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<p>Corrosion processes are always present in petrochemical industry operations. They occur in oil extraction and refining processes, where most operations involve acids or bases under high temperatures and pressures. Failures of these components occur mainly due to the degradation of the material by the corrosive environment, the presence of erodents, and the action of working temperatures between 650 and 760&#xa0;°C. This study evaluated the high-temperature corrosion behavior of Cr<sub>3</sub>C<sub>2</sub>-25NiCr and Cr<sub>3</sub>C<sub>2</sub>-25NiCrAlY coatings deposited by HVOF. Tests were conducted at 700&#xa0;°C in the presence of a 75% Na<sub>2</sub>SO<sub>4</sub> and 25% NaCl mixture. HVOF Cr<sub>3</sub>C<sub>2</sub>-25NiCr/NiCrAlY protective coatings were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) aided by energy dispersive spectroscopy (EDS) analysis, and Raman tests. The Cr<sub>3</sub>C<sub>2</sub>-25NiCrAlY coating exhibited a lower corrosion rate due to the formation of protective Al and Cr oxide layers, stabilized by Y. In contrast, the Cr<sub>3</sub>C<sub>2</sub>-25NiCr coating showed a more complex oxidation pathway with transient phases such as Cr<sub>2</sub>O<sub>5</sub>. Raman spectroscopy confirmed the presence of stable oxides in Cr<sub>3</sub>C<sub>2</sub>-25NiCrAlY, demonstrating its higher oxidation resistance. The results indicate that Cr<sub>3</sub>C<sub>2</sub>-25NiCrAlY is more effective in protecting against salt fusion corrosion, significantly reducing material degradation.</p>

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Hot Corrosion Behavior of Cr3C2-25NiCr/NiCrAlY HVOF Coatings

  • 期刊论文

  • 发表日期：

    2025年12月27日

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  • Giovanny Biava,
  • Irene Bida de Araujo Fernandez Siqueira,
  • Marcos Eduardo Soares,
  • Rodolpho Fernando Vaz,
  • Gelson Biscaia de Souza,
  • Hermano Cezar Medaber Jambo,
  • Edson Cezar Grzebielucka,
  • Anderson G. M. Pukasiewicz

摘要

Corrosion processes are always present in petrochemical industry operations. They occur in oil extraction and refining processes, where most operations involve acids or bases under high temperatures and pressures. Failures of these components occur mainly due to the degradation of the material by the corrosive environment, the presence of erodents, and the action of working temperatures between 650 and 760 °C. This study evaluated the high-temperature corrosion behavior of Cr3C2-25NiCr and Cr3C2-25NiCrAlY coatings deposited by HVOF. Tests were conducted at 700 °C in the presence of a 75% Na2SO4 and 25% NaCl mixture. HVOF Cr3C2-25NiCr/NiCrAlY protective coatings were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) aided by energy dispersive spectroscopy (EDS) analysis, and Raman tests. The Cr3C2-25NiCrAlY coating exhibited a lower corrosion rate due to the formation of protective Al and Cr oxide layers, stabilized by Y. In contrast, the Cr3C2-25NiCr coating showed a more complex oxidation pathway with transient phases such as Cr2O5. Raman spectroscopy confirmed the presence of stable oxides in Cr3C2-25NiCrAlY, demonstrating its higher oxidation resistance. The results indicate that Cr3C2-25NiCrAlY is more effective in protecting against salt fusion corrosion, significantly reducing material degradation.