Resumo

MARZO, F.F. et al. Corrosion Behaviour of Fe/Co Based Amorphous Metallic Alloys in Saline Solutions: New Materials for GMI Based Biosensors. Port. Electrochim. Acta [online]. 2007, vol.25, n.1, pp.131-137. ISSN 0872-1904.

The objective of this investigation has been the study of corrosion resistance of Fe_2.5Co_64.5Cr₃Si₁₅B₁₅, Fe₃Co₆₇Cr₃Si₁₅B₁₂ and Fe₅Co₇₀Si₁₅B₁₀ amorphous metallic alloys obtained by the melt spinning technique, used as based materials to create a new type of giant magnetoimpedance (GMI) biosensor. The corrosion behaviour has been studied in phosphate buffered saline (PBS) solutions at pH 7.3 and 37.5 ºC. The electrochemical characterization of alloys has been made by means of DC techniques, obtaining the corrosion potential, pitting and protection potentials, as well as the perfect and imperfect passive regions of alloys. In this work, the experimental results obtained are discussed in order to study their corrosion behaviour in artificial biological solutions and thus determine their possible use as GMI-biosensor prototype materials.

Palavras-chave : giant magnetoimpedance (GMI); amorphous metallic alloys; pitting corrosion; biosensors.

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