Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/5064
Título: Anti-Corrosion performance of a new silane coating for corrosion protection of AZ31 Magnesium alloy in Hank’s solution
Autor: Zomorodian, A.
Brusciotti, F.
Fernandes, A.
Carmezim, M. J.
Silva, Maria Teresa Oliveira de Moura e
Fernandes, J. C. S.
Montemor, M. F.
Palavras-chave: AZ31 Mg Alloy
GPTMS Coating
Hank's Solution
Electrochemical Impedance Spectroscopy
Bioresorsable Materials
Data: Jul-2012
Editora: Elsevier Science
Citação: ZOMORODIAN, A.; [et al] – Anti-Corrosion performance of a new silane coating for corrosion protection of AZ31 Magnesium alloy in Hank’s solution. Surface & Coatings Technology. ISSN: 0257-8972. Vol. 206, nr. 21 (2012), pp. 4368-4375
Resumo: Mg alloys can be used as bioresorsable metallic implants. However, the high corrosion rate of magnesium alloys has limited their biomedical applications. Although Mg ions are essential to the human body, an excess may cause undesirable health effects. Therefore, surface treatments are required to enhance the corrosion resistance of magnesium parts, decreasing its rate to biocompatible levels and allowing its safe application as bioresorbable metallic implants. The application of biocompatible silane coatings is envisaged as a suitable strategy for retarding the corrosion process of magnesium alloys. In the current work, a new glycidoxypropyltrimethoxysilane (GPTMS) based coating was tested on AZ31 magnesium substrates subjected to different surface conditioning procedures before coating deposition. The surface conditioning included a short etching with hydrofluoric acid (HF) or a dc polarisation in alkaline electrolyte. The silane coated samples were immersed in Hank's solution and the protective performance of the coating was studied through electrochemical impedance spectroscopy (EIS). The EIS data was treated by new equivalent circuit models and the results revealed that the surface conditioning process plays a key role in the effectiveness of the silane coating. The HF treated samples led to the highest impedance values and delayed the coating degradation, compared to the mechanically polished samples or to those submitted to dc polarisation.
Peer review: yes
URI: http://hdl.handle.net/10400.21/5064
DOI: 10.1016/j.surfcoat.2012.04.061
ISSN: 0257-8972
Aparece nas colecções:ISEL - Eng. Mecan. - Artigos

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