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High-Temperature Oxidation and Corrosion Behaviour of APS CoCrAlY + Cr3C2–NiCr Composite Coating

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Abstract

An approach of chrome carbide-based composite coating entailing of hard phase (Cr3C2–NiCr) and matrix-CoCrAlY was tailored to encounter the severe environments such as elevated temperature oxidation, corrosion and erosion in gas turbine application. CoCrAlY +  Cr3C2–NiCr coating was deposited by atmospheric plasma spray process. Oxidation and hot corrosion tests were conducted under cyclic conditions in Na2SO4–V2O5 salt environment at 700 °C. The oxidation and hot corrosion behaviour base metal and coated samples were evaluated by thermogravimetric method. Scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and X-ray diffraction techniques were used to characterize the tested samples in terms of elemental and phase analysis. Microhardness of the composite coating is 318 ± 26 HV and the adhesion strength is found to be 11.5 ± 2.5 MPa. The uncoated alloys exhibited limited weight gain for the initial oxidation cycles followed by linear weight gain curve with the increasing in thermocycles. The CoCrAlY +  Cr3C2–NiCr coating experienced good corrosion resistance as compared to substrates- MDN 321 and Superni 76 at 700 °C. The coatings subjected to oxidation and hot corrosion showed slow-scale growth kinetics with parabolic rate constant (Kp) value of 0.4 and 0.053 10–10 g2 cm−4 s−1, respectively. The higher Cr content in the coating resulted in the growth of Cr2O3 and its spinel CoCr2O4 as a strong phase is beneficial for oxidation and corrosion resistance.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Malnad College of Engineering, Hassan, India

    H. S. Nithin

  2. Department of Mechanical Engineering, BGSIT, Adichunchanagiri University, Mandya, India

    K. M. Nishchitha

  3. School of Mechanical Engineering, REVA University, Bangalore, India

    V. Shamanth, K. Hemanth & K. Anand Babu

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  1. H. S. Nithin
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  2. K. M. Nishchitha
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  3. V. Shamanth
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Correspondence to H. S. Nithin.

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Nithin, H.S., Nishchitha, K.M., Shamanth, V. et al. High-Temperature Oxidation and Corrosion Behaviour of APS CoCrAlY + Cr3C2–NiCr Composite Coating. J Bio Tribo Corros 6, 28 (2020). https://doi.org/10.1007/s40735-020-0322-9

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  • DOI: https://doi.org/10.1007/s40735-020-0322-9

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