Monitoring the electrochemical behavior of hybrid coatings on magneto-elastic sensors using resonant frequency variations

• Autor(a) principal: Beltrami, Lílian Vanessa Rossa
• Data de Publicação: 2021
• Outros Autores: Beltrami, Mateus, Missell, Frank Patrick, Kunst, Sandra Raquel, Birriel, Eliena Jonko, Malfatti, Célia de Fraga
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRGS
• Texto Completo: http://hdl.handle.net/10183/223343
• topic: Revestimentos protetores; Sensores magnéticos; Comportamento eletroquímico; Electrochemical behavior; Resonance frequency; Electrochemical impedance spectroscopy; Magnetoelastic sensor; Hybrid coating; Corrosion

In this work we present results for the protective performance of coatings used on magneto-elastic ribbons. It is found that monitoring the resonance frequency variation (Δf) of a magneto-elastic sensor can give useful electrochemical information. This method has the advantage of allowing one to monitor the electrochemical behavior of coatings without the need for direct access to the sample. A sensor developed from the FeNiMoB alloy (Metglas 2826MB3) was covered with hybrid coatings based on silicon alkoxide precursors. The results obtained from the magneto-elastic sensor test were correlated with the results obtained from electrochemical impedance spectroscopy (EIS). In general, it was observed that the Δf monitoring technique provided results consistent with those obtained by EIS, with the advantage that it does not need to have direct contact with the sample. Besides that monitoring the resonance frequency also allows one to evaluate the electrochemical behavior of the coating in the medium of interest.