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<p>This work presents the development of cobalt-base/chromium/molybdenum/silicon superalloys coatings, by flame thermal spray on pipeline carbon steel substrates. The coatings were developed at 9 cm, 11 cm and 13 cm, to calibrate the most appropriate thermal spray distance, with the aim to obtain high-quality coatings. The microstructures, bonding, internal porosity and mechanical properties of the coatings were analyzed to stablish coatings properties. Energy-dispersive spectroscopy (EDS), x-rays diffraction and mapping analyses were performed to determine coating’s microstructure. Three-point bend tests of substrates coatings were performed to evaluate coating’s bonding properties and fracture behavior. The results showed good coating’s adhesion on steel substrates. Micro Vickers hardness tests were also performed to measure the hardness of the developed and high Vickers values were obtained, with scatter in all coating’s conditions. The results showed that the best thermal spray distance is 11 cm, to obtain high quality, along with other thermal spray parameters. At this thermal spray distance, the porosity and oxides were reduced; the lamellas were more consolidated, the hardness were less scattered. The coatings will be employed to protect oil and gas subsea production systems, against corrosion derived from the content of H<sub>2</sub>S and CO<sub>2</sub> in oil and gas.</p>

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Cobalt-Base/Molybdenum/Chromium/Silicon Superalloys Coatings on Pipeline Steel Substrates, Microstructural, Bonding and Mechanical Properties Characterization

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Ruben Cuamatzi-Meléndez,
  • Fernando Juárez-López,
  • Ángel de Jesús Morales-Ramírez,
  • Francisco Guillermo Rivas-Robles

摘要

This work presents the development of cobalt-base/chromium/molybdenum/silicon superalloys coatings, by flame thermal spray on pipeline carbon steel substrates. The coatings were developed at 9 cm, 11 cm and 13 cm, to calibrate the most appropriate thermal spray distance, with the aim to obtain high-quality coatings. The microstructures, bonding, internal porosity and mechanical properties of the coatings were analyzed to stablish coatings properties. Energy-dispersive spectroscopy (EDS), x-rays diffraction and mapping analyses were performed to determine coating’s microstructure. Three-point bend tests of substrates coatings were performed to evaluate coating’s bonding properties and fracture behavior. The results showed good coating’s adhesion on steel substrates. Micro Vickers hardness tests were also performed to measure the hardness of the developed and high Vickers values were obtained, with scatter in all coating’s conditions. The results showed that the best thermal spray distance is 11 cm, to obtain high quality, along with other thermal spray parameters. At this thermal spray distance, the porosity and oxides were reduced; the lamellas were more consolidated, the hardness were less scattered. The coatings will be employed to protect oil and gas subsea production systems, against corrosion derived from the content of H2S and CO2 in oil and gas.