OLANDIR VERCINO CORREA

OLANDIR VERCINO CORREA

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Corrosion characterization of AISI 304 stainless steel filter
2018 - BARBOSA, L.P.; CORREA, O.V.; KARSOKAS FILHO, N.; COSTA, I.
Pre-sintering for removal of lubricants is one of the most important steps in processing of powder metallurgy materials to achieve corrosion resistance. This is often the most neglected step in the sintering process. Incomplete removal of these organic compounds may result in sensitization of sintered parts. The aim of this study is to investigate the effect of lubricant removal process on the corrosion resistance of sintered AISI 304 L stainless steel filters. Pre-sintering was carried out at 450° C and sintering at 1150° C. As lubricant, 1% wax was used. The corrosion resistance of sintered samples was evaluated by polarization and tests, optical and scanning electron microscopy. The results showed that lubricant removal was not complete and during sintering sensitization of the stainless steel occurred decreasing the localized corrosion resistance of the stainless steel.
Study of the correlation between microstructure and corrosion resistance of the AZ91D magnesium alloy
2018 - ANTUNES, RENATO A.; OLIVEIRA, MARA C.L. de; FERRAZ, LUCAS C. de C.; GONCALES, LETICIA dos R.; CORREA, OLANDIR V.
The aim of the present work was to study the influence of beta phase precipitates content and distribution on the corrosion behavior of the AZ91D magnesium alloy, using samples subjected to solution annealing and aging. The morphology of the beta phase was observed using optical microscopy and scanning electron microscopy. The volume fraction of each phase was also determined. Potentiodynamic polarization tests and immersion tests were carried out, indicating an increase of the corrosion resistance with the volume fraction of the beta phase and its distribution on the grain boundaries of the alpha-phase. Solution annealed samples were more susceptible to corrosion.
Corrosion resistance of powder injection moulded AISI 316L and 17-4PH stainless steels in acid rain environments
2003 - SOBRAL, A.V.C.; FRANCO, C.V.; CORREA, O.V.; COSTA, I.
Corrosion and cytotoxicity evaluation of AISI 316L stainless steel produced by powder injection molding (PIM) technology
2005 - COSTA, I.; ROGERO, S.O.; CORREA, O.V.; KUNIOSHI, C.T.; SAIKI, M.
This study investigates the in vitro corrosion and cytotoxicity response of AISI 316L stainless steel produced by powder injection molding (PIM) technology in a solution that simulates physiological fluids (MEM) by electrochemical techniques and neutral red uptake cytotoxicity assay. The results were compared with those of AISI 316L produced by conventional metallurgy. Both steels showed high corrosion resistance and no toxic effect in the cytotoxicity test. The corrosion products were analyzed by instrumental neutron activation analysis (INAA). The surfaces of the alloys were evaluated before and after corrosion test by scanning electron microscopy and a passive behaviour was indicated supporting the results from other techniques.
TiG welding of sintered AISI 316 L stainless steel
2010 - NEVES, MAURICIO D.M. das; BARBOSA, LUZINETE P.; SILVA, LUIS C.E. da; CORREA, OLANDIR V.; COSTA, ISOLDA