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Hot Corrosion Behaviour of Thermal-Sprayed TiO2-Reinforced Cr2O3 Composite Coatings on T-22 Boiler Steel at Elevated Temperature

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Abstract

In the present research work, hot corrosion behaviour of Cr2O3–wt%TiO2-reinforced coatings on ASME-SA213-T-22 boiler steel has been evaluated in the simulated boiler environment at a temperature of 800 ℃ under 50 cyclic thermal loading conditions. The TiO2 composition in Cr2O3 matrix was 10 and 20 wt%, and the coatings were developed by using high-velocity oxy-fuel thermal spray technique. Experiments were conducted under the molten salt environment of 40wt%Na2SO4–60wt%V2O5. The study was comparative due to variation in the composition of TiO2 content (10 and 20 wt%). The hot corrosion behaviour was studied by analysing weight change measurements, and corrosion products were analysed by SEM–EDS and XRD techniques. The Cr2O3–10wt%TiO2 and Cr2O3 20wt%TiO2 coatings were able to reduce the corrosion rate by 84.14% and 86.20%, respectively, in comparison to uncoated steel. The presence of TiO2 significantly decreased the corrosion rates. XRD peaks for Cr2O3–10wt%TiO2 and Cr2O3–20wt%TiO2 coatings showed TiO2 and Ti2O3 as major phases which are protective oxide layers. Increase in hot corrosion resistance was observed with increase in TiO2 content in Cr2O3 matrix.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Punjabi University Patiala, Patiala, Punjab, India

    Sahil, Sukhjinder Singh & Khushdeep Goyal

  2. Mechanical Egineering, Yadavindra College of Engineering, Talwandi Sabo, India

    Deepak Bhandari

  3. Applied Science Department, Yadavindra College of Engineering, Talwandi Sabo, India

    Bal Krishan

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  1. Sahil
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  2. Sukhjinder Singh
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  3. Khushdeep Goyal
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  4. Deepak Bhandari
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  5. Bal Krishan
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Correspondence to Khushdeep Goyal.

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Sahil, Singh, S., Goyal, K. et al. Hot Corrosion Behaviour of Thermal-Sprayed TiO2-Reinforced Cr2O3 Composite Coatings on T-22 Boiler Steel at Elevated Temperature. J Bio Tribo Corros 7, 100 (2021). https://doi.org/10.1007/s40735-021-00536-1

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  • DOI: https://doi.org/10.1007/s40735-021-00536-1

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