ADONIS MARCELO SALIBA SILVA
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Resumo IPEN-doc 22471 The comparison of the corrosion resistance of advanced ferritic stainless steels by Mott-Schottky approach2009 - MARQUES, R.A.; TERADA, M.; SALIBA-SILVA, A.M.; PADILHA, A.F.; COSTA, I.Ferromagnetic stainless steels (SS) have been investigated as potential candidates for dental prosthesis applications in replacement of magnetic attachments made of noble and expensive alloys. In order to be used as biomaterials, their corrosion resistance has to be appropriate. The corrosion resistance of passive materials is related to the characteristics of the passive film formed and this property might be investigated by Mott-Schottky procedure. The capacitance of passive films formed during 2 days of immersion in a Phosphate Buffered Solution (PBS), at room temperature on PM2000, DIN 1.4575 and 17-4 PH ferritic stainless steels (SS) was studied by Mott-Schottky approach. A commercial alloy was also analyzed for comparison reasons. The results showed that films on tested materials behave as both, n-type and p-type semiconductors and the PM2000 presented the highest corrosion resistance among all materials studied.Artigo IPEN-doc 12480 A comparative study of the corrosion resistance of stainless steels obtained by powder metallurgy techniques for application in dental prosthesis2007 - MARQUES, R.A.; SALIBA SILVA, A.M.; ROGERO, S.O.; MONTEMOR, M.F.; COSTA, I.Artigo IPEN-doc 15911 A comparative study of the corrosion resistance of stainless steels obtained by powder metallurgy techniques for application in dental prosthesis2010 - MARQUES, R.A.; SALIBA SILVA, A.M.; ROGERO, S.O.; MONTEMOR, M.F.; COSTA, I.Ferromagnetic stainless steels (SS) produced by powder metallurgy (PM) techniques have been investigated as potential candidates for dental prosthesis applications in replacement of magnetic attachments made of noble and expensive alloys. Two SS were investigated: SS 17-4 PH produced by powder injection (PIM) and SS PM2000 obtained by mechanical alloying. In vitro cytotoxicity analysis of the two SS showed no cytotoxic effects. The magnetic retention force of both tested SS was also evaluated and they were comparable to noble commercially available material that is in use at the moment. The corrosion resistance of both SS was evaluated by electrochemical techniques in sodium phosphate buffer solution (PBS) at 37°C. The AISI 316L SS was also tested under the same conditions for comparison reasons. SS samples tested showed passive behaviour in the electrolyte, but they also presented susceptibility to pitting. The best pitting resistance was associated to the PM2000 whereas the 17-4PH PIM showed the highest pitting susceptibility among the tested steels. The results pointed out that the PM2000 SS might be considered a potential candidate for substitution of high cost magnetic alloys used in dental prosthesis.