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Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF

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Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF

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Título Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF
Autor Brandolt, Cristiane de Souza
Souza Júnior, Jair Garcia de
Kunst, Sandra Raquel
Ortega Vega, Maria Rita
Schroeder, Roberto Moreira
Malfatti, Célia de Fraga
Abstract The present study aimed to create and characterize niobium and niobium-iron60% coatings applied to steel API 5L X70 using the hypersonic thermal spray process (HVOF). The morphologies of the coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and profilometry, while the coatings’ hardnesses was evaluated using the Vickers hardness test. The coatings’ corrosion resistance was evaluated by monitoring their open circuit potential and potentiodynamic polarization and performing electrochemical impedance spectroscopy in a 0.05 M NaCl solution. The results showed that the niobium-iron coating contained minor porosity regions, while such defects occurred over large regions of the niobium coating. In terms of corrosion resistance, the coatings obtained in this work promoted a reduction in the substrate’s corrosion rate, but the presence of discontinuities such as porosity compromised the barrier effects of these coatings.
Contido em Materials research : ibero-american journal of materials. São Carlos. Vol. 17, n. 4 (jul./ago. 2014), p. 866-877
Assunto Aço
Aspersão térmica
Niobio
Resistência à corrosão
Revestimento
[en] API 5L X70 steel
[en] Coatings
[en] HVOF
[en] Niobium
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/115523
Arquivos Descrição Formato
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