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Corrosion Resistance of VC–FeCr and VC–FeCrСо Coatings Obtained by Supersonic Gas-Flame Spraying

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We study coatings of the VC–FeCr system with a thickness of 100 μm on a substrate of D16 aluminum alloy deposited by the method of supersonic gas-flame spraying (High Velocity Oxygen Fuel Flame Spraying Process; propane–oxygen fuel). For comparison, we apply the method of plasma spraying of coatings in a dynamic vacuum guaranteeing the highest quality of gas-thermal coatings. The powders for spraying were produced by the method of mechanical alloying with the use of a planetary mill. As initial components, we used powders of vanadium carbide, ferrochrome, and a cobalt–nickel alloy. We evaluate the corrosion-electrochemical properties of the coatings in a 3% NaCl solution at a temperature of 20 ± 0.2°С and show that they are characterized by high corrosion resistances, which correlates with their porosity. As a result of long-term holding of samples with coatings in a 3% NaCl solution, we observe the penetration of the corrosive medium to the coating–substrate interface, which may lead to underfilm corrosion and exfoliation of the coating. It is shown that a VC–FeCrCo coating whose porosity does not exceed 0.5% obtained by the plasma method in a dynamic vacuum has the lowest corrosion resistance. Its corrosion currents are twice weaker than for the coating obtained by the HVOF method.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian National Academy of Sciences, Lviv, Ukraine

    М. М. Student, Kh. R. Zadorozhna, H. H. Veselivs’ka, V. М. Hvozdets’kyi & Ya. Ya. Sirak

  2. “L’vivs’ka Politekhnika” National University, Lviv, Ukraine

    H. V. Pokhmurs’ka

Authors
  1. М. М. Student
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  2. H. V. Pokhmurs’ka
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  3. Kh. R. Zadorozhna
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  4. H. H. Veselivs’ka
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  5. V. М. Hvozdets’kyi
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  6. Ya. Ya. Sirak
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Correspondence to М. М. Student.

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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 54, No. 4, pp. 82–87, July–August, 2018.

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Student, М.М., Pokhmurs’ka, H.V., Zadorozhna, K.R. et al. Corrosion Resistance of VC–FeCr and VC–FeCrСо Coatings Obtained by Supersonic Gas-Flame Spraying. Mater Sci 54, 535–541 (2019). https://doi.org/10.1007/s11003-019-00214-1

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  • DOI: https://doi.org/10.1007/s11003-019-00214-1

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