion under authentic boiler conditions while maintaining a cost-effective profile. This research investigates the deposition of WC-Co-Cr coatings onto ASME SA213-T11 boiler steel via the High-Velocity Oxygen Fuel (HVOF) process. Furthermore, a burnishing process is employed post-deposition to enhance the coatings’ properties. Comprehensive characterization of both burnished and as-sprayed coated specimens was conducted utilizing optical metallography techniques. The investigation also encompassed assessments of microhardness and porosity. The HVOF spray technique enabled the fabrication of coatings characterized by high density and low porosity. The application of the burnishing process subsequent to the treatment resulted in a notable reduction of interconnected porosity within the coatings.